Circuit Documentation

Summary

This circuit is designed to control two DC motors using an L298N motor driver and a NUCLEO-F072RB microcontroller. The speed of the motors is controlled by two potentiometers. The circuit is powered by a 12V battery.

Component List

1. NUCLEO-F072RB

   • Description: Microcontroller board based on the STM32F072RB MCU.
   • Pins: A5, A4, A3, A2, A1, A0, VN, GND, 5V, 3V3, RESET, IOREF, SCL/D15, SDA/D14, AVDD, SCK/D13, MISO/D12, PWM/MOSI/D11, PWM/CS/D10, PWM/D9, D8, D7, PWM/D6, PWM/D5, D4, PWM/D3, D2, TX/D1, RX/D0

2. L298N DC Motor Driver

   • Description: Dual H-Bridge motor driver for controlling DC motors.
   • Pins: OUT1, OUT2, 12V, GND, 5V, OUT3, OUT4, 5V-ENA-JMP-I, 5V-ENA-JMP-O, +5V-J1, +5V-J2, ENA, IN1, IN2, IN3, IN4, ENB

3. DC Motor

   • Description: Standard DC motor.
   • Pins: pin 1, pin 2

4. Potentiometer

   • Description: Variable resistor used to control voltage.
   • Pins: GND, Output, VCC

5. 12V Battery

   • Description: Power source for the circuit.
   • Pins: VCC, GND

Wiring Details

NUCLEO-F072RB

• A1 connected to Output of Potentiometer
• A0 connected to Output of Potentiometer
• GND connected to GND of 12V Battery
• GND connected to GND of Potentiometer
• 5V connected to 5V of L298N DC Motor Driver
• 3V3 connected to VCC of Potentiometer
• GND connected to GND of L298N DC Motor Driver
• PWM/CS/D10 connected to ENB of L298N DC Motor Driver
• PWM/D9 connected to ENA of L298N DC Motor Driver
• D8 connected to IN4 of L298N DC Motor Driver
• D7 connected to IN3 of L298N DC Motor Driver
• PWM/D6 connected to IN2 of L298N DC Motor Driver
• PWM/D5 connected to IN1 of L298N DC Motor Driver

L298N DC Motor Driver

• OUT1 connected to pin 1 of DC Motor
• OUT2 connected to pin 2 of DC Motor
• 12V connected to VCC of 12V Battery
• OUT3 connected to pin 1 of DC Motor
• OUT4 connected to pin 2 of DC Motor

Potentiometer

• Output connected to A1 of NUCLEO-F072RB
• Output connected to A0 of NUCLEO-F072RB
• GND connected to GND of NUCLEO-F072RB
• VCC connected to 3V3 of NUCLEO-F072RB

12V Battery

• GND connected to GND of NUCLEO-F072RB
• VCC connected to 12V of L298N DC Motor Driver

Code Documentation

Main Code

#include "mbed.h"

// Define the analog input pins for potentiometers
AnalogIn pot1(A0);
AnalogIn pot2(A1);

// Define the digital output pins for motor control
PwmOut motor1_ena(D9);
DigitalOut motor1_in1(D5);
DigitalOut motor1_in2(D6);

PwmOut motor2_ena(D10);
DigitalOut motor2_in3(D7);
DigitalOut motor2_in4(D8);

int main() {
    while (1) {
        // Read the analog value from the potentiometers
        float potValue1 = pot1.read(); // Value between 0.0 and 1.0
        float potValue2 = pot2.read(); // Value between 0.0 and 1.0

        // Set motor speeds based on potentiometer values
        motor1_ena.write(potValue1);
        motor2_ena.write(potValue2);

        // Set motor directions (example: forward)
        motor1_in1 = 1;
        motor1_in2 = 0;
        motor2_in3 = 1;
        motor2_in4 = 0;

        // Wait for a short period
        wait(0.1);
    }
}

Additional Documentation

Link to additional documentation