'''

Voltaat Learn (http://learn.voltaat.com)

Link to the full tutorial:

Tutorial: How to use the Soil Moisture sensor with the Raspberry Pi Pico board.

This sketch turns on a pump when soil moisture is low.

Note: You can use this sketch with any Raspberry Pi Pico.

'''

from machine import Pin, ADC

import time

# Initialize ADC0 on GP26 (soil moisture sensor analog output)

soil_sensor = ADC(26)

# Initialize lamp/pump on GP16 as output

pump = Pin(16, Pin.OUT)

while True:

   # Read raw value (0 to 65535)

   raw_value = soil_sensor.read_u16()

   # Convert raw value to percentage (0–100),

   # we invert it because higher raw = dryer soil

   moisture = 100 - int((raw_value / 65535) * 100)

   print("Soil Moisture: {} %".format(moisture))

   # Condition: if soil is dry, turn on pump

   if moisture < 25:

       pump.value(1)  # Turn ON pump

   else:

       pump.value(0)  # Turn OFF

   time.sleep(0.5)

‍