How to make a smart dustbin using Arduino?

Smart technology refers to devices and systems that use advanced computing, connectivity, and data analytics to enhance functionality and efficiency. Devices such as smartphones, watches, and appliances connect to the Internet and one another via the Internet of Things (IoT), allowing for real-time data exchange and remote control.

One innovative application of this technology is creating a smart dustbin. In this electronics project, we’ll design this dustbin using Arduino and an ultrasonic sensor to simplify waste disposal while contributing to a cleaner world.

How it works

The smart dustbin uses an ultrasonic sensor to detect the presence of an object (in this case, trash) within a certain range. If detected, the sensor triggers a mechanism, which opens the dustbin’s lid, allowing a user to dispose of the trash. This includes an element of automation, reducing the need for contact with the dustbin—for a cleaner way to discard trash.

Figure 1. Prototype of smart dustbin using Arduino and the ultrasonic sensor HC-SR04.

Materials

Arduino Uno
Ultrasonic sensor (HC-SR04)
Servo motor
Jumper wires
Power source (e.g., 9-V battery or a USB cable)
Dustbin with a lid

Step-by-step instructions

1. Setting up the hardware
Let’s start with the connections to the Arduino board.

Connect:

The ultrasonic sensor’s VCC pin with Arduino’s 5V pin
The ultrasonic sensor’s GND pin with Arduino’s GND pin
The ultrasonic sensor’s echo pin with Arduino’s digital pin 5
The ultrasonic sensor’s Trig pin with Arduino’s digital pin 5
The servo motor with Arduino via the signal wire to digital pin 7, VCC to 3V3, and GND to GND
The battery’s positive to the VIN and its negative to the GND

Figure 2. The circuit diagram.

Writing the code

The code involves reading data from the ultrasonic sensor and controlling the servo motor based on that data. Below is a simple example of the code to get you started.

Testing

Upload the code to Arduino and power it up. Ensure the ultrasonic sensor is properly positioned inside the dustbin and facing outwards. Throw an object (trash) within the detection range of the dustbin’s sensor. The dustbin’s lid should open automatically for trash disposal.

Conclusion

Building a smart dustbin using Arduino and an ultrasonic sensor is a useful project that combines electronics, programming, and practicality. This project can also be customized by adding features such as Bluetooth connectivity and voice commands or by integrating it into a larger home automation system.