Example Code for Arduino-PWM-driven DC Motors

Hardware Preparation

• DC Motors: x2
• Romeo Mini: x1

Software Preparation

1. Arduino IDE (download link: https://www.arduino.cc/en/software)
2. ESP32 board support package (version 2.0.0) installed via Arduino Boards Manager (follow the [Arduino Environment Configuration] steps)

Wiring Diagram

The module is powered by 5-12V. Choose an appropriate power supply voltage based on the motors.

Other Preparation Work

1. Add the ESP32 board URL to Arduino IDE: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
2. Install the ESP32 board support package (version 2.0.0) via Tools -> Board -> Boards Manager
3. Select "ESP32C3 Dev Module" from Tools -> Board
4. Configure USB CDC to "Enable" for serial monitor use
5. Select the correct serial port (press and hold BOOT + RST if the port is not recognized)

Sample Code

int EN1 = 0; // PWM control for motor M1
int PH1 = 1; // Direction control for motor M1
int EN2 = 2; // PWM control for motor M2
int PH2 = 10; // Direction control for motor M2

void setup() {
  pinMode(EN1, OUTPUT);
  pinMode(PH1, OUTPUT);
  pinMode(EN2, OUTPUT);
  pinMode(PH2, OUTPUT);
}

void loop() {
  M1_Forward(200); // Motor M1 moves forward with adjustable PWM
  M2_Forward(200); // Motor M2 moves forward with adjustable PWM
  delay(5000);
  M1_Backward(200); // Motor M1 moves backward with adjustable PWM
  M2_Backward(200); // Motor M2 moves backward with adjustable PWM
  delay(5000);
}

void M1_Forward(int Speed1) // Forward fast decay mode for M1 motor, larger Speed1 value results in faster motor rotation
{
  analogWrite(EN1, Speed1);
  digitalWrite(PH1, LOW);
}

void M1_Backward

Result

Execute the sample program by commanding simultaneous rapid forward rotation of motors M1 and M2, followed by simultaneous slow reverse rotation of motors M1 and M2.