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Utopiah/rpi_redlight.js

Last active October 25, 2020 08:13
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rpi_redlight.js
//in crontab as @reboot node ~/Prototypes/blink_node_webserver/redlight.js
const express = require('express')
var Gpio = require('onoff').Gpio; //include onoff to interact with the GPIO
var YELLOW = new Gpio(4, 'out'); //use GPIO pin 4, and specify that it is output
var RED = new Gpio(21, 'out'); //use GPIO pin 4, and specify that it is output
var GREEN = new Gpio(26, 'out'); //use GPIO pin 4, and specify that it is output
var blinkInterval
const app = express()
app.get('/', function(req, res){
res.send(`
<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<a href=/start/red>
<div width=100% height=500px style=background-color:red>
<br><br><br><br>
</div>
</a>
<a href=/start/yellow>
<div width=100% height=500px style=background-color:yellow>
<br><br><br><br>
</div>
</a>
<a href=/start/green>
<div width=100% height=500px style=background-color:green>
<br><br><br><br>
</div>
</a>
</html>
`)
});
app.get('/start/yellow', function(req, res){
YELLOW.writeSync(1); //set pin state to 0 (turn LED off)
res.send(`
<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
red on <a href=/stop>stop</a>
`)
});
app.get('/start/red', function(req, res){
RED.writeSync(1); //set pin state to 0 (turn LED off)
res.send(`
<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
red on <a href=/stop>stop</a>
`)
});
app.get('/start/green', function(req, res){
GREEN.writeSync(1); //set pin state to 0 (turn LED off)
res.send(`
<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
green on <a href=/stop>stop</a>
`)
});
app.get('/stop', function(req, res){
RED.writeSync(0); //set pin state to 0 (turn LED off)
GREEN.writeSync(0); //set pin state to 0 (turn LED off)
YELLOW.writeSync(0); //set pin state to 0 (turn LED off)
res.redirect('/')
});
app.get('/shutdown', function(req, res){
RED.unexport(); // Unexport GPIO to free resources
GREEN.unexport(); // Unexport GPIO to free resources
YELLOW.unexport(); // Unexport GPIO to free resources
res.send("shutdown")
});
app.listen(8888, '0.0.0.0', _ => { console.log("Listening port8888")})
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