Raspberry Pi GPIO Control

You may want to tried this C program  for remotely switching GPIO pins over SSH. It's for the same relay you are having. I will be glad if you can give me your thoughts about the program.

#include <wiringPi.h>

#include <ncurses.h>

#include <stdio.h>

#include <stdlib.h>

#include <stdint.h>

#include <stdbool.h>

int main (int argc, char *argv[]) {

char charIn;

int input;

int pinStatus[8] = {0};                              //Set all array elements = 0

int pinName[8] = {4,17,18,21,22,23,24,25};

int i;

int row;

int col;

int delay = 100;

if (wiringPiSetup() == -1) return(1);          //wiringPi initialisations

for (i = 0; i < 8; i++) {

pinMode(i,OUTPUT);                              //GPIO initialisations

}

if (argc == 2) delay = atoi(argv[1]);

if (argc > 2) {

printf("Invalid Arguements.\n");

return(2);

}

initscr();                                             //Initialise window

noecho();                                             //Don't echo keystroke onto the window

curs_set(0);                                        //hide cursor in terminal

timeout(delay);

while(charIn != 27) {                              //while ESC isn't pressed

clear();

getmaxyx(stdscr, row, col);

for (i = 0; i < 8; i++) {

mvprintw(row / 2 + i - 4,col/2 - 6, "GPIO%02d: %s\n", i ,(digitalRead(i))?"  ON":" OFF");

}

refresh();

charIn = getch();

input = charIn - 49;                         //get keypress data

if (input >= 0 && input < 8) {               // check if keypressed

switch ((digitalRead(input))) {

case 0:

digitalWrite(input,HIGH);

pinStatus[input] = 1;

break;

case 1:

digitalWrite(input,LOW);

pinStatus[input] = 0;

break;

}

}

}

clear();

refresh();

endwin();

return 0;

}

You may want to tried this C program  for remotely switching GPIO pins over SSH. It's for the same relay you are having. I will be glad if you can give me your thoughts about the program.

#include <wiringPi.h>

#include <ncurses.h>

#include <stdio.h>

#include <stdlib.h>

#include <stdint.h>

#include <stdbool.h>

int main (int argc, char *argv[]) {

char charIn;

int input;

int pinStatus[8] = {0};                              //Set all array elements = 0

int pinName[8] = {4,17,18,21,22,23,24,25};

int i;

int row;

int col;

int delay = 100;

if (wiringPiSetup() == -1) return(1);          //wiringPi initialisations

for (i = 0; i < 8; i++) {

pinMode(i,OUTPUT);                              //GPIO initialisations

}

if (argc == 2) delay = atoi(argv[1]);

if (argc > 2) {

printf("Invalid Arguements.\n");

return(2);

}

initscr();                                             //Initialise window

noecho();                                             //Don't echo keystroke onto the window

curs_set(0);                                        //hide cursor in terminal

timeout(delay);

while(charIn != 27) {                              //while ESC isn't pressed

clear();

getmaxyx(stdscr, row, col);

for (i = 0; i < 8; i++) {

mvprintw(row / 2 + i - 4,col/2 - 6, "GPIO%02d: %s\n", i ,(digitalRead(i))?"  ON":" OFF");

}

refresh();

charIn = getch();

input = charIn - 49;                         //get keypress data

if (input >= 0 && input < 8) {               // check if keypressed

switch ((digitalRead(input))) {

case 0:

digitalWrite(input,HIGH);

pinStatus[input] = 1;

break;

case 1:

digitalWrite(input,LOW);

pinStatus[input] = 0;

break;

}

}

}

clear();

refresh();

endwin();

return 0;

}