🔧 Components Used
🎯 Lesson Objective
In this lesson, students will understand:
• The hardware components required to build the Obstacle Avoiding Robot
• The function of each component in the robot system
• How these components work together to detect obstacles and control movement
This lesson introduces the electronic and mechanical components used in the Obstacle Avoiding Robot project.
1️⃣ ESP32 Microcontroller
The ESP32 acts as the main controller of the robot.
It performs the following tasks:
🧠 Reads distance data from the ultrasonic sensor
⚙ Processes the sensor values
🚗 Sends commands to the motor driver
📡 Executes the robot control program
When the ultrasonic sensor detects an object, the ESP32 calculates the distance and decides how the robot should move.
The ESP32 is widely used in robotics because it provides:
• Multiple input/output pins
• High processing capability
• Built-in WiFi and Bluetooth support
2️⃣ Ultrasonic Sensor (HC-SR04)
The HC-SR04 ultrasonic sensor is used to measure the distance between the robot and objects.
The sensor works by sending ultrasonic sound waves and measuring how long it takes for the sound to return.
The sensor has four pins:
• VCC → Power supply
• GND → Ground connection
• TRIG → Sends ultrasonic signal
• ECHO → Receives reflected signal
Using these signals, the ESP32 calculates the distance to the object.
The ultrasonic sensor is widely used in:
🚗 Car parking sensors
🤖 Obstacle avoiding robots
📏 Distance measurement systems
🏭 Industrial automation
3️⃣ L298N Motor Driver
The L298N motor driver controls the motors of the robot.
The ESP32 cannot directly power motors because motors require higher current.
The motor driver acts as an interface between:
🧠 ESP32 microcontroller
⚙ DC motors
The ESP32 sends control signals to the motor driver, and the motor driver provides the required power to the motors.
Using the motor driver, the robot can perform movements such as:
➡ Move forward
⬅ Move backward
↩ Turn left
↪ Turn right
🛑 Stop
4️⃣ DC Motors
The DC motors provide movement for the robot.
In this project, two motors are used:
• One motor for the left wheel
• One motor for the right wheel
By controlling these motors independently, the robot can change direction when an obstacle is detected.
DC motors are commonly used in robotics because they are simple and easy to control.
5️⃣ Robot Chassis
The robot chassis forms the physical structure of the robot.
It holds all components such as:
• ESP32
• Motor driver
• Motors
• Battery pack
• Ultrasonic sensor
The chassis also includes wheels and a caster wheel to help the robot move smoothly.
The ultrasonic sensor is usually mounted at the front of the robot to detect obstacles in its path.
6️⃣ Jumper Wires
Jumper wires are used to connect electronic components together.
They allow electrical signals to travel between:
🔌 ESP32
📏 Ultrasonic sensor
⚙ Motor driver
Proper wiring ensures that signals and power reach the correct components.
Loose connections may cause the robot to malfunction.
7️⃣ Power Supply
The robot requires a power source to operate.
Possible power sources include:
🔋 Lithium battery pack
🔋 Rechargeable batteries
🔋 External power supply
The power supply provides energy for:
⚙ Motors
🧠 ESP32
📏 Sensors
A stable power supply ensures reliable robot operation.
8️⃣ How the Components Work Together
All components in the Obstacle Avoiding Robot work together as a system.
The process works as follows:
1️⃣ The ultrasonic sensor measures the distance to objects in front of the robot.
2️⃣ The sensor sends the distance data to the ESP32.
3️⃣ The ESP32 processes the sensor value.
4️⃣ If an obstacle is detected, the ESP32 sends commands to the motor driver.
5️⃣ The motor driver controls the motors and changes the robot direction.
This allows the robot to detect obstacles and avoid them automatically.
🚀 What Happens Next
Now that you understand the components used in the Obstacle Avoiding Robot, the next step is to connect these components together.