Raspberry pie development relay control lamp

Relay wiring

 Relay principle  ： Give a high level  NO--->COM  otherwise  NO---X---COM

Raspberry pie io chart

 Relay  com and vcc  Pick up 3.3  That's it 
 Ensure that the power supply connected to the module is the same  

Code

#include <stdio.h>
#include <wiringPi.h>
#define INOUT GPIO 7

int main()
{
    
	int cmd;
	/* Initialize judgment */
	if (wiringPiSetup()==-1){
    
	printf(" Initial failure ！n"):
	return -2;
   }
	/* Mode selection */
	pinMode (INOUT GPIO,OUTPUT);
	/* The output is set high and does not engage */
	digitalWrite(INOUT GPIO,HIGH);

	while(1){
    
	printf("0 break >>>><く<1 through \n")
	
	scanf(" Number d",&cmd);
	getchar();// Complete an output and finally wrap 

	/* Get 1 Imbibition */
	if (cmd==1){
    
	digitalWrite (INOUT GPIO,LOW);
   }
	/* Get 0 Nonabsorbent */
	else if (cmd==0){
    
	digitalwrite(INOUT GPIO,HIGH);
   }
	/* Nothing returned -1*/
	else return -1;
	 
}
  return 0; 

}

 From the keyboard   obtain   To  0  clone  ssh  page    see   The state of the output 
 Get 0  Output 1 

gpio raedall   View pin distribution and status