Arduino

/****************************************************************
*name:Relay Module
*function: you may hear ticktock.That's the normally closed contact opened the the normally open contact closed.
**********************************************************************/

/*********************************************************************/
const int relayPin=7; //the "s" of relay module attach to
/********************************************************************/
void setup()
{
 pinMode(relayPin, OUTPUT); //Initialize relay as an output 
}
/**************************************************/
void loop()
{
 digitalWrite(relayPin, HIGH); //Close the relay
 delay(1000); //wait for 1 second
 digitalWrite(relayPin, LOW); //disconnect the relay\
 delay(1000); //wait for 1 second
}

树莓派

C

#include <wiringPi.h>
#include <stdio.h>
#define RelayPin 0
int main(void)
{
    if(wiringPiSetup() == -1){//when initialize wiring failded, print message to screen
                        printf("setup wiringPi failed !");
                        return 1;
        }
    pinMode(RelayPin,OUTPUT);
        while(1){
                        digitalWrite(RelayPin,LOW);
                        delay(1000);
                        digitalWrite(RelayPin,HIGH);
                        delay(1000);
        }
        return 0;
}

Python

#!/usr/bin/env python
import RPi.GPIO as GPIO
import time
RelayPin = 11 # pin11

def setup():
    GPIO.setmode(GPIO.BOARD)  #Numbers GPIOs by physical location
    GPIO.setup(RelayPin, GPIO.OUT)
    GPIO.output(RelayPin, GPIO.HIGH)

def loop():
    while True:
        print('relay on...')
        GPIO.output(RelayPin, GPIO.LOW)
        time.sleep(0.5)
        print('relay off...')
        GPIO.output(RelayPin, GPIO.HIGH)
        time.sleep(0.5)

def destroy():
    GPIO.output(RelayPin, GPIO.HIGH)
    GPIO.cleanup()       #release resource

if __name__ == '__main__':
    setup()
    try:
        loop()
    except KeyboardInterrupt:
        destroy()