# 接线图

# 树莓派管脚图

# 代码

# 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){ //when initialize wiring failed,print messageto screen
		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;
}

编译命令: gcc button.c -o button -lwiringPi

# Python

#!/usr/bin/env python
import RPi.GPIO as GPIO
BtnPin = 11
Gpin   = 12
Rpin   = 13
def setup():
	GPIO.setmode(GPIO.BOARD)       # Numbers GPIOs by physical location
	GPIO.setup(Gpin, GPIO.OUT)     # Set Green Led Pin mode to output
	GPIO.setup(Rpin, GPIO.OUT)     # Set Red Led Pin mode to output
	GPIO.setup(BtnPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)    # Set 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, 1)
		GPIO.output(Gpin, 0)
	if x == 1:
		GPIO.output(Rpin, 0)
		GPIO.output(Gpin, 1)
def Print(x):
	if x == 0:
		print '    ***********************'
		print '    *   Button Pressed!   *'
		print '    ***********************'
def detect(chn):
	Led(GPIO.input(BtnPin))
	Print(GPIO.input(BtnPin))
def loop():
	while True:
		pass
def destroy():
	GPIO.output(Gpin, GPIO.HIGH)       # Green led off
	GPIO.output(Rpin, GPIO.HIGH)       # Red led off
	GPIO.cleanup()                     # Release resource
if __name__ == '__main__':     # Program start from here
	setup()
	try:
		loop()
	except KeyboardInterrupt:  # When 'Ctrl+C' is pressed, the child program destroy() will be  executed.
		destroy()
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