Blink the Raspberry Pi Pico faster with heat.

heat_blink.py

def temperature_blink(temp_sensor, fahrenheit=True):
    # get 16 bit unsigned integer
    reading = temp_sensor.read_u16()
    # conversion factor from 3.3V battery
    to_volts = 3.3 / 65535
    # scale temperature
    ADC_voltage = reading * to_volts
    # approximate temperature (C)
    temperature = 27 - (ADC_voltage - 0.706) / 0.001721
    # optional temperature conversion (F)
    if fahrenheit:
        temperature = temperature * 9 / 5 + 32
    
    # print('{} V to {} {}'.format(ADC_voltage, temperature, 'F' if fahrenheit else 'C'))
    
    return temperature, ADC_voltage

def scale(voltage, v_min=0.693953, v_max=0.711163, w_min=0.011111, w_max=0.5):
    numerator = (w_max - w_min) * (voltage - v_min)
    denominator = v_max - v_min
    # linearly scale voltage to time
    return numerator / denominator + w_min

def main():
    # import pico functions
    from machine import ADC, Pin
    # import sleep function
    from utime import sleep
    
    # set led pin
    led = Pin(25, Pin.OUT)
    # temperature sensor GPIO pin
    temp_sensor = ADC(4)
    # temperature scale
    fahrenheit=True
    
    while True:
        temperature, voltage = temperature_blink(temp_sensor, fahrenheit)
        # determine how long to sleep from voltage
        time = scale(voltage)
        print('{} {}\t{} V\t{} s'.format(temperature, 'F' if fahrenheit else 'C', voltage, time))
        sleep(time)
        # toggle light
        led.toggle()

main()