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#
# Author: peppe8o
# Date: Oct 15th, 2022
# Version: 1.0
# blog: https://peppe8o.com

# Please rename to "main.py" this script if you want to run it witout a connected PC

from machine import ADC, Pin

# setup the Pulse Sensor reading pin
pulse=ADC(28)
led = Pin(25, Pin.OUT)

max_samples = 1000
short_average=15
long_average=100
beat_threshold=200
finger_threshold=2000
history = []

def finger_detected():
    avg_1=sum(history[-short_average:])/short_average
    avg_2=sum(history[-long_average:])/long_average
    if avg_1-avg_2 > beat_threshold:
        led.value(1)
    else:
        led.value(0)

# main program
while True:
    try:
        value=pulse.read_u16()
        history.append(value)
        history = history[-max_samples:]
        
        if max(history)-min(history) < finger_threshold:
            finger_detected()
        else:
            led.value(0)
            
    except OSError as e:
        machine.reset()