🚀 Pedro Project Repositories:

Each Pedro repository serves a specific role in the ecosystem:

• 📂 Pedro 3D Files: STL files for printing Pedro robot.
• 📂 Pedro Board: Gerber files, schematics, and PCB layouts for the Pedro controller board.
• 📂 Pedro Firmware: Firmware and library to program and control the Pedro robot.
• 📂 Pedro STEM Lessons: STEM lessons, activities, and teaching material using the Pedro robot for schools.

📂 Pedro Robot

Source code and library to program and control the Pedro robot. Available Control modes : Manual, Record & Replay, Bluetooth, Radio, UART and USB Serial.

⚙️ Installing and Uploading Pedro Firmware

1. Download and install the latest version of the Arduino IDE.
2. Install the required libraries from the Library Manager:
   • PedroRobot: Tools → Manage Libraries → search PedroRobot → Install
   • U8glib: Tools → Manage Libraries → search U8glib → Install
   • RF24: Tools → Manage Libraries → search RF24 → Install
3. Connect your Pedro robot to your computer via USB.
4. Select the correct port:
   • Tools → Select the port that appear when you connect Pedro robot
5. Select the board type:
   • Tools → Board → Arduino Micro
6. Open the example sketch:
   • File → Examples → PedroRobot → Pedro
7. Compile and upload the sketch to your Pedro board.

✅ Done! Your Pedro robot is now ready to run with the latest firmware.

Note: Make sure all dependencies are installed before compiling to avoid errors.

✨ Get Started with Pedro Control Modes

🎮 1. Manual Mode

What it does: Direct control of servo motors using onboard buttons.

How to use:

1. Power ON Pedro (default mode Manual)
2. Use button A0 to Select Servo.
3. Use button A1 to Move Servo to Left.
4. Use button A2 to Move Servo to Right.

🎓 STEM Insight: Learn about servo motors and direct PWM control.

🎥 2. Record & Replay Mode

What it does: Record servo movements, then replay them.

How to use:

1. Enter the Select Mode menu (hold button A0 for 4 seconds).
2. Choose Record Mode from the menu.
3. Press A0 to confirm.
4. Move Pedro manually using the buttons (as in Manual Mode).
5. Re-enter the Select Mode menu (hold A0 for 4 seconds).
6. Select Replay Mode.
7. Pedro will now repeat the recorded sequence in a loop.
8. To stop or change, re-enter the Select Mode menu.

🎓 STEM Insight: Teaches concepts of timing, sequencing, and automation.

📶 3. Bluetooth Mode (HC-05)

What it does: Control Pedro via smartphone (validate on Android devices).

How to use:

Configuring Pedro in Bluetooth Mode

1. Power OFF Pedro.
2. Set Pedro’s switch NRF → BT → WiFi to: BT.
3. Press and hold the BT → AT button.
4. Power ON Pedro.
5. Release the BT → AT button after 3 seconds.
6. Enter the Select Mode menu by holding A0 for 4 seconds).
7. Select BLUETOOTH Mode
8. Press A0 to confirm.
9. Select OK, then press A0 to confirm.
10. Pedro is now ready to communicate via Bluetooth.

Smartphone Application Setup:

1. Install the App: Download and install the Serial Bluetooth app on your smartphone.
2. Create the Control Buttons.

Button	Value	Mode	Action	Newline
Servo1	1	Text	Send	CR
Servo2	1	Text	Send	CR
Servo3	1	Text	Send	CR
Servo4	1	Text	Send	CR
FwD (Forward)	5	Text	Send	CR
BwD (Backward)	6	Text	Send	CR
Stop	7	Text	Send	CR

4. Pair your smartphone with Pedro’s HC-05 module (default name: HC-05, PIN: 1234).
5. Use the app buttons to send commands and control Pedro in real time.

✅ Once paired, use the buttons in the application to control Pedro in real time.

Optional: Change the Bluetooth Name

You can personalize Pedro's Bluetooth name.

1. Enter the Bluetooth Update menu.
2. Enter the new Bluetooth name (for example: PEDROROBOTX).
3. Save the new settings.
4. Pair your smartphone using the new Bluetooth device name.

🎓 STEM Insight: : Students learn about wireless serial communication and how to configure Bluetooth modules for embedded systems.

📡 4. Radio Mode (NRF24L01)

What it does: Enables remote communication between two Pedro robots or more using the NRF24L01 radio module.

How to use:

1. Insert the NRF24L01 module into the left slot of each Pedro board (one robot as transmitter, the other as receiver).
2. Set Pedro’s switch NRF → BT → WiFi to: NRF.
3. Enter the Select Mode menu (hold button A0 for 4 seconds).
4. Choose Radio Mode from the menu.
5. Press A0 to confirm.
6. Define the robot’s role (type): press A1 to select TRANSMITTER or RECEIVER.
7. Press A0 to confirm the role.
8. Set a communication Code Key:

• Press A1 to increase (increment).
• Press A2 to decrease (decrement).
• Values range from 1 to 99.

9. Press A0 to confirm the Code Key.
10. Press A0 again to validate (OK).

Note: Both the transmitter and receiver must use the same Code Key to establish communication.

🎓 STEM Insight: This mode introduces students to the basics of radio frequency communication, addressing concepts like transmitter/receiver pairing and unique channel codes.

🌐 5. USB Serial Mode

What it does: Control Pedro from your PC with Pedro-IHM.

How to use:

1. Enter the Select Mode menu (hold button A0 for 4 seconds).
2. Choose USB SERIAL MODE from the menu.
3. Press A0 to confirm.
4. Connect Pedro via USB cable.
5. Launch the web controller app.
6. Send commands & test servo response.

🎓 STEM Insight: Embedded programming and PC-robot communication.

🌐 6. UART Mode

What it does: UART Mode allows two Pedro robots to communicate through a wired serial connection using the RX and TX pins.

How to use: Wiring the Pedro Robots

Connect the pins of the Pedro Robots transmitter and receiver as following:

• Transmitter → Receiver
• TX → RX
• GND → GND
• VCC → VCC (option)

Important: Always connect TX → RX (never TX → TX).

Configuring the Pedro Transmitter and Receiver

Transmitter	Receiver
1. Power ON Pedro	1. Power ON Pedro
2. Enter the Select Mode menu	2. Enter the Select Mode menu
3. Select UART Mode	3. Select UART Mode
4. Press A0 to confirm	5. Press A0 to confirm
5. Press A1 to select the TRANSMITTER role	5. Press A1 to select the RECEIVER role
6. Press A0 to confirm	6. Press A0 to confirm
7. Select OK	7. Select OK
8. Press A0 to confirm	8. Press A0 to confirm

Ready to Communicate

✅ Once both robots are configured, use the A0, A1, and A2 buttons on the Pedro Transmitter to remotely control the Pedro Receiver through the UART (RX/TX) connection.

💡 Note: UART communication requires a wired connection between the two Pedro robots. Unlike Radio or Bluetooth modes, data is transmitted through the RX and TX pins rather than wirelessly.

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