/
ir.js
68 lines (59 loc) · 1.09 KB
/
ir.js
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gpio = require('rpi-gpio');
var pin = 11;
function waitToSettle(callback){
gpio.read(pin, function(err, result){
if(err){
console.log(err);
process.exit(1);
}
if(result)
waitToSettle(callback)
else
callback()
});
}
var listeners = [];
var running = false;
var current = false;
var previous = false;
function pollPIR(){
gpio.read(pin, function(err, result){
current = result;
if(current != previous){
toggleState();
}
if(running)
setTimeout(pollPIR, 0.01);
});
}
function toggleState(){
previous = !previous;
alertListeners();
}
function alertListeners(){
for(var i in listeners){
listeners[i](current);
}
}
module.exports = {
start: function(){
running = true;
gpio.setup(pin, gpio.DIR_IN, function(err) {
if(err){
console.error(err);
process.exit(1);
}
console.log("Pin setup. Waiting for the PIR to settle ....");
waitToSettle(pollPIR);
});
},
stop: function(){
running = false;
},
onChange: function(cb){
listeners.push(cb);
},
status: function(){
return current;
}
}