pump.py

import time, datetime, calendar
from pytz import timezone

import requests, json
import RPi.GPIO as GPIO

Relay_Ch1 = 21
Relay_Ch2 = 26
Relay_Ch3 = 19
Relay_Ch4 = 13

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)

GPIO.setup(Relay_Ch1,GPIO.OUT)
GPIO.setup(Relay_Ch2,GPIO.OUT)
GPIO.setup(Relay_Ch3,GPIO.OUT)
GPIO.setup(Relay_Ch4,GPIO.OUT)

GPIO.output(Relay_Ch1,GPIO.HIGH)
GPIO.output(Relay_Ch2,GPIO.HIGH)
GPIO.output(Relay_Ch3,GPIO.HIGH)
GPIO.output(Relay_Ch4,GPIO.HIGH)

GPIO.output(Relay_Ch1,GPIO.LOW)
time.sleep(3)
GPIO.output(Relay_Ch1,GPIO.HIGH)
                            
time.sleep(2)
GPIO.output(Relay_Ch1,GPIO.LOW)
time.sleep(2)
GPIO.output(Relay_Ch2,GPIO.LOW)
time.sleep(2)
GPIO.output(Relay_Ch3,GPIO.LOW)
time.sleep(2)
GPIO.output(Relay_Ch4,GPIO.LOW)