I have a rainfall sensor which I've hooked to a Raspberry Pi Pico. My testing code is the following:
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from machine import Pin, disable_irq, enable_irq
import utime
rain_count=0
rain_sensor=Pin(7, Pin.IN, Pin.PULL_UP)
def a(p):
global rain_count
state=disable_irq()
utime.sleep_ms(50)
if p.value():
rain_count+=1
enable_irq(state)
rain_sensor.irq(handler=a,trigger=Pin.IRQ_FALLING)
while True:
print(rain_count)
utime.sleep(0.1)