Circuit Documentation

Summary

This circuit integrates an Arduino Nano microcontroller with a variety of components to achieve a system capable of motor control, Bluetooth communication, and infrared sensing. The Arduino Nano serves as the central processing unit, interfacing with an HC-05 Bluetooth module for wireless communication, a 5-channel IR array for line or obstacle detection, and an L293 motor driver to control two DC Mini Metal Gear Motors. The circuit is powered by a 7.4V power source, which supplies power to the motor driver, IR array, Bluetooth module, and the Arduino Nano.

Component List

Arduino Nano

• Microcontroller board based on the ATmega328P
• Offers a variety of digital and analog I/O pins
• Used for controlling the logic of the entire circuit

L293 Motor Driver

• A motor driver IC capable of driving two DC motors
• Provides bidirectional drive currents
• Used for controlling the speed and direction of the motors

7.4V Power Source

• Provides the power supply for the circuit
• Used to power the motor driver, IR array, Bluetooth module, and Arduino Nano

5 Channel IR Array

• An array of infrared sensors
• Used for line tracking or obstacle detection
• Interfaces with the Arduino Nano for sensor data processing

HC-05 Bluetooth Module

• A wireless communication module
• Enables Bluetooth connectivity for the circuit
• Allows for remote control or data exchange with the Arduino Nano

DC Mini Metal Gear Motor (x2)

• Small, high-torque DC motors
• Used for driving the mechanical parts of the system

Wiring Details

Arduino Nano

• D1/TX connected to RXD on HC-05 Bluetooth Module
• D0/RX connected to TXD on HC-05 Bluetooth Module
• D2 connected to EN_B on L293 Motor Driver
• D3 connected to EN_A on L293 Motor Driver
• D4 connected to A1 on L293 Motor Driver
• D5 connected to A2 on L293 Motor Driver
• D6 connected to B2 on L293 Motor Driver
• D7 connected to B1 on L293 Motor Driver
• VIN connected to 7.4V Power Source +
• GND connected to 7.4V Power Source -
• A0 to A5 connected to corresponding A1 to A5 on 5 Channel IR Array

L293 Motor Driver

• EN_A and EN_B connected to Arduino Nano for motor enable signals
• A1, A2, B1, B2 connected to Arduino Nano for motor control signals
• MA1, MA2 connected to the first DC Mini Metal Gear Motor
• MB1, MB2 connected to the second DC Mini Metal Gear Motor
• VCC connected to 7.4V Power Source +
• GND connected to 7.4V Power Source -

7.4V Power Source

• + connected to VCC on L293 Motor Driver, VCC on 5 Channel IR Array, VIN on Arduino Nano, and VCC on HC-05 Bluetooth Module
• - connected to GND on L293 Motor Driver, GND on 5 Channel IR Array, GND on Arduino Nano, and GND on HC-05 Bluetooth Module

5 Channel IR Array

• A1 to A5 connected to corresponding A0 to A5 on Arduino Nano
• VCC connected to 7.4V Power Source +
• GND connected to 7.4V Power Source -

HC-05 Bluetooth Module

• RXD connected to D1/TX on Arduino Nano
• TXD connected to D0/RX on Arduino Nano
• VCC connected to 7.4V Power Source +
• GND connected to 7.4V Power Source -

DC Mini Metal Gear Motors

• Each motor has two inputs, IN1 and IN2, which are connected to MA1, MA2 and MB1, MB2 on the L293 Motor Driver respectively

Documented Code

Arduino Nano Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

This code template provides the basic structure for the Arduino Nano's firmware. The setup() function is called once when the microcontroller is powered on or reset. It is used to initialize the pins and set up the communication protocols. The loop() function is called repeatedly and contains the main logic for controlling the motors, reading sensor data, and handling Bluetooth communication.

Additional Notes

• The provided code is a template and does not contain any specific logic.
• The actual implementation should include motor control algorithms, sensor data processing, and Bluetooth communication handling.
• The setup() function should configure the pin modes and initialize the serial communication if needed.
• The loop() function should include the code to read the IR sensors, control the motors via the L293 driver, and manage Bluetooth communication with the HC-05 module.