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September 21, 2022 19:16
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Raspberry Pi Pico Python Scale Simulator & Button Interface
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| """ | |
| BEHOLD!!! | |
| A 'SCALE-Y' solution for the Python tinkerer masses! | |
| This should work on any Pi model with a little bit of tweaking to | |
| the GPIO pins. Read comments below for more information. | |
| Feel free to fork and contribute! | |
| """ | |
| from machine import Timer, Pin, PWM, UART, ADC | |
| from time import sleep | |
| # On Board LED Blink to show script activity | |
| led = Pin(25, Pin.OUT) | |
| # These GPIOs are wired to a Storm Interfaces 4 BUTTON SWITCH KEYPAD | |
| # https://www.storm-interface.com/pub/media/productattachments/files/File-1396359302.pdf | |
| btn_1_up = Pin(1, Pin.IN, Pin.PULL_UP) | |
| btn_2_down = Pin(5, Pin.IN, Pin.PULL_UP) | |
| btn_3_left = Pin(9, Pin.IN, Pin.PULL_UP) | |
| btn_4_right = Pin(13, Pin.IN, Pin.PULL_UP) | |
| timer = Timer() | |
| # Separate UART GPIO wired into a potentiometer to act as the scale's base. | |
| uart = UART(1,115200) | |
| adc = ADC(Pin(26)) | |
| def blink(timer): | |
| led.toggle() | |
| timer.init(freq=1, mode=Timer.PERIODIC, callback=blink) | |
| # Checks button state for each GPIO using ternary condition statements | |
| def button_pressed(btn_1_up, btn_2_down, btn_3_left, btn_4_right): | |
| b_list = [] | |
| UP = b_list.append("UP") if btn_1_up == 0 else None | |
| DOWN = b_list.append("DOWN") if btn_2_down == 0 else None | |
| LEFT = b_list.append("LEFT") if btn_3_left == 0 else None | |
| RIGHT = b_list.append("RIGHT") if btn_4_right == 0 else None | |
| if len(b_list) > 0: | |
| return b_list | |
| # Starts loop | |
| while True: | |
| button_state = button_pressed(btn_1_up.value(), btn_2_down.value(), btn_3_left.value(), btn_4_right.value()) | |
| if button_state != None: | |
| tare = -0.05 | |
| net = round((float(adc.read_u16()/65535))*100,2) | |
| gross = round(net + tare,2) | |
| data_str = f'[{{"tare":{tare},"net":{net},"gross":{gross},"actions":{button_state}}}]' | |
| uart.write(data_str) | |
| print(data_str) | |
| sleep(1) | |
| else: | |
| tare = -0.05 | |
| net = round((float(adc.read_u16()/65535))*100,2) | |
| gross = round(net + tare,2) | |
| data_str = f'[{{"tare":{tare},"net":{net},"gross":{gross},"actions":[]}}]' | |
| uart.write(data_str) | |
| print(data_str) | |
| sleep(1) |
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