Arduino

//Turns on and off a LED,when pressings button attach to pin7
/*****************************************/
const int keyPin = 7; //the number of the key pin
const int LedPin = 13; //the number of the led pin
/*****************************************/
void setup()
{
    pinMode(keyPin, INPUT);//initailize the key pin as input
    pinMode(LedPin, OUTPUT);//initialize the led pin
}
/********************************************/
void loop()
{
    boolean Value=digitalRead(keyPin);//read the state of key value
    //and check if the key is pressed
    //if it is,the state is HIGH
    if (Value==HIGH)
    {
        digitalWrite(LedPin,LOW);//Turn on the led
    }
    else
    {
        digitalWrite(LedPin,HIGH);//Turn off the led
    }
}
/*********************************************/

树莓派

C

#include <wiringPi.h>
#include <stdio.h>
#define BtnPin    0
#define Gpin    1
#define Rpin    2

void LED(char* color)
{
    pinMode(Gpin, OUTPUT);
    pinMode(Rpin, OUTPUT);
    if (color == "RED")
    {
        digitalWrite(Rpin, HIGH);
        digitalWrite(Gpin, LOW);
    }
    else if (color == "GREEN")
    {
        digitalWrite(Rpin, LOW);
        digitalWrite(Gpin, HIGH);
    }
    else
        printf("LED Error");
}

int main(void)
{
    if (wiringPiSetup() == -1){
            printf("setup wiringPi failed !");
            return 1;
    }
    pinMode(BtnPin, INPUT);
    LED("GREEN");
    while(1){
            if(0 == digitalRead(BtnPin)){
                    delay(10);
                    if(0 == digitalRead(BtnPin)){
                            LED("RED");
                            printf("Button is pressed\n");
                    }
            }
            else if (1 == digitalRead(BtnPin)){
                delay(10);
                if (1 == digitalRead(BtnPin)){
                        while(!digitalRead(BtnPin));
                        LED("GREEN");
                }
            }
    }
    return 0;
}

Python

#!/usr/bin/env python
import RPi.GPIO as GPIO
BtnPin = 11
Gpin = 12
Rpin = 13

def setup():
    GPIO.setmode(GPIO.BOARD)
    GPIO.setup(Gpin, GPIO.OUT)
    GPIO.setup(Rpin, GPIO.OUT)
    GPIO.setup(BtnPin, GPIO.IN, pull_up_down=GPIO.PUD_UP) #Set the BtnPin's mode is input, and pull up to high level(3.3V)
    GPIO.add_event_detect(BtnPin, GPIO.BOTH, callback=detect, bouncetime=200)

def Led(x):
    if x == 0:
        GPIO.output(Rpin, 0)
        GPIO.output(Gpin, 1)
    elif x == 1:
        GPIO.output(Rpin, 1)
        GPIO.output(Gpin, 0)

def screen_print(x):
    if x == 0:
        print('  *******************')
        print('  * Button Pressed! *')
        print('  *******************')

def detect(chn):
    Led(GPIO.input(BtnPin))
    screen_print(GPIO.input(BtnPin))

def loop():
    while True:
        pass

def destroy():
    GPIO.output(Gpin, GPIO.HIGH)
    GPIO.output(Rpin, GPIO.HIGH)
    GPIO.cleanup()


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