Published August 11, 2018 © GPL3+

Google Home - Automatic Trash Can

"OK Google, open the trash!" By integrating obniz with Goole Home, your trash can will open/close automatically.

BeginnerFull instructions provided4 hours2,181

Things used in this project

Hardware components

Cambrian Robotics obniz

available at amazon.com

USB-A to Micro-USB Cable

Battery or USB adaptor & cable

Battery

Battery or USB adaptor & cable

Adafruit Servo motor

Trash can

Software apps and online services

Google Assistant SDK

IFTTT Maker service

Webhooks

Story

How It Works

You can open and close the trash can by just saying “OK Google, open/close the trash!” Google Home has already integrated with IFTTT. Also, IFTTT has Webhooks integration.

Obniz has a messaging API. It is simple and easy to send messages from any other web services to obniz. By adding Webbhooks to obniz on IFTTT, Google Home integration is a simple project.

Step 1: Setting Up obniz

To set up obniz, all you need to do is to follow three steps.

Connect obniz to WiFi.
Connect devices like LED or motors to obniz.
Scan QR code of obniz and start programming. You do not need to install any software.

Step 2

Connect the servo motor to the obniz as below.

io1: GND
io2: VCC
io3: Signal

Place the obniz and the servo motor to the trash can.

Step 3

Add Webhook on IFTTT.

Step 4

Write program in the program section and run it on HTML or Node.js.

What Is obniz?

obniz is a cloud-connected IoT development board. You can program on the web browser of any smartphone or computer and the command is sent to obniz through the internet via obniz cloud. By connecting the obniz to the cloud through wifi, users can remotely control devices that are physically connected to obniz.

obniz has 12 IO and WiFi-BLE module. It can be controlled through the APIs – REST or WebSocket API – on obniz cloud. Not only simple IO on/off but also UART, I2C, BLE etc can be used by remotely controlling obniz via internet. All you need to do to connect obniz is to input unique ID by scanning QR code. Complicated processes are done by obniz and its cloud. You can just start programming in HTML, browser and circuit have already been integrated. If you write a program to collect sensor values, you can make a chart of the values easily.

In terms of hardware, every IO can drive up to 1A with overcorrect protection, therefore high current demanding devices such as motors can be directly connected to obniz IO. GPIO and AD can be used on every IO. UART, SPI etc peripherals can be assigned to every IO.Even output voltage 3v/5v can be changed by software. Most electrical parts can be connected directly. Embedded parts such as switch, OLED display, and BLE are ready for use on program.

Program

<!-- HTML Example -->
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <script src="https://unpkg.com/obniz@1.9.1/obniz.js"></script>
</head>

<body>
<div id="obniz-debug"></div>
<br>
<div class="text-center">
  <h1> Talk with google home </h1>
</div>

<div id="text">
  <ul>
    <li>Open the trash</li>
    <li>Close the trash</li>
  </ul>
</div>

<script>

/* This will be over written on obniz.io webapp page */
var obniz = new Obniz("OBNIZ_ID_HERE");

obniz.onconnect = async function () {
  var servo = obniz.wired("ServoMotor", {gnd:0, vcc:1, signal:2});
  obniz.onmessage = function(message, from) {
    if(message === "googlehomeOpen"){
      obniz.display.clear();
      obniz.display.print("open the trash");
        servo.angle(80.0); 
    }
    if(message === "googlehomeClose"){
      obniz.display.clear();
      obniz.display.print("close the trash");
      servo.angle(0.0); 
    }
  };
}
    
</script>
</body>
</html>