Soil moisture.py

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# Author: peppe8o
# Blog: https://peppe8o.com
# Date: Mar 19th, 2022
# Version: 1.0

# import required modules
from machine import ADC, Pin
import utime

# use variables instead of numbers:
soil = ADC(Pin(26)) # Soil moisture PIN reference

#Calibraton values
min_moisture=0
max_moisture=65535

readDelay = 0.5 # delay between readings

while True:
    # read moisture value and convert to percentage into the calibration range
    moisture = (max_moisture-soil.read_u16())*100/(max_moisture-min_moisture) 
    # print values
    print("moisture: " + "%.2f" % moisture +"% (adc: "+str(soil.read_u16())+")")
    utime.sleep(readDelay) # set a delay between readings