🔧 Components Used
🎯 Lesson Objective
In this lesson, students will understand:
• The hardware components required to build the Smart Dustbin
• The purpose of each component in the system
• How these components work together to create an automated system
This lesson introduces the hardware components used to build the Smart Dustbin project.
1️⃣ ESP32 Microcontroller
The ESP32 acts as the brain of the Smart Dustbin system.
It is responsible for:
🧠 Processing sensor data
⚙ Controlling the servo motor
📡 Executing the program logic
The ESP32 reads data from the ultrasonic sensor and sends commands to the servo motor to open or close the dustbin lid.
Because of its powerful processing capability and multiple input/output pins, the ESP32 is well suited for robotics and automation projects.
2️⃣ Ultrasonic Sensor (HC-SR04)
The HC-SR04 ultrasonic sensor is used to detect objects near the dustbin.
This sensor measures the distance between the sensor and an object using ultrasonic sound waves.
In this project:
📏 The sensor detects a hand approaching the dustbin.
When the distance becomes smaller than a certain value, the microcontroller recognizes that someone wants to use the dustbin.
The sensor then sends a signal to the ESP32 to trigger the lid-opening mechanism.
3️⃣ Servo Motor
The servo motor is responsible for opening and closing the dustbin lid.
Unlike normal motors that rotate continuously, servo motors rotate to specific angles.
In this project:
🔄 The servo motor rotates to open the lid when a hand is detected.
After a short delay, the servo motor rotates back to close the lid.
Servo motors are ideal for this task because they provide precise position control.
4️⃣ Jumper Wires
Jumper wires are used to connect all electronic components together.
These wires allow electrical signals and power to travel between components such as:
🔌 ESP32
🔎 Ultrasonic sensor
⚙ Servo motor
Different types of jumper wires are used depending on the connection type.
Proper wiring ensures that all components communicate correctly.
5️⃣ Power Supply
The system requires a power source to operate.
The ESP32 and other components can be powered using:
🔋 USB connection from a computer
🔋 Battery pack
🔋 External power supply
The power supply provides electrical energy needed for the microcontroller, sensors, and motors.
6️⃣ Dustbin Structure
The physical dustbin structure holds all the components.
The servo motor is attached to the lid mechanism so that it can open and close the dustbin.
The ultrasonic sensor is usually mounted near the top of the dustbin so it can detect a hand approaching the lid.
The placement of components should ensure proper detection and smooth lid movement.
7️⃣ How These Components Work Together
All the components in the system work together to create the automated dustbin.
The process works as follows:
1️⃣ The ultrasonic sensor detects a hand near the dustbin.
2️⃣ The sensor sends the distance data to the ESP32.
3️⃣ The ESP32 processes the sensor data.
4️⃣ If the hand is detected within a certain range, the ESP32 sends a signal to the servo motor.
5️⃣ The servo motor rotates and opens the lid.
6️⃣ After a short delay, the lid closes automatically.
This creates a simple but effective automation system.
🚀 What Happens Next
Now that you understand the components required for the Smart Dustbin project, the next step is to learn how these components are connected together in a circuit.