Relay control nodejs raspberry pi

Need Help With My Project
1

Hey Everyone,

I’ve spent a few hours trying to get this to work looking at example code etc but not really getting anywhere.

When I execute the script the GPIO pin goes high but clicking V1 button does not toggle the pin. (not even if I set it in reverse in the Android App…)

Im connected to my Raspberry Pi via wifi and the connection is definitely ok.


var Blynk = require('blynk-library');
var Gpio = require('onoff').Gpio;
var door = new Gpio(17, 'out');

var AUTH = 'xxxxx';

var blynk = new Blynk.Blynk(AUTH);

var v1 = new blynk.VirtualPin(1);

// Sync State

blynk.on('connect', function() {
  console.log("Blynk ready.");
  blynk.syncAll();
});



v1.on('write', function() {
 if(door.readSync() == 0) {
    door.writeSync(1);
    }
 else {
     door.writeSync(0);
    }


function unexportOnClose() { //function to run when exiting program
  door.writeSync(0); // Turn LED off
  door.unexport(); // Unexport LED GPIO to free resources
}


});
2

I should also mention I have wiringpi installed:

$ gpio readall
 +-----+-----+---------+------+---+-Pi ZeroW-+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
 |   2 |   8 |   SDA.1 |   IN | 1 |  3 || 4  |   |      | 5v      |     |     |
 |   3 |   9 |   SCL.1 |   IN | 1 |  5 || 6  |   |      | 0v      |     |     |
 |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 0 | IN   | TxD     | 15  | 14  |
 |     |     |      0v |      |   |  9 || 10 | 1 | IN   | RxD     | 16  | 15  |
 |  17 |   0 | GPIO. 0 |  OUT | 1 | 11 || 12 | 0 | IN   | GPIO. 1 | 1   | 18  |
 |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |
 |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4   | 23  |
 |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5   | 24  |
 |  10 |  12 |    MOSI |   IN | 0 | 19 || 20 |   |      | 0v      |     |     |
 |   9 |  13 |    MISO |   IN | 0 | 21 || 22 | 0 | IN   | GPIO. 6 | 6   | 25  |
 |  11 |  14 |    SCLK |   IN | 0 | 23 || 24 | 1 | IN   | CE0     | 10  | 8   |
 |     |     |      0v |      |   | 25 || 26 | 1 | IN   | CE1     | 11  | 7   |
 |   0 |  30 |   SDA.0 |   IN | 1 | 27 || 28 | 1 | IN   | SCL.0   | 31  | 1   |
 |   5 |  21 | GPIO.21 |   IN | 1 | 29 || 30 |   |      | 0v      |     |     |
 |   6 |  22 | GPIO.22 |   IN | 1 | 31 || 32 | 0 | IN   | GPIO.26 | 26  | 12  |
 |  13 |  23 | GPIO.23 |   IN | 0 | 33 || 34 |   |      | 0v      |     |     |
 |  19 |  24 | GPIO.24 |   IN | 0 | 35 || 36 | 0 | IN   | GPIO.27 | 27  | 16  |
 |  26 |  25 | GPIO.25 |   IN | 0 | 37 || 38 | 0 | IN   | GPIO.28 | 28  | 20  |
 |     |     |      0v |      |   | 39 || 40 | 0 | IN   | GPIO.29 | 29  | 21  |
 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
 +-----+-----+---------+------+---+-Pi ZeroW-+---+------+---------+-----+-----+

and my node an npm versions are:

$ node -v
v6.9.5

$ npm --version
3.10.10
3

You don’t have any link between the function and the if condition… and I am unsure whether door.readSync() would work that way? (whatever that is referring too, perhaps your WiringPi reference?)

I typically have something like this, using param as the link (no, I don’t know the technical term :stuck_out_tongue: )…

// ----- RPi Reboot Command -----
var RPiReboot = new blynk.VirtualPin(20);  // Setup Reboot Button on V20

RPiReboot.on('write', function(param) {  // Watches for V20 Button
if (param == 1) {  // Runs the CLI command if the button on V20 is pressed
process.exec('sudo /sbin/shutdown -r', function (msg) { console.log(msg) });
}
});