working with LCD
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428ae10d18
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5
app.js
5
app.js
@ -2,12 +2,15 @@ const { Gpio } = require('onoff');
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const poll = require('./poll')
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const common = require('./libs/common')
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const globalVars = require('./libs/globalVars')
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const lcd = require('./libs/lcd')
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lcd.heading()
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// lcd.time()
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poll.setInterval
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const switchIn = new Gpio('17', 'in', 'both');
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switchIn.watch((err, value) => {
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switchIn.watch( async (err, value) => {
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if (err) {
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console.log('Error', err);
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}
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11
lcd.js
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11
lcd.js
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@ -0,0 +1,11 @@
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const LCD = require('raspberrypi-liquid-crystal');
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const lcd = new LCD(1, 0x27, 20, 4);
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lcd.beginSync();
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lcd.clearSync();
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lcd.printLineSync(0, 'Welcome to KWorld');
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lcd.printLineSync(1, ' then');
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lcd.printLineSync(2, 'This is line 3');
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lcd.printLineSync(3, 'This is line 4');
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22
libs/lcd.js
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22
libs/lcd.js
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@ -0,0 +1,22 @@
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const LCD = require('raspberrypi-liquid-crystal');
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const lcd = new LCD(1, 0x27, 20, 4);
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lcd.beginSync();
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module.exports = {
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heading: async () => {
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lcd.clearSync();
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lcd.printLineSync(0, 'MiGenie Hot Water')
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lcd.printLineSync(1, ' By Karl')
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},
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time: async () => {
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lcd.setCursorSync(10,2);
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lcd.printSync('time')
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},
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updateScreen: async (input) => {
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lcd.setCursorSync(3, 0);
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lcd.printLineSync(3, input)
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},
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}
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5
poll.js
5
poll.js
@ -6,6 +6,8 @@ const redLED = new Gpio('4', 'out');
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const blueLED = new Gpio('27', 'out')
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const greenLED = new Gpio('22', 'out')
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const lcd = require('./libs/lcd')
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setInterval(function () {
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var rest_options = {
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@ -29,11 +31,13 @@ setInterval(function () {
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let waterOn = data.waterOn
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globalVars.waterOn = waterOn
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if (waterOn === 'true') {
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lcd.updateScreen('Heating')
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redLED.writeSync(1)
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blueLED.writeSync(0)
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greenLED.writeSync(0)
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} else {
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lcd.updateScreen('Not Heating')
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blueLED.writeSync(1)
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redLED.writeSync(0)
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greenLED.writeSync(0)
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@ -44,6 +48,7 @@ setInterval(function () {
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// Report errors
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request.on('error', function (error) {
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lcd.updateScreen('Error')
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redLED.writeSync(0)
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blueLED.writeSync(0)
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greenLED.writeSync(1)
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24
public/index.html
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24
public/index.html
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@ -0,0 +1,24 @@
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<!DOCTYPE html>
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<html>
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<body>
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<h1>Control LED light</h1>
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<p><input type="checkbox" id="light"></p>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.3/socket.io.js"></script> <!-- include socket.io client side script -->
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<script>
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var socket = io(); //load socket.io-client and connect to the host that serves the page
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window.addEventListener("load", function(){ //when page loads
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var lightbox = document.getElementById("light");
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lightbox.addEventListener("change", function() { //add event listener for when checkbox changes
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socket.emit("light", Number(this.checked)); //send button status to server (as 1 or 0)
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});
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});
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socket.on('light', function (data) { //get button status from client
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document.getElementById("light").checked = data; //change checkbox according to push button on Raspberry Pi
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socket.emit("light", data); //send push button status to back to server
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});
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</script>
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</body>
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</html>
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45
webserver.js
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45
webserver.js
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@ -0,0 +1,45 @@
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var http = require('http').createServer(handler); //require http server, and create server with function handler()
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var fs = require('fs'); //require filesystem module
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var io = require('socket.io')(http) //require socket.io module and pass the http object (server)
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var Gpio = require('onoff').Gpio; //include onoff to interact with the GPIO
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var LED = new Gpio(4, 'out'); //use GPIO pin 4 as output
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var pushButton = new Gpio(17, 'in', 'both'); //use GPIO pin 17 as input, and 'both' button presses, and releases should be handled
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http.listen(8080); //listen to port 8080
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function handler (req, res) { //create server
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fs.readFile(__dirname + '/public/index.html', function(err, data) { //read file index.html in public folder
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if (err) {
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res.writeHead(404, {'Content-Type': 'text/html'}); //display 404 on error
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return res.end("404 Not Found");
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}
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res.writeHead(200, {'Content-Type': 'text/html'}); //write HTML
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res.write(data); //write data from index.html
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return res.end();
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});
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}
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io.sockets.on('connection', function (socket) {// WebSocket Connection
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var lightvalue = 0; //static variable for current status
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pushButton.watch(function (err, value) { //Watch for hardware interrupts on pushButton
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if (err) { //if an error
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console.error('There was an error', err); //output error message to console
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return;
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}
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lightvalue = value;
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socket.emit('light', lightvalue); //send button status to client
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});
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socket.on('light', function(data) { //get light switch status from client
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lightvalue = data;
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if (lightvalue != LED.readSync()) { //only change LED if status has changed
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LED.writeSync(lightvalue); //turn LED on or off
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}
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});
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});
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process.on('SIGINT', function () { //on ctrl+c
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LED.writeSync(0); // Turn LED off
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LED.unexport(); // Unexport LED GPIO to free resources
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pushButton.unexport(); // Unexport Button GPIO to free resources
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process.exit(); //exit completely
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});
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