Circuit Documentation

Summary

The circuit in question is designed to interface an Arduino Leonardo (Rev3b) with multiple servo motors, an HC-05 Bluetooth module, a Neurosky Sensor, and an Adafruit PCA9685 PWM Servo Breakout board. The circuit is powered by a 12V battery, and it includes communication between the Arduino and the Bluetooth module, as well as the Neurosky Sensor. The servos are controlled via PWM signals, which are generated by the Arduino and the PCA9685 breakout board. The circuit is intended for wireless control of servos, possibly for a robotic or remote control application, with inputs from a Neurosky Sensor.

Component List

Arduino Leonardo (Rev3b)

• Microcontroller board based on the ATmega32u4
• Features digital I/O pins, analog inputs, a USB connection, and other peripherals

Servo Motors

• Actuators that can be precisely controlled in terms of angular or linear position, velocity, and acceleration
• Each servo has three connections: ground (gnd), power (vcc), and control signal (pulse)

HC-05 Bluetooth Module

• Wireless communication module that allows for serial communication over Bluetooth
• Has pins for key, power (VCC), ground (GND), transmit (TXD), receive (RXD), and state

Neurosky Sensor

• Brainwave sensor module with pins for power (VCC), data output (DATA), and ground (GND)

Adafruit PCA9685 PWM Servo Breakout

• 16-channel, 12-bit PWM Fm+ I2C-bus LED controller
• Used for driving multiple PWM outputs, such as servo motors

Battery 12V

• Power source for the circuit

Wiring Details

Arduino Leonardo (Rev3b)

• D0/RX connected to HC-05 Bluetooth Module TXD
• D1/TX connected to HC-05 Bluetooth Module RXD
• D3 PWM/SCL, D5 PWM, D6 PWM/A7, D9 PWM/A9, D10 PWM/A10 connected to corresponding servo motors and Adafruit PCA9685 PWM Servo Breakout PWM outputs
• 5V connected to the VCC of all servos, HC-05 Bluetooth Module, Neurosky Sensor, and Adafruit PCA9685 PWM Servo Breakout
• GND connected to the ground of all components and the negative terminal of the battery
• VIN connected to the positive terminal of the battery
• A4 connected to Adafruit PCA9685 PWM Servo Breakout SDA
• A5 connected to Adafruit PCA9685 PWM Servo Breakout SCL

Servo Motors

• gnd connected to common ground
• vcc connected to 5V from Arduino Leonardo (Rev3b)
• pulse connected to corresponding PWM outputs on Arduino Leonardo (Rev3b) and Adafruit PCA9685 PWM Servo Breakout

HC-05 Bluetooth Module

• TXD connected to Arduino Leonardo (Rev3b) D0/RX
• RXD connected to Arduino Leonardo (Rev3b) D1/TX
• VCC connected to 5V from Arduino Leonardo (Rev3b)
• GND connected to common ground

Neurosky Sensor

• VCC connected to 5V from Arduino Leonardo (Rev3b)
• GND connected to common ground

Adafruit PCA9685 PWM Servo Breakout

• 5.0V connected to 5V from Arduino Leonardo (Rev3b)
• GND connected to common ground
• SDA connected to Arduino Leonardo (Rev3b) A4
• SCL connected to Arduino Leonardo (Rev3b) A5
• PWM0 to PWM4 connected to corresponding servo motors

Battery 12V

• + connected to Arduino Leonardo (Rev3b) VIN
• - connected to common ground

Documented Code

No code was provided for the microcontrollers in the circuit. Typically, the code would be responsible for initializing the communication interfaces (such as serial for Bluetooth communication), configuring the PWM outputs for servo control, and implementing the logic for responding to sensor inputs or Bluetooth commands to control the servos.