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app.js
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app.js
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/**
* Module dependencies.
*/
var express = require('express'),
routes = require('./routes'),
sio = require('socket.io'),
gpio = require('pi-gpio'),
crypto = require('crypto'),
async = require('async'),
tank = {},
_leftMotorFront = 21,
_leftMotorBack = 23,
_rightMotorFront = 16,
_rightMotorBack = 18,
app = module.exports = express.createServer(),
io = sio.listen(app);
// Configuration
app.configure(function() {
app.set('views', __dirname + '/views');
app.set('view engine', 'jade');
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(app.router);
app.use(express.static(__dirname + '/public'));
});
app.configure('development', function() {
app.use(express.errorHandler({ dumpExceptions: true, showStack: true }));
});
app.configure('production', function() {
app.use(express.errorHandler());
});
// Routes
app.get('/', routes.index);
app.listen(3000);
console.log('Listening %d in %s mode', app.address().port, app.settings.env);
tank.initPins = function() {
async.parallel([
gpio.open(_leftMotorFront),
gpio.open(_leftMotorBack),
gpio.open(_rightMotorFront),
gpio.open(_rightMotorBack)
]);
};
tank.moveForward = function(){
async.parallel([
gpio.write(_leftMotorFront, 1),
gpio.write(_rightMotorFront, 1)
]);
};
tank.moveBackward = function(){
async.parallel([
gpio.write(_leftMotorBack, 1),
gpio.write(_rightMotorBack, 1)
]);
};
tank.turnLeft = function(){
gpio.write(_rightMotorFront, 1);
};
tank.turnRight = function(){
gpio.write(_leftMotorFront, 1);
};
tank.stopAllMotors = function(){
async.parallel([
gpio.write(_leftMotorFront, 0),
gpio.write(_leftMotorBack, 0),
gpio.write(_rightMotorFront, 0),
gpio.write(_rightMotorBack, 0)
]);
};
io.sockets.on('connection', function(socket) {
var pg = require('pg');
var conString = "postgres://ayoub:secret@localhost/pi";
var user;
pg.connect(conString, function(err, client, done) {
if(err) {
return console.error('error fetching client from pool', err);
}
// last user that make login
client.query('SELECT * FROM last_user', function(err, result) {
done();
if(err) {
return console.error('error running query', err);
}
user = result.rows[0].active_email;
});
socket.on('keydown', function(dir) {
switch(dir){
case 'up': {
var query = "INSERT INTO command VALUES('move forward', date_trunc('second', current_timestamp), '" + user + "')";
client.query(query, function(err, result) {
done();
if(err) {
return console.error('error running query', err);
}
});
tank.moveForward();
break;
}
case 'down': {
var query = "INSERT INTO command VALUES('move backward', date_trunc('second', current_timestamp), '" + user + "')";
client.query(query, function(err, result) {
done();
if(err) {
return console.error('error running query', err);
}
});
tank.moveBackward();
break;
}
case 'left': {
var query = "INSERT INTO command VALUES('move left', date_trunc('second', current_timestamp), '" + user + "')";
client.query(query, function(err, result) {
done();
if(err) {
return console.error('error running query', err);
}
});
tank.turnLeft();
break;
}
case 'right': {
var query = "INSERT INTO command VALUES('move right', date_trunc('second', current_timestamp), '" + user + "')";
client.query(query, function(err, result) {
done();
if(err) {
return console.error('error running query', err);
}
});
tank.turnRight();
break;
}
}
});
});
socket.on('keyup', function(dir){
tank.stopAllMotors();
});
});
tank.initPins();