The 5V Relay switch require that i have require around 52mA current to work properly.
- Raspberry pi max GPIO current with 5v Relay = ?
- Arduino pin 13 current with 5v Relay = 38.5mA
- Arduino pin 13 + 12 current with 5v Relay = 45 mA
- Arduino pin 13 + 12 + 2 current with 5v Relay = 47.3 mA ( This worked )
So Now i can use Arduino as a switch on/off. Also I needed this switching to be based on some external events. So I used Aurdino Pin 2 as INPUT pin and added one 2.7K ohm resistor to from pin2 to Ground.
int status = 0;
void setup() {
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(2, INPUT);
}
void loop() {
status = digitalRead(2);
if (status == HIGH) {
digitalWrite(13, HIGH);
digitalWrite(12, HIGH);
digitalWrite(8, HIGH);
}
else {
digitalWrite(13, LOW);
digitalWrite(12, L0W);
digitalWrite(8, LOW);
}
}Switch ON = 7PM
Switch OFF = 12AM
- added Cronjob on Raspberry Pi 4
0 19 * * * /usr/bin/python3.8 /opt/led.py on
0 0 * * * /usr/bin/python3.8 /opt/led.py onled.py
import RPi.GPIO as GPIO
from time import sleep
import sys
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(21, GPIO.OUT, initial=GPIO.LOW)
if sys.argv[1] == "on":
GPIO.output(21, GPIO.HIGH)
#print("on")
exit()
elif sys.argv[1] == "off":
GPIO.output(21, GPIO.LOW)
#print("off")
exit()
