Circuit Documentation

Summary

This circuit is designed to control two DC motors with encoders using an ESP32 microcontroller and two Adafruit DRV8871 motor drivers. The ESP32 is responsible for driving the motors via the motor drivers and reading the encoder signals to determine the position and speed of the motors. The circuit is powered by a DC power source.

Component List

ESP32 - 38 pins

• Description: A microcontroller with WiFi and Bluetooth capabilities and a variety of GPIO pins.
• Purpose: Acts as the central processing unit for controlling the motor drivers and reading encoder signals.

DC Motor with Encoder (x2)

• Description: A DC motor with an integrated quadrature encoder for position and speed feedback.
• Purpose: Provides mechanical actuation for the system.

Adafruit DRV8871 Motor Driver (x2)

• Description: A motor driver capable of driving a single DC motor.
• Purpose: Controls the direction and speed of the connected DC motor.

DC Power Source

• Description: Provides the necessary power to drive the motors and the electronics.
• Purpose: Supplies power to the motor drivers and the ESP32 microcontroller.

Wiring Details

ESP32 - 38 pins

• GND connected to the ground net of the circuit.
• G33 connected to IN1 of the first Adafruit DRV8871 motor driver.
• G32 connected to IN2 of the first Adafruit DRV8871 motor driver.
• G26 connected to IN1 of the second Adafruit DRV8871 motor driver.
• G25 connected to IN2 of the second Adafruit DRV8871 motor driver.
• G35 connected to Encoder B of the first DC Motor with Encoder.
• G34 connected to Encoder A of the first DC Motor with Encoder.
• G27 connected to Encoder B of the second DC Motor with Encoder.
• G14 connected to Encoder A of the second DC Motor with Encoder.
• 5V connected to VCC of both DC Motors with Encoder.

DC Motor with Encoder

• Encoder B and Encoder A connected to the ESP32 for feedback.
• GND connected to the ground net of the circuit.
• VCC connected to the 5V output from the ESP32.
• Motor +ve and Motor -ve connected to OUT2 and OUT1 respectively of the corresponding Adafruit DRV8871 motor driver.

Adafruit DRV8871 Motor Driver

• GND connected to the ground net of the circuit.
• VMOTOR connected to the positive terminal of the DC Power Source.
• IN1 and IN2 connected to the corresponding GPIO pins on the ESP32 for motor control.
• OUT1 and OUT2 connected to the Motor -ve and Motor +ve pins of the corresponding DC Motor with Encoder.

DC Power Source

• Ground connected to the ground net of the circuit.
• Positive connected to VMOTOR of both Adafruit DRV8871 motor drivers.

Documented Code

There is no code provided for the microcontroller. The code would typically include initialization of GPIO pins, PWM setup for motor control, interrupt configuration for encoder reading, and the main control loop for driving the motors based on the desired logic.