Automated Plant Watering

auto_water.py

import time
import RPi.GPIO as GPIO

MOISTURE_SENSOR_PIN = 4
RELAY_PIN = 17

def setupPinOutput(pin):
	GPIO.setup(pin, GPIO.OUT)
	
def turnRelayOn(pin):
	GPIO.output(pin, 0)
	
def turnRelayOff(pin):
	GPIO.output(pin, 1)
	
def setupGPIO():
    GPIO.setmode(GPIO.BCM)

def setPinInput(pin):
    GPIO.setup(pin, GPIO.IN)

def readPin(pin):
    return GPIO.input(pin)

def main():
    setupGPIO()
    setPinInput(MOISTURE_SENSOR_PIN)
    setupPinOutput(RELAY_PIN)
    turnRelayOff(RELAY_PIN)
    
    while(True):
        reading = readPin(MOISTURE_SENSOR_PIN)
        if (reading):
                print('We need to water!')
                turnRelayOn(RELAY_PIN)
                time.sleep(30)
                turnRelayOff(RELAY_PIN)
                time.sleep(450)
        else:
            print('We do not need to water!')
            turnRelayOff(RELAY_PIN)
        time.sleep(30)

if __name__ == '__main__':
    main()