ADDED SOME EXTRA CODE
I would recommend using node.js for that:
var express = require("express");
var app = express();
var http = require("http").Server(app);
var path = require("path");
var io = require('socket.io')(http);
var SerialPort = require('serialport');
var gpio = require('rpio');
http.listen(3000);
var serialPort = new SerialPort.SerialPort("/dev/ttyAMA0", {
baudrate: 115200,
dataBits: 8,
parity: "none",
stopBits: 1,
flowControl: false
});
io.on('connection', function(socket){
console.log('Connected');
socket.on("WriteSerial:get",function(data){
var hex = new Buffer (data, "hex"); //be careful passing data
writeSerial(serialPort, hex);
io.emit("WriteSerial:response", "Data writen!");
});
socket.on("ReadGPIO:get",function(data){
var input = readPin(data.pin);
io.emit("ReadGPIO:response", input);
});
socket.on("WriteGPIO:get",function(data){
writePin(data.pin, data.time);
io.emit("WriteGPIO:response", "Set!");
});
socket.on("unWriteGPIO:get",function(data){
unwritePin(data);
io.emit("unWriteGPIO:response", "Set!");
});
}
app.use(express.static(path.join(__dirname, '/')));
app.get("/home",function(req,res,next){
res.sendFile(path.join(__dirname + "/index.html"));
});
function writeSerial (port, data) {
port.write(data, function(err) {
if (err) {
return console.log('Error on write: ', err.message);
} else {
console.log('Data written: ' + data);
}
});
}
function readPin(pin){
rpio.open(pin, rpio.INPUT);
var read = rpio.read(pin) ? 'high' : 'low';
return read;
}
function writePin(pin, timeInMs){
rpio.open(pin, rpio.OUTPUT, rpio.LOW);
rpio.write(pin, rpio.HIGH);
if (timeInMs > 0) {
setTimeout(function(){
rpio.write(pin, rpio.LOW);
}, timeInMs);
} //You can put 0 if You want it to be high until You shut it down
}
function unWritePin(pin){
if(readPin(pin) === 'high') {
rpio.write(pin, rpio.LOW);
} else {
console.log("Pin already low!");
}
}
Be sure You have instaled the node.js with right version. If not do this in terminal:
sudo apt-get remove nodered && sudo apt-get remove nodejs nodejs-legacy &&
curl -sL https://deb.nodesource.com/setup_4.x | sudo bash - && sudo
apt-get install -y nodejs
Make a folder 'server' in '/home/pi/', add server.js to it. Add code I provided to server.js. Open that folder with terminal:
cd /home/pi/server/
Afther that install all modules used on server:
sudo npm install express && sudo npm install http && sudo npm install path &&
sudo npm install socket.io && sudo npm install serialport --unsafe-perm &&
sudo npm install rpio --unsafe-perm
Now all we have to do is create client side part. In folder '/home/pi/server' create index.html file and add folder called 'js'. In folder 'js' add socket.io.js for client side which You can find in folder '/home/pi/server/node_modules/socket.io/node_modules/socket.io-client/'.
Include socket.io.js for client side into Your index.html like this:
<script type="text/javascript" src="js/socket.io.js" /></script>
Also add main.js file to 'js' folder where You will put Your javascript code in and include it to index.html:
<script type="text/javascript" src="js/main.js" /></script>
<script type="text/javascript" src="js/jquery.js" /></script>
I will not make any graphics for but some main.js code is here:
$(document).ready(function() {
var socket = io.connect('http://your_ip_address_rpi:3000');
$( "#myButton" ).click(function(){
io.emit("WriteSerial:get", $("#myTextHolder").val()); //"FAAF531C" this is string of hex, should be added some filter to pass error when char is not part of HEX!
});
$( "#myButton2" ).click(function(){
io.emit("WriteGPIO:get", {"pin" : $("#myPinHolder").val(), "time" : $("#myTimeHolder").val()})
}
To run server on RPI startup add 'sudo node /home/pi/server/server.js &' to '/etc/rc.local' before 'exit 0' with 'sudo nano' editor.
It will work really good on any device.
