🧪 Testing and Feature Options

🎯 Lesson Objective

In this lesson, students will learn:

• How to test the Voice Control Robot
• How to connect the smartphone to the ESP32 using Bluetooth
• How to verify that voice commands are received correctly
• How to troubleshoot common problems
• Additional features that can improve the robot

This lesson focuses on testing the voice control system and robot movement.

1️⃣ Checking the Hardware Setup

Before testing the robot, verify that all hardware connections are correct.

Check the following:

✔ ESP32 powered correctly
✔ Motor driver pins connected properly
✔ Motors connected to the correct terminals
✔ Battery polarity correct
✔ All components share a common ground

Incorrect wiring may prevent the robot from moving correctly.

Always verify the circuit before powering the robot.

2️⃣ Uploading the Program

To begin testing the robot:

1️⃣ Connect the ESP32 to the computer using a USB cable.
2️⃣ Open Arduino IDE.
3️⃣ Select the correct ESP32 board.
4️⃣ Select the correct COM port.
5️⃣ Upload the program.

Once the upload is complete, the ESP32 will start the Bluetooth system.

3️⃣ Connecting the Smartphone

Follow these steps to connect the phone to the robot.

1️⃣ Turn on Bluetooth on your smartphone.
2️⃣ Open the Bluetooth settings.
3️⃣ Search for available devices.
4️⃣ Find the device named:

ESP32_Voice_Robot

5️⃣ Pair with the device.

Once paired, the smartphone can send voice commands to the ESP32.

4️⃣ Using a Voice Control App

Students need a mobile app that can send voice commands through Bluetooth.

Common apps include:

📱 Arduino Voice Control App
📱 Bluetooth Voice Control App
📱 AMR Voice App

These apps allow the user to speak commands such as:

The app converts the voice command into text and sends it to the ESP32.

5️⃣ Testing Robot Movement

Once the phone is connected, test the robot movement.

Steps:

1️⃣ Open the voice control app.
2️⃣ Connect to ESP32_Voice_Robot.
3️⃣ Speak the command “Forward”.

Expected behavior:

➡ Robot moves forward.

Next test:

• Say Left → robot turns left
• Say Right → robot turns right
• Say Backward → robot moves backward
• Say Stop → robot stops

If the robot performs these actions correctly, the system is working.

6️⃣ Complete Robot Test

Now test the robot in a real environment.

Testing process:

1️⃣ Place the robot on the floor.
2️⃣ Connect the phone to the robot.
3️⃣ Use the voice control app to give commands.
4️⃣ Observe the robot responding to voice instructions.

This confirms that the Voice Control Robot is functioning correctly.

7️⃣ Troubleshooting Common Problems

Students may encounter some common issues.

Problem: Phone cannot find ESP32

Possible causes:

• Bluetooth not enabled on ESP32
• Program not uploaded correctly

Solution:

Restart ESP32 and re-upload the program.

Problem: Robot not responding to voice commands

Possible causes:

• Mobile app sending different text commands
• Incorrect command spelling

Solution:

Check the commands expected by the program:

forward
backward
left
right
stop

Problem: Robot moving in wrong direction

Possible cause:

Motor wires connected incorrectly.

Solution:

Swap the motor wires connected to the motor driver.

8️⃣ Improving the Voice Control Robot

Once the robot works successfully, additional features can be added.

Possible improvements include:

⚡ Adding PWM motor speed control
📱 Developing a custom mobile voice control app
💡 Adding LED indicators for robot status
📡 Adding WiFi control with voice assistants

These improvements make the robot more advanced and interactive.

9️⃣ Real-World Applications

Voice control technology is widely used in modern systems.

Examples include:

🏠 Smart home voice assistants
🚗 Voice-controlled vehicle systems
🤖 Service robots
🏭 Industrial automation systems

Voice control allows machines to be operated without physical interaction.

🚀 What Happens Next

Now that you have successfully built and tested the Voice Control Robot, the next project will introduce line-following robotics.