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Smart garbage bin
Time of flight sensor mounted on the lid
With help from a tiny Time Of Flight sensor I am able to monitor the fill level of my IKEA kitchen bin. The BME688 environment sensor onboard Thingy53 is used to fetch the temperature and humidity inside the garbage bin.
Due to problems of enabling the STEMMA I2C port on my Thingy53, the Time Of Flight sensor did not initialize correctly. I think the solution to the problem is just a update to the boardfile.
Open the index.html file in Chrome and connect to the Smartbin sensor.
<!DOCTYPE html>
<html>
<head>
<title>Smartbin GUI</title>
<meta charset="utf-8">
<script>
const serviceUUID = 'a66d80ca-5390-11ed-bdc3-0242ac120002';
const optionalServicesUUID = [
"a66d80cb-5390-11ed-bdc3-0242ac120002",
"a66d80cc-5390-11ed-bdc3-0242ac120002",
"a66d80cd-5390-11ed-bdc3-0242ac120002"
];
//Smartbin
const smartbinServicesUUID = 'a66d80ca-5390-11ed-bdc3-0242ac120002';
const temperatureCharacteristicUUID = "a66d80cb-5390-11ed-bdc3-0242ac120002";
const humidityCharacteristicUUID = "a66d80cc-5390-11ed-bdc3-0242ac120002";
const pressureCharacteristicUUID = "a66d80cd-5390-11ed-bdc3-0242ac120002";
var bleDevice;
var bleServer;
var uiService;
var tempChar;
var humidityChar;
var pressureChar;
window.onload = function() {
document.querySelector('#connect').addEventListener('click', connect);
document.querySelector('#disconnect').addEventListener('click', disconnect);
};
function connect() {
if (!navigator.bluetooth) {
return log('Web Bluetooth API is not available in browser.');
}
log('=============================');
log('Requesting Bluetooth Device...');
// RequestDevice must be in click handler (or other user inited events)
navigator.bluetooth.requestDevice({
filters: [{
//services: [serviceUUID],
//optionalServices: optionalServicesUUID,
"name": "Smartbin"
}]
})
.then(device => {
bleDevice = device;
console.log({
Name: device.name,
Id: device.id,
UUIDs: device.uuids,
Device: device
});
log('Connected to device: ' + device.name);
return device.gatt.connect();
})
.then(server => {
bleServer = server;
log('Found Server', server);
})
.then(() => bleServer.getPrimaryService(smartbinServicesUUID))
.then(service => {
log('Found Smartbin service', service);
uiService = service;
})
.then(() => uiService.getCharacteristic(temperatureCharacteristicUUID))
.then(characteristic => {
log('Found temperature characteristic');
tempChar = characteristic;
return tempChar.startNotifications();
})
.then(() => {
log('Notifications for temperature enabled');
tempChar.addEventListener('characteristicvaluechanged', handleNotifyTemperature);
})
.then(() => uiService.getCharacteristic(humidityCharacteristicUUID))
.then(characteristic => {
log('Found humidity characteristic');
humidityChar = characteristic;
return humidityChar.startNotifications();
})
.then(() => {
log('Notifications for humidity enabled');
humidityChar.addEventListener('characteristicvaluechanged', handleNotifyHumidity);
})
.then(() => {
log('=========== READY ===========');
})
.catch(error => {
log('Connection Error: ' + error);
});
}
function disconnect() {
if (!bleDevice) {
log('No Bluetooth Device found...');
return;
}
log('Disconnecting from Bluetooth Device...');
if (bleDevice.gatt.connected) {
bleDevice.gatt.disconnect();
log('Bluetooth Device connected: ' + bleDevice.gatt.connected);
} else {
log('Bluetooth Device is already disconnected');
}
}
function handleNotifyTemperature(event) {
let temperatureValue = event.target.value;
const tempInteger = temperatureValue.getInt16(0, true);
const temperatureFloat = tempInteger/100
console.log("temperature:",temperatureFloat);
document.getElementById("tmp").innerHTML = temperatureFloat;
}
function handleNotifyHumidity(event) {
let humidityValue = event.target.value;
const humidityInteger = humidityValue.getInt16(0, true);
const humidityFloat = humidityInteger/10
console.log("humidity:",humidityFloat);
document.getElementById("hum").innerHTML = humidityFloat;
}
function handleNotifyPressure(event) {
let pressureValue = event.target.value;
const pressureInteger = pressureValue.getInt16(0, true);
const pressureFloat = pressureInteger/100
console.log("pressure:",pressureFloat);
document.getElementById("pre").innerHTML = pressureFloat;
}
function log(text) {
console.log(arguments);
const logElm = document.querySelector('#log');
logElm.textContent = text + '\n' + logElm.textContent;
}
</script>
</head>
<body>
<button id="connect">Connect</button>
<button id="disconnect">Disconnect</button>
<br/>
<br/>
<span>Temperature in garbage bin: <span id="tmp"></span> *C</span>
<br/>
<span>Humidity in garbage bin: <span id="hum"></span> %</span>
<br/>
<div><pre id="log"></pre></div>
</body>
</html>
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