Circuit Documentation

Summary

This circuit is designed to control a DC motor using an ESP8266 NodeMCU microcontroller and an L298N motor driver. The ESP8266 NodeMCU sends control signals to the L298N motor driver, which in turn drives the DC motor. A 12V power supply is used to power the motor driver and the motor.

Component List

ESP8266 NodeMCU

• Description: A low-cost Wi-Fi microcontroller with GPIO, PWM, ADC, and more.
• Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN

DC Motor

• Description: A simple DC motor with two terminals for power.
• Pins: pin 1, pin 2

12V Power Supply

• Description: A power supply providing 12V DC.
• Pins: +, -

L298N DC Motor Driver

• Description: A dual H-Bridge motor driver that can control the speed and direction of two 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

Wiring Details

ESP8266 NodeMCU

• GND connected to GND of the 12V power supply and L298N motor driver.
• D5 connected to ENA of the L298N motor driver.
• D6 connected to IN1 of the L298N motor driver.
• D7 connected to IN2 of the L298N motor driver.
• VIN connected to 5V of the L298N motor driver.

DC Motor

• pin 1 connected to OUT1 of the L298N motor driver.
• pin 2 connected to OUT2 of the L298N motor driver.

12V Power Supply

• - connected to GND of the ESP8266 NodeMCU and L298N motor driver.
• + connected to 12V of the L298N motor driver.

L298N DC Motor Driver

• GND connected to GND of the 12V power supply and ESP8266 NodeMCU.
• ENA connected to D5 of the ESP8266 NodeMCU.
• IN1 connected to D6 of the ESP8266 NodeMCU.
• IN2 connected to D7 of the ESP8266 NodeMCU.
• 5V connected to VIN of the ESP8266 NodeMCU.
• OUT1 connected to pin 1 of the DC motor.
• OUT2 connected to pin 2 of the DC motor.
• 12V connected to + of the 12V power supply.

Code Documentation

ESP8266 NodeMCU Code

#include <L298N.h>

const unsigned int IN1 = 6;
const unsigned int IN2 = 7;
const unsigned int EN = 5;

L298N motor(EN, IN1, IN2);

void setup()
{
  Serial.begin(9600);
  while (!Serial)
  { }
  motor.setSpeed(70);
}

void loop()
{
  motor.forward();
  printSomeInfo();
  delay(3000);
  motor.stop();
  printSomeInfo();
  motor.setSpeed(255);
  delay(3000);
  motor.backward();
  printSomeInfo();
  motor.setSpeed(120);
  delay(3000);
  motor.stop();
  printSomeInfo();
  delay(3000);
}

void printSomeInfo()
{
  Serial.print("Motor is moving = ");
  Serial.print(motor.isMoving());
  Serial.print(" at speed = ");
  Serial.println(motor.getSpeed());
}

Code Explanation

• Libraries: The code includes the L298N library to control the motor driver.
• Pin Definitions: The pins for IN1, IN2, and EN are defined.
• Motor Initialization: An instance of the L298N class is created with the defined pins.
• Setup Function: Initializes the serial communication and sets the initial motor speed to 70.
• Loop Function: Controls the motor to move forward, stop, move backward, and stop again with varying speeds and delays.
• printSomeInfo Function: Prints the motor's movement status and speed to the serial monitor.

This documentation provides a comprehensive overview of the circuit, including the components used, their wiring, and the code running on the ESP8266 NodeMCU.