Added a cover image

README.md

@@ -2,18 +2,20 @@
 
 A collection of programs run on a Raspberry Pi Pico to control a uv exposure unit (mainly used for exposing PCBs)
 
+![The front of the exposure unit](cover.png)
+
 
 ## Hardware
 
-This program is strongly customized to my needs, and my DIY exposure unit has **two buttons** and **one switch** to interact with the software (and a power switch FWIW). Also, a **16x2 display** (maybe 20x4 or others do also work, but these are not tested) can show information to the user.
+This software is strongly customized to my needs, and my DIY exposure unit has **two buttons** and **one switch** to interact with the software (and a power switch FWIW). Also, a **16x2 display** can show information to the user.
 A **relais** is used for switching all the LEDs.
 
 | Device Pin         | Pi Pico Pin |
 | ------------------ | ----------- |
-| BTN_1 Pin 1        | 3.3V        |
-| BTN_1 Pin 2        | GPIO15      |
-| BTN_2 Pin 1        | 3.3V        |
-| BTN_2 Pin 2        | GPIO14      |
+| BTN\_1 Pin 1       | 3.3V        |
+| BTN\_1 Pin 2       | GPIO15      |
+| BTN\_2 Pin 1       | 3.3V        |
+| BTN\_2 Pin         | GPIO14      |
 | SWITCH Pin 1       | 3.3V        |
 | SWITCH Pin 2       | GPIO13      | 
 | LCD SDA            | GPIO8       |
@@ -23,12 +25,12 @@ A **relais** is used for switching all the LEDs.
 | Relais control pin | GPIO21      |
 
 
-## Installation
+## Software installation
 
 To install this software on your Pi Pico, first clone the repository with `git clone --recurse-submodules` to populate the submodules also (some libraries are included as submodules). Then use [Thonny](https://thonny.org/), open all the files present in this repository and then save them onto a [Raspberry Pi Pico](https://www.raspberrypi.com/products/raspberry-pi-pico/) (or [Pico 2](https://www.raspberrypi.com/products/raspberry-pi-pico-2/), but it's not tested on this platform yet) running [MicroPython](https://micropython.org/). Then, given you followed above wiring, it should just be running! Then you can jump over the configuration section.
 
 
-## Configuration
+## First configuration
 
 All the configuration can be done in the [config.json](config.json) file in JSON format just have a look around there. Some hints for editing this file:
 
@@ -40,12 +42,14 @@ All the configuration can be done in the [config.json](config.json) file in JSON
 
 - If your display doesn't work properly - the first issue might be a wrong i2c address. To find the address of your display, just follow some of the tutorials on the internet on scanning for i2c devices (e.g. [here](https://randomnerdtutorials.com/raspberry-pi-pico-i2c-scanner-micropython/)).
 
+- The most basic configuration changes can be made directly from the device, without the need of connecting it to a PC, essentially making it a kind-of standalone device once flashed!
+
 
 ### Attribute table
 
 | Attribute name (on top level in config.json) | Type | Description | Default |
 | -------------------------------------------- | ---- | ----------- | ------- |
-| `"LOG_LEVEL"`                                | int  | defines up to which log level to show log messages in the serial console: warn (0), info (1), debug (2) | `2` |
+| `"LOG_LEVEL"`                                | int  | defines up to which log level to show log messages in the serial console: warn (0), info (1), debug (2) | `1` |
 | `"STARTUP_WELCOME_SHOW"`                     | bool | show the startup screen? | `true` | 
 | `"STARTUP_PROJECT_NAME"`                     | str  | the name shown at the welcome/startup screen | `"  UV-Belichter  "` |
 | `"STARTUP_MESSAGE_STARTING"`                 | str  | the message shown at startup when starting | `"Starting..."` |
@@ -59,8 +63,8 @@ All the configuration can be done in the [config.json](config.json) file in JSON
 | `"PIN_SCL"`                                  | int  | the pin number of the scl wire connected to the lcd | `9` |
 | `"LCD_I2C_CH"`                               | int  | the channel of the i2c bus used | `0` |
 | `"LCD_I2C_ADDR"`                             | int  | the i2c address of the lcd; make sure to convert hexadecimal to decimal numbers | `38` |
-| `"LCD_I2C_NUM\_ROWS"`                        | int  | how many rows for character display has the display? | `2` |
-| `"LCD_I2C_NUM\_COLS"`                        | int  | and how many characters can it display per row? | `16` |
+| `"LCD_I2C_NUM_ROWS"`                         | int  | how many rows for character display has the display? | `2` |
+| `"LCD_I2C_NUM_COLS"`                         | int  | and how many characters can it display per row? | `16` |
 | `"TIMER_1_DURATION"`                         | int  | the timer duration of the first timer; IN SECONDS | `60` (1min) |
 | `"TIMER_2_DURATION"`                         | int  | as above, but of the seconds timer; IN SECONDS | `2400` (40min) |
 | `"TIMER_3_DURATION"`                         | int  | as above, but of the third timer; IN SECONDS | `2700` (45min) |
@@ -104,6 +108,17 @@ So, as the `Config` class uses python's magic function for getting and setting a
 - [lcdMenu](https://git.privacynerd.de/BlueFox/lcdMenu) - used for the menus
 
 
+## Learning curve
+
+Here are some of the websites I learnt a lot from while programming this project - mainly here for documentation reasons.
+
+- [A handy guide into configuration files in json](https://bhave.sh/micropython-json-config/)
+- [The official micropython wiki page about the same topic](https://docs.micropython.org/en/latest/library/json.html)
+- [StackOverflow thread about how to format a json file (used by this project to make it a bit more readable)](https://stackoverflow.com/questions/16311562/python-json-without-whitespaces)
+- [A guide about magic functions for settings and getting attributes](https://staskoltsov.medium.com/python-magic-methods-to-get-set-attributes-716a12d0b106)
+- [The official guide into git submodules](https://git-scm.com/book/en/v2/Git-Tools-Submodules)
+
+
 ## License
 
 This project is licensed under GPL-3.0-or-later. See [LICENSE](LICENSE).

config.json

@@ -1,5 +1,5 @@
 {
-"LOG_LEVEL": 2,
+"LOG_LEVEL": 1,
 "STARTUP_WELCOME_SHOW": true, 
 "STARTUP_PROJECT_NAME":"  UV-Belichter  ", 
 "STARTUP_MESSAGE_STARTING": "Starting...",

demos/lcd_driver_demo.py

@@ -0,0 +1,64 @@
+"""
+An example "program" which can be used with the lcdMenu library on a 2x16 display (with some tweaks also on 4x20 displays)
+Copyright (C) 2024  Benjamin Burkhardt <bluefox@privacynerd.de>
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
+
+"""
+@ Feature:   Demonstrates the lcd driver's functionality 
+"""
+
+from time import sleep
+from utils import log
+
+# lcd is an object of the I2C_LCD class (https://git.privacynerd.de/BlueFox/micropython-libraries/src/branch/main/PCF8574T)
+def run(lcd):
+    # Show off basic functionality of the lcd driver
+    log(2, "Running the lcd driver demo")
+    
+    lcd.clear()
+    lcd.putstr("Driver demo".center(16)+"running...".center(16))
+    sleep(1)
+    lcd.clear()
+    lcd.putstr("Lorem ipsum     dolor sit amet")
+    sleep(1)
+    lcd.show_cursor()
+    sleep(1)
+    lcd.hide_cursor()
+    sleep(1)
+    lcd.blink_cursor_on()
+    sleep(1)
+    lcd.blink_cursor_off()
+    sleep(1)
+    lcd.backlight_off()
+    sleep(1)
+    lcd.backlight_on()
+    sleep(1)
+    lcd.display_off()
+    sleep(1)
+    lcd.display_on()
+    sleep(1)
+    lcd.clear()
+    sleep(1)
+    
+    s = ""
+    for x in range(32, 127):
+        s += chr(x)
+    while len(s) > 0:
+        lcd.clear()
+        lcd.move_to(0,0)
+        lcd.putstr(s[:32])
+        s = s[32:]
+        sleep(1)
+    lcd.clear()
+    return True
+
+if __name__ == "__main__":
+    import utils
+    run(utils.Config().LCD)

lib/lcdMenu

@@ -1 +1 @@
-Subproject commit 50e9b5211b7383f1b02f3e54db9eb76d42f11eb2
+Subproject commit 4b7e5723ca1c2d4b18e452561b2c5a025e489eb2

main.py

@@ -13,116 +13,50 @@ You should have received a copy of the GNU General Public License along with thi
 import utils
 from lcdMenu import lcdMenu
 from WelcomeScreen import WelcomeScreen
-from time import sleep, time_ns
 from gc import collect  # garbage collector for better memory performance
 
 config = utils.Config()
 btn_mapping = {"ok_btn": config.PIN_IN_BTN_1, "next_btn": config.PIN_IN_BTN_2}  # the btn mapping for all lcdMenus
 
-# extra functions to access the garbage collector
-def manual():
-    config.LCD.clear()
-    set_value = config.PIN_OUT_RELAIS.value()
-    config.LCD.putstr(f"---- MANUAL ----    State: {set_value}    ")
-    while True:
-        if set_value != config.PIN_IN_SWITCH.value():
-            config.PIN_OUT_RELAIS.value(config.PIN_IN_SWITCH.value())
-            set_value = config.PIN_OUT_RELAIS.value()
-            config.LCD.putstr(f"---- MANUAL ----    State: {set_value}    ")
-        if config.PIN_IN_BTN_1.value() == 1 or config.PIN_IN_BTN_2.value() == 1:
-            return True  # exit on press of these buttons; True to disable the Quitting message from lcdMenu
-def timer():
-    # display WIP
-    config.LCD.clear()
-    config.LCD.putstr("      Still     work-in-progress")
-    sleep(3)
-    return True  # disable the "Quitting" message from lcdMenu
-def uv_on():
-    config.PIN_OUT_RELAIS.value(1)
-    config.LCD.clear()
-    config.LCD.putstr("------ UV ------   turned on    ")
-    sleep(1)
-    return True  # disable the "Quitting" message from lcdMenu
-def uv_off():
-    config.PIN_OUT_RELAIS.value(0)
-    config.LCD.clear()
-    config.LCD.putstr("------ UV ------   turned off   ")
-    sleep(1)
-    return True  # disable the "Quitting" message from lcdMenu
-def lcd_big_hello():
-    import lcd_big_hello as lbh
-    lbh.run(config.LCD)
-    del lbh
-    collect()
-    return True
-def input_tests():
-    import input_tests as input_tests
-    input_tests.run(serial_output=False)
-    collect()
-    return True
-def settings():
-    settings_menu = lcdMenu(config.LCD, btn_mapping, scroll_direction=True, cycle=True, hide_menu_name=False, name="SETTINGS")
-    def swap_welcome():
-        config.STARTUP_WELCOME_SHOW = not config.STARTUP_WELCOME_SHOW
-        config.LCD.clear()
-        config.LCD.putstr(f" Welcome Screen ")
-        if config.STARTUP_WELCOME_SHOW:
-            config.LCD.putstr("--- Enabled! ---")
-        else:
-            config.LCD.putstr("--- Disabled ---")
-        sleep(1)
-    def welcome_cycles():
-        config.LCD.clear()
-        current_cycles = config.STARTUP_WELCOME_CYCLES
-        
-        option_down = [" ", "v"][current_cycles>1]
-        config.LCD.putstr(f"     Cycles     \n{option_down} {str(current_cycles).center(12)} ^")
-        while True:
-            if config.PIN_IN_BTN_1.value() == 1:
-                time_ns_when_pressed = time_ns()
-                while config.PIN_IN_BTN_1.value() == 1:
-                    if (time_ns() - time_ns_when_pressed) > 1000000000:  # if the time passed is longer than a second
-                        while config.PIN_IN_BTN_1.value() == 1:
-                            pass  # wait till release
-                        config.STARTUP_WELCOME_CYCLES = current_cycles
-                        return True
-                    sleep(0.05)
-                current_cycles -= 1
-                if current_cycles < 1: current_cycles = 1
-                option_down = [" ", "v"][current_cycles>1]
-                config.LCD.putstr(f"     Cycles     \n{option_down} {str(current_cycles).center(12)} ^")
-            if config.PIN_IN_BTN_2.value() == 1:
-                time_ns_when_pressed = time_ns()
-                while config.PIN_IN_BTN_2.value() == 1:
-                    if (time_ns() - time_ns_when_pressed) > 1000000000:  # if the time passed is longer than a second
-                        while config.PIN_IN_BTN_2.value() == 1:
-                            pass  # wait till release
-                        config.STARTUP_WELCOME_CYCLES = current_cycles
-                        return True
-                    sleep(0.05)
-                current_cycles += 1
-                option_down = [" ", "v"][current_cycles>1]
-                config.LCD.putstr(f"     Cycles     \n{option_down} {str(current_cycles).center(12)} ^")
-        
-    settings_programs = [("Show welcome", swap_welcome),
-                         ("Welcome cycles", welcome_cycles),
-                         ("Exit", settings_menu.stop)]
-    settings_menu.setup(settings_programs)  # give it the callback list
-    settings_menu.run()  # run the menu until it's closed
-    del settings_menu, settings_programs
-    collect()
-    return True
-def run_demo_menu():
-    demo_menu = lcdMenu(config.LCD, btn_mapping, scroll_direction=True, cycle=True, hide_menu_name=False, name="DEMOS")
-    demo_programs = [("LCD Demo", lcd_big_hello),
-                     ("Input tests", input_tests),
-                     ("Exit", demo_menu.stop)]
-    demo_menu.setup(demo_programs)  # give it the callback list
-    ret = demo_menu.run()
-    del demo_menu, demo_programs
-    collect()
-    return ret
 
+# extra functions to access the garbage collector
+def timers():
+        import programs.timers as t
+        t.run(config, btn_mapping, utils.log, lcdMenu)
+        del t
+        collect()
+        return True
+def manual():
+        import programs.manual as m
+        m.run(config)
+        del m
+        collect()
+        return True
+def demos():
+        import programs.demos as d
+        d.run(config, btn_mapping, utils.log, lcdMenu)
+        del d
+        collect()
+        return True
+def settings():
+        import programs.settings as s
+        s.run(config, btn_mapping, utils.log, lcdMenu)
+        del s
+        collect()
+        return True
+    
+# create the main menu
+main_menu = lcdMenu(config.LCD, btn_mapping, scroll_direction=True, cycle=True, hide_menu_name=False, name="PROGRAMS")
+main_programs = [("Timers", timers),
+                 ("Manual", manual),
+                 ("Demos", demos),
+                 ("Settings", settings)]
+main_menu.setup(main_programs)  # give it the callback list
+
+
+# -------
+
+# run the welcome screen as defined in the config file
 if config.STARTUP_WELCOME_SHOW:
     ws = WelcomeScreen(config.LCD,
                        interrupt_pins=[config.PIN_IN_BTN_1, config.PIN_IN_BTN_2, config.PIN_IN_SWITCH],
@@ -133,16 +67,5 @@ if config.STARTUP_WELCOME_SHOW:
     del ws
     collect()
 
-    
-# create the menus
-main_menu = lcdMenu(config.LCD, btn_mapping, scroll_direction=True, cycle=True, hide_menu_name=False, name="PROGRAMS")
-main_programs = [("Timer", timer),
-                 ("Manual", manual),
-                 ("UV off", uv_off),
-                 ("UV on", uv_on),
-                 ("Demos", run_demo_menu),
-                 ("Settings", settings)]
-main_menu.setup(main_programs)  # give it the callback list
-
 # and run the main menu (will be an endless loop)
 main_menu.run()

programs/demos.py

@@ -0,0 +1,52 @@
+"""
+uv-belichter-software - the DEMOS submenu
+Copyright (C) 2024  Benjamin Burkhardt
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
+from gc import collect
+
+# All the arguments this method takes are there for one reason: reduce the amount of libraries loaded into the picos memory and thus improving performance
+# config: utils.Config object
+# btn_mapping: a dict containing the btn mapping for the menu operation (given to the lcdMenu object)
+# log: the utils.log function
+# lcdMenu: the lcdMenu class (not an object of that class!)
+def run(config, btn_mapping, log, lcdMenu):
+    def lcd_driver_demo():
+        import demos.lcd_driver_demo as ldd
+        ldd.run(config.LCD)
+        del ldd
+        collect()
+        return True
+    def lcd_big_hello():
+        import demos.lcd_big_hello as lbh
+        lbh.run(config.LCD)
+        del lbh
+        collect()
+        return True
+    def input_tests():
+        import demos.input_tests as it
+        it.run(serial_output=False)
+        del it
+        collect()
+        return True
+    demo_menu = lcdMenu(config.LCD, btn_mapping, scroll_direction=True, cycle=True, hide_menu_name=False, name="DEMOS")
+    demo_programs = [("LCD Demo", lcd_driver_demo),
+                     ("Hello world", lcd_big_hello),
+                     ("Input tests", input_tests),
+                     ("Exit", demo_menu.stop)]
+    demo_menu.setup(demo_programs)  # give it the callback list
+    demo_menu.run()
+    return True
+
+if __name__ == "__main__":
+    from utils import Config, log
+    from lcdMenu import lcdMenu
+    config = Config()
+    btn_mapping = {"ok_btn": config.PIN_IN_BTN_1, "next_btn": config.PIN_IN_BTN_2}  # the btn mapping for all lcdMenus
+    run(Config(), btn_mapping, log, lcdMenu)

programs/manual.py

@@ -0,0 +1,28 @@
+"""
+uv-belichter-software - the MANUAL program (started from the main menu)
+Copyright (C) 2024  Benjamin Burkhardt
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
+def run(config):
+    config.LCD.clear()
+    set_value = config.PIN_OUT_RELAIS.value()
+    config.LCD.putstr(f"---- MANUAL ----    State: {set_value}    ")
+    while True:
+        if set_value != config.PIN_IN_SWITCH.value():
+            config.PIN_OUT_RELAIS.value(config.PIN_IN_SWITCH.value())
+            set_value = config.PIN_OUT_RELAIS.value()
+            config.LCD.putstr(f"---- MANUAL ----    State: {set_value}    ")
+        if config.PIN_IN_BTN_1.value() == 1 or config.PIN_IN_BTN_2.value() == 1:
+            return True  # exit on press of these buttons; True to disable the Quitting message from lcdMenu
+
+if __name__ == "__main__":
+    from utils import Config, log
+    config = Config()
+    btn_mapping = {"ok_btn": config.PIN_IN_BTN_1, "next_btn": config.PIN_IN_BTN_2}  # the btn mapping for all lcdMenus
+    run(Config(), btn_mapping, log)

programs/settings.py

@@ -0,0 +1,254 @@
+"""
+uv-belichter-software - the SETTINGS submenu
+Copyright (C) 2024  Benjamin Burkhardt
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
+from time import sleep, time_ns
+
+# All the arguments this method takes are there for one reason: reduce the amount of libraries loaded into the picos memory and thus improving performance
+# config: utils.Config object
+# btn_mapping: a dict containing the btn mapping for the menu operation (given to the lcdMenu object)
+# log: the utils.log function
+# lcdMenu: the lcdMenu class (not an object of that class!)
+def run(config, btn_mapping, log, lcdMenu):
+    settings_menu = lcdMenu(config.LCD, btn_mapping, scroll_direction=True, cycle=True, hide_menu_name=False, name="SETTINGS")
+    def toggle_show_welcome():
+        current_value = config.STARTUP_WELCOME_SHOW
+        config.LCD.clear()
+        config.LCD.putstr(f"Currently {'on' if current_value else 'off'}".center(16))
+        config.LCD.putstr("< keep  change >")
+        keep_btn = config.PIN_IN_BTN_1
+        change_btn = config.PIN_IN_BTN_2
+        while True:
+            if keep_btn.value() == 1:
+                config.LCD.move_to(0,1)  # move to the second row
+                config.LCD.putstr(f"Stay {'on' if current_value else 'off'}!".center(16))
+                sleep(0.5)
+                return True
+            if change_btn.value() == 1:
+                config.STARTUP_WELCOME_SHOW = not current_value
+                config.LCD.move_to(0,1)  # move to the second row
+                config.LCD.putstr(f"Turned {'on' if not current_value else 'off'}!".center(16))
+                sleep(0.5)
+                return True
+    def welcome_cycles():
+        config.LCD.clear()
+        current_cycles = config.STARTUP_WELCOME_CYCLES
+        
+        option_down = [" ", "v"][current_cycles>1]
+        config.LCD.putstr(f"     Cycles     \n{option_down} {str(current_cycles).center(12)} ^")
+        btn_left = config.PIN_IN_BTN_1
+        btn_right = config.PIN_IN_BTN_2
+        while True:
+            if btn_left.value() == 1:
+                sleep(0.1)  # this value is a good compromise between being able to press both buttons and a fast up/down speed
+                if btn_right.value() == 1:
+                    config.STARTUP_WELCOME_CYCLES = current_cycles
+                    config.LCD.move_to(0,1)  # move to the second row
+                    config.LCD.putstr(f"Saved!".center(16))  # show a little info that it is now set
+                    sleep(0.5)
+                    while btn_right.value() == 1 or btn_left.value() == 1:  # wait till both btns are released
+                        pass
+                    return True
+                
+                current_cycles -= 1
+                if current_cycles < 1: current_cycles = 1
+                option_down = [" ", "v"][current_cycles>1]
+                config.LCD.putstr(f"     Cycles     \n{option_down} {str(current_cycles).center(12)} ^")
+            if btn_right.value() == 1:
+                sleep(0.1)
+                if btn_left.value() == 1:
+                    config.STARTUP_WELCOME_CYCLES = current_cycles
+                    config.LCD.move_to(0,1)  # move to the second row
+                    config.LCD.putstr(f"Saved!".center(16))  # show a little info that it is now set
+                    sleep(0.5)
+                    while btn_right.value() == 1 or btn_left.value() == 1:  # wait till both btns are released
+                        pass
+                    return True
+                current_cycles += 1
+                option_down = [" ", "v"][current_cycles>1]
+                config.LCD.putstr(f"     Cycles     \n{option_down} {str(current_cycles).center(12)} ^")
+    
+    # with n being the number of the timer (starting at 0)
+    def set_n_timer(n: int):
+        # a small helper function to save the value of the n'th timer...
+        # as you can't programatically access TIMER_n_DURATION
+        def set_timer_helper(n, value):
+            if n == 0:
+                config.TIMER_1_DURATION = value
+            elif n == 1:
+                config.TIMER_2_DURATION = value
+            elif n == 2:
+                config.TIMER_3_DURATION = value
+            else:
+                log(0, "There are only 3 timers at all. Trying to set the timer number {n} failed.")
+                
+        config.LCD.clear()
+        timer_values = [config.TIMER_1_DURATION, config.TIMER_2_DURATION, config.TIMER_3_DURATION]
+        current_timer = timer_values[n]  # get the n'th timer
+        current_timer_div = lambda: divmod(current_timer, 60)
+        
+
+        config.LCD.putstr(f"Timer {n+1}".center(16))
+        config.LCD.putstr(f"{'v' if current_timer > 1 else ' '} " + f"{current_timer_div()[0]:02d}:{current_timer_div()[1]:02d}".center(12) + " ^")
+        btn_left = config.PIN_IN_BTN_1
+        btn_right = config.PIN_IN_BTN_2
+        left_was_released = True
+        right_was_released = True
+        while True:
+            if btn_left.value() == 1:
+                if left_was_released:
+                    time_press_start = time_ns()
+                    left_was_released = False
+                sleep(0.1)  # this value is a good compromise between being able to press both buttons and a fast up/down speed
+                if btn_right.value() == 1:  # exit if both btns are pressed
+                    set_timer_helper(n, current_timer)
+                    config.LCD.move_to(0,1)  # move to the second row
+                    config.LCD.putstr(f"Saved!".center(16))  # show a little info that it is now set
+                    sleep(0.5)
+                    while btn_right.value() == 1 or btn_left.value() == 1:  # wait till both btns are released
+                        pass
+                    return True
+                # define the step width
+                time_now = time_ns()
+                if (time_now - time_press_start) <= 1*(10**9):  # max. 1 seconds pressed
+                    current_timer -= 1
+                elif (time_now - time_press_start) <= 2*(10**9):  # max. 2 seconds pressed
+                    current_timer -= 5
+                elif (time_now - time_press_start) <= 3*(10**9):  # max. 3 seconds pressed
+                    current_timer -= 10
+                elif (time_now - time_press_start) <= 4*(10**9):  # max. 4 seconds pressed
+                    current_timer -= 30
+                elif (time_now - time_press_start) <= 5*(10**9):  # max. 5 seconds pressed
+                    current_timer -= 60
+                else:  # longer than 5s pressed
+                    current_timer -= 300
+                if current_timer < 1: current_timer = 5999
+                config.LCD.move_to(0,1)
+                config.LCD.putstr("v " + f"{current_timer_div()[0]:02d}:{current_timer_div()[1]:02d}".center(12) + " ^")
+            else:
+                left_was_released = True
+            if btn_right.value() == 1:
+                if right_was_released:
+                    time_press_start = time_ns()
+                    right_was_released = False
+                sleep(0.1)
+                if btn_left.value() == 1:  # exit if both btns are pressed
+                    set_timer_helper(n, current_timer)
+                    config.LCD.move_to(0,1)  # move to the second row
+                    config.LCD.putstr(f"Saved!".center(16))  # show a little info that it is now set
+                    sleep(0.5)
+                    while btn_right.value() == 1 or btn_left.value() == 1:  # wait till both btns are released
+                        pass
+                    return True
+                # define the step width
+                time_now = time_ns()
+                if (time_now - time_press_start) <= 1*(10**9):  # max. 1 seconds pressed
+                    current_timer += 1
+                elif (time_now - time_press_start) <= 2*(10**9):  # max. 2 seconds pressed
+                    current_timer += 5
+                elif (time_now - time_press_start) <= 3*(10**9):  # max. 3 seconds pressed
+                    current_timer += 10
+                elif (time_now - time_press_start) <= 4*(10**9):  # max. 4 seconds pressed
+                    current_timer += 30
+                elif (time_now - time_press_start) <= 5*(10**9):  # max. 5 seconds pressed
+                    current_timer += 60
+                else:  # longer than 5s pressed
+                    current_timer += 300
+                if current_timer > 5999: current_timer = 1
+                config.LCD.move_to(0,1)
+                config.LCD.putstr("v " + f"{current_timer_div()[0]:02d}:{current_timer_div()[1]:02d}".center(12) + " ^")
+            else:
+                right_was_released = True
+    def set_log_level():
+        config.LCD.clear()
+        current_level = config.LOG_LEVEL
+        log_levels = ["WARN", "INFO", "DEBUG"]
+        
+        config.LCD.putstr(f"Log level".center(16))
+        config.LCD.putstr("v " + f"{log_levels[current_level]} ({current_level})".center(12) + " ^")  # show the log level and it's name in the second row
+        btn_left = config.PIN_IN_BTN_1
+        btn_right = config.PIN_IN_BTN_2
+        while True:
+            if btn_left.value() == 1:
+                sleep(0.1)  # this value is a good compromise between being able to press both buttons and a fast up/down speed
+                if btn_right.value() == 1:
+                    config.LOG_LEVEL = current_level
+                    config.LCD.move_to(0,1)  # move to the second row
+                    config.LCD.putstr(f"Saved!".center(16))  # show a little info that it is now set
+                    sleep(0.5)
+                    while btn_right.value() == 1 or btn_left.value() == 1:  # wait till both btns are released
+                        pass
+                    return True
+                
+                current_level -= 1
+                if current_level < 0: current_level = 2
+                config.LCD.move_to(0,0)
+                config.LCD.putstr(f"Log level".center(16))
+                config.LCD.putstr("v " + f"{log_levels[current_level]} ({current_level})".center(12) + " ^")  # show the log level and it's name in the second row
+            if btn_right.value() == 1:
+                sleep(0.1)
+                if btn_left.value() == 1:
+                    config.LOG_LEVEL = current_level
+                    config.LCD.move_to(0,1)  # move to the second row
+                    config.LCD.putstr(f"Saved!".center(16))  # show a little info that it is now set
+                    sleep(0.5)
+                    while btn_right.value() == 1 or btn_left.value() == 1:  # wait till both btns are released
+                        pass
+                    return True
+                current_level += 1
+                if current_level > 2: current_level = 0
+                config.LCD.move_to(0,0)
+                config.LCD.putstr(f"Log level".center(16))
+                config.LCD.putstr("v " + f"{log_levels[current_level]} ({current_level})".center(12) + " ^")  # show the log level and it's name in the second row
+        
+    def reset():  # reset all user-settable configuration to the default values
+        config.LCD.clear()
+        config.LCD.putstr("Sure about that?")
+        config.LCD.putstr("< no       yes >")
+        no_btn = config.PIN_IN_BTN_1
+        yes_btn = config.PIN_IN_BTN_2
+        while True:
+            if no_btn.value() == 1:
+                return None
+            if yes_btn.value() == 1:
+                config.LCD.putstr("Resetting...".center(16))
+                config.LCD.putstr("Welcome Screen".center(16))
+                config.STARTUP_WELCOME_SHOW = True
+                config.STARTUP_WELCOME_CYCLES = 1
+                sleep(0.5)
+                config.LCD.move_to(0,1)
+                config.LCD.putstr("Timers".center(16))
+                config.TIMER_1_DURATION = 60
+                config.TIMER_2_DURATION = 2400
+                config.TIMER_3_DURATION = 2700
+                sleep(0.5)
+                config.LCD.move_to(0,1)
+                config.LCD.putstr("Logging".center(16))
+                config.LOG_LEVEL = 1
+                sleep(0.5)
+                return True
+            
+    settings_programs = [("Show welcome", toggle_show_welcome),
+                         ("Welcome cycles", welcome_cycles),
+                         ("Timer 1", lambda: set_n_timer(0)),
+                         ("Timer 2", lambda: set_n_timer(1)),
+                         ("Timer 3", lambda: set_n_timer(2)),
+                         ("Log level", set_log_level),
+                         ("Reset", reset),
+                         ("Exit", settings_menu.stop)]
+    settings_menu.setup(settings_programs)  # give it the callback list
+    settings_menu.run()  # run the menu until it's closed
+
+if __name__ == "__main__":
+    from utils import Config, log
+    from lcdMenu import lcdMenu
+    config = Config()
+    btn_mapping = {"ok_btn": config.PIN_IN_BTN_1, "next_btn": config.PIN_IN_BTN_2}  # the btn mapping for all lcdMenus
+    run(Config(), btn_mapping, log, lcdMenu)

programs/timers.py

@@ -0,0 +1,73 @@
+"""
+uv-belichter-software - the TIMER submenu
+Copyright (C) 2024  Benjamin Burkhardt
+
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+"""
+
+from time import sleep, time_ns
+
+# All the arguments this method takes are there for one reason: reduce the amount of libraries loaded into the picos memory and thus improving performance
+# config: utils.Config object
+# btn_mapping: a dict containing the btn mapping for the menu operation (given to the lcdMenu object)
+# log: the utils.log function
+# lcdMenu: the lcdMenu class (not an object of that class!)
+def run(config, btn_mapping, log, lcdMenu):
+    timer_menu = lcdMenu(config.LCD, btn_mapping, scroll_direction=True, cycle=True, hide_menu_name=False, name="TIMERS")
+    timer_values_original = [config.TIMER_1_DURATION, config.TIMER_2_DURATION, config.TIMER_3_DURATION]
+    timer_values = timer_values_original.copy()  # here, the current timers time is stored when interrupting via the interrupt_pin (see below)
+    timer_splits = [lambda: divmod(round(timer_values[0]), 60), lambda: divmod(round(timer_values[1]), 60), lambda: divmod(round(timer_values[2]), 60)]
+    interrupt_pin = config.PIN_IN_BTN_1  # the interrupt btn stops the timer, saves the current time and goes back to the menu
+    reset_pin = config.PIN_IN_BTN_2  # the reset btn restores the default value
+    start_stop_pin = config.PIN_IN_SWITCH  # the start_stop switch starts/stops the timer
+    
+    # timer_number is the number of the timer that will be run, starting at 1
+    # the _timer variable is needed because otherwise python will throw crazy errors regarding "variable accessed before assignment"...
+    # ...just see it as a copy of the timer_number-1'th elemnt of the timer_values list (see above)
+    def run_timer(timer_number: int, _timer: int):
+        config.LCD.clear()
+        config.LCD.putstr(f"Timer {timer_number}".center(16))
+        last_start_stop_value = start_stop_pin.value()
+        config.PIN_OUT_RELAIS.value(last_start_stop_value)
+        last_time_ns = time_ns()
+        while True:  # now run the timer (if the switch is high)
+            config.LCD.move_to(0,1)
+            _timer_div = divmod(round(_timer), 60)
+            config.LCD.putstr(f"{_timer_div[0]:02d}:{_timer_div[1]:02d}".center(16))
+            if interrupt_pin.value() == 1:
+                timer_values[timer_number-1] = _timer  # save the current state
+                last_start_stop_value = 0  # turn the LEDs off!
+                config.PIN_OUT_RELAIS.value(last_start_stop_value)
+                return None
+            if reset_pin.value() == 1:
+                _timer = timer_values_original[timer_number-1]  # reset the timers
+            if _timer <= 0:
+                config.PIN_OUT_RELAIS.off()
+                return True
+            sleep(0.05)
+            if last_start_stop_value != (new_value := start_stop_pin.value()):
+                last_start_stop_value = new_value
+                config.PIN_OUT_RELAIS.value(new_value)
+                last_time_ns = time_ns()
+            if start_stop_pin.value() == 1:
+                _timer -= (time_ns() - last_time_ns) / 1000**3
+                last_time_ns = time_ns()
+    
+    timer_programs = [(f"T1 - {timer_splits[0]()[0]:02d}:{timer_splits[0]()[1]:02d}", lambda: run_timer(1, timer_values[0])),
+                      (f"T2 - {timer_splits[1]()[0]:02d}:{timer_splits[1]()[1]:02d}", lambda: run_timer(2, timer_values[1])),
+                      (f"T3 - {timer_splits[2]()[0]:02d}:{timer_splits[2]()[1]:02d}", lambda: run_timer(3, timer_values[2])),
+                      ("Exit", timer_menu.stop)]
+    timer_menu.setup(timer_programs)  # give it the callback list
+    timer_menu.run()
+    return True  # disable the "Quitting" message from lcdMenu
+
+if __name__ == "__main__":
+    from utils import Config, log
+    from lcdMenu import lcdMenu
+    config = Config()
+    btn_mapping = {"ok_btn": config.PIN_IN_BTN_1, "next_btn": config.PIN_IN_BTN_2}  # the btn mapping for all lcdMenus
+    run(Config(), btn_mapping, log, lcdMenu)

utils.py

@@ -39,7 +39,10 @@ class Config:
                            "LCD_I2C_ADDR",              # the i2c adress of the display
                            "LCD_I2C_NUM_ROWS",          # how many rows for character display has the display?
                            "LCD_I2C_NUM_COLS",          # and how many characters can it display per row?
-                           "LCD"]                       # the actual lcd object (of the PCF8574T I2C_LCD class, see libraries)
+                           "LCD",                       # the actual lcd object (of the PCF8574T I2C_LCD class, see libraries)
+                           "TIMER_1_DURATION",          # the duration of the first timer in seconds
+                           "TIMER_2_DURATION",          # the duration of the second first timer in seconds
+                           "TIMER_3_DURATION"]          # the duration of the third timer in seconds
         self._config_file = config_file
         self.load_config()
     
@@ -128,6 +131,5 @@ def log(log_level: int, message: str):
     if log_level not in [0, 1, 2]:
         print(f"[LOGGER] Got a message of unknown log level ({log_level}). Original message is printed below.")
         print(f"{message}")
-    elif cfg.LOG_LEVEL >= log_level:  # if log level is valid
-        print(f"[{log_mapping[log_level]}] {message}")
-
+    elif Config().LOG_LEVEL >= log_level:  # if log level is valid
+        print(f"[{log_mapping[log_level]}] {message}")