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index_dispenser.html
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index_dispenser.html
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<html>
<head>
<title>Candy Dispenser</title>
<meta property="og:description" content="Control the Candy Dispenser with Web Bluetooth" />
<meta property="og:image" content="images/nordic_icon_144.png"/>
<meta name="viewport" content="width=device-width, initial-scale=1" />
</head>
<body style="padding: 0 !important; margin: 0 !important">
<div style="background-color:#009cde; padding-top:10; padding-bottom:10 ">
<h1 style="color:#fff; display:flex; justify-content:center">CANDY DISPENSER</h1>
</div>
<div id="button" style="display:flex; justify-content:center; align-items:center; margin-top:50">
<input style="width:50%" type="image" id="connect" src="images/connect.png"/>
</div>
<div id="arrows" style="display:none; margin-top:50">
<div style="display:flex; justify-content:center; align-items:center">
<input style="width:50%" type="image" id="forward" src="images/givemecandy.png"/>
</div>
<div style="padding-top:40; padding-bottom:50">
<p align="center">Time remaining: <span id="timeout"></span></p>
</div>
<div id="disconnect" style="display:flex; justify-content:center; align-items:center; margin-top:50">
<input style="width:50%" type="image" id="connect" src="images/disconnect.png"/>
</div>
</div>
<pre id="log"></pre>
<script>
var isConnecting = false;
var isConnected = false;
var sInterval;
var sTimeout;
var sServer;
var sCharacteristic;
document.querySelector('#connect').addEventListener('click', connect);
document.querySelector('#disconnect').addEventListener('click', disconnectDevice);
document.querySelector('#forward').addEventListener('touchstart', function(e) { move(e, "forward"); });
document.querySelector('#forward').addEventListener('touchend', function(e) { stop(e); });
function log(text) {
document.querySelector('#log').textContent += text + '\n';
}
function setConnecting(connecting) {
isConnecting = connecting;
if (connecting) {
document.querySelector('#connect').src = "images/connecting.png";
} else {
document.querySelector('#connect').src = "images/connect.png";
}
}
function setConnected(connected) {
isConnected = connected;
if (connected) {
document.querySelector('#button').style.display = "none";
document.querySelector('#arrows').style.display = "block";
sTimeout = 30;
document.querySelector('#timeout').textContent = sTimeout;
sInterval = setInterval(function() {
sTimeout -= 1;
if (sTimeout <= 0) {
setConnected(false);
clearInterval(sInterval);
} else {
document.querySelector('#timeout').textContent = sTimeout;
}
}, 1000);
} else {
document.querySelector('#button').style.display = "flex";
document.querySelector('#arrows').style.display = "none";
sServer.disconnect();
}
}
function connect() {
'use strict';
if (!navigator.bluetooth) {
log('Web Bluetooth API is not available.\n' +
'Please make sure the Web Bluetooth flag is enabled.');
return;
}
if (isConnecting) {
log('Connecting. Please wait.');
return;
}
log('Requesting Bluetooth Device...');
setConnecting(true);
navigator.bluetooth.requestDevice({
filters: [{
services:['a6c31337-6c07-453e-961a-d8a8a41bf368']
}]
})
.then(device => {
connect2(device, 0);
})
.catch(error => {
setConnecting(false);
log(error);
});
}
function connect2(device, retryCount) {
'use strict';
device.gatt.connect()
.then(server => {
log('Got server');
sServer = server;
return server.getPrimaryService('a6c31337-6c07-453e-961a-d8a8a41bf368');
})
.then(service => {
log('Got service');
return service.getCharacteristic('a6c31338-6c07-453e-961a-d8a8a41bf368');
})
.then(characteristic => {
log('Got characteristic');
sCharacteristic = characteristic;
setConnecting(false);
setConnected(true);
})
.catch(error => {
log(error);
if (retryCount < 5) {
log('Retrying...');
connect2(device, retryCount + 1);
} else {
setConnecting(false);
}
});
}
function move(event, direction) {
log("move(" + event + ", " + direction + ")");
try {
switch (direction) {
case "forward":
sCharacteristic.writeValue(new Uint8Array([1, 0, 0, 0, 0, 0]));
break;
case "backward":
sCharacteristic.writeValue(new Uint8Array([0, 1, 0, 0, 0, 0]));
break;
case "left":
sCharacteristic.writeValue(new Uint8Array([0, 0, 1, 0, 0, 0]));
break;
case "right":
sCharacteristic.writeValue(new Uint8Array([0, 0, 0, 1, 0, 0]));
break;
case "up":
sCharacteristic.writeValue(new Uint8Array([0, 0, 0, 0, 1, 0]));
break;
case "down":
sCharacteristic.writeValue(new Uint8Array([0, 0, 0, 0, 0, 1]));
break;
}
event.preventDefault();
} catch (error) {
setConnected(false);
log(error);
}
}
function stop(event) {
log("stop(" + event + ")");
try {
sCharacteristic.writeValue(new Uint8Array([0, 0, 0, 0, 0, 0]));
event.preventDefault();
} catch (error) {
log(error);
}
}
function disconnectDevice(){
document.querySelector('#button').style.display = "flex";
document.querySelector('#arrows').style.display = "none";
sServer.disconnect();
log("Disconnected.");
}
</script>
</body>
</html>