Circuit Documentation

Summary

This circuit integrates an Arduino Mega 2560 with a NodeMCU V3 ESP8266 to control multiple DC motors via two L298N DC motor drivers. The Arduino Mega 2560 serves as the primary microcontroller, interfacing with the motor drivers to manage the direction and speed of the motors. The NodeMCU V3 ESP8266 is used for additional control and communication capabilities. The circuit is designed to provide a platform for motor control applications, such as robotics or automated systems.

Component List

Arduino Mega 2560

• Microcontroller board based on the ATmega2560
• Provides a large number of I/O pins, including PWM outputs and communication interfaces

NodeMCU V3 ESP8266

• Microcontroller board with Wi-Fi capability
• Based on the ESP8266 SoC, it offers GPIO, analog input, and serial communication

L298N DC Motor Driver (x2)

• Dual H-bridge motor driver module
• Capable of driving two DC motors or one stepper motor

DC Motor (x5)

• Standard DC motors for motion applications
• Connected to the motor driver for directional and speed control

Wiring Details

Arduino Mega 2560

• GND connected to common ground
• 5V connected to the 5V power rail
• D3 PWM to IN4 on L298N (Motor Driver 1)
• D4 PWM to IN3 on L298N (Motor Driver 1)
• D5 PWM to ENA on L298N (Motor Driver 1)
• D6 PWM to ENB on L298N (Motor Driver 1)
• D7 PWM to IN2 on L298N (Motor Driver 1)
• D8 PWM to IN1 on L298N (Motor Driver 1)
• D10 PWM connected to D6 on NodeMCU V3 ESP8266
• D11 PWM connected to D5 on NodeMCU V3 ESP8266

NodeMCU V3 ESP8266

• GND connected to common ground
• Vin connected to the 5V power rail
• D3 to IN4 on L298N (Motor Driver 2)
• D4 to IN3 on L298N (Motor Driver 2)
• D7 to IN2 on L298N (Motor Driver 2)
• D8 to IN1 on L298N (Motor Driver 2)

L298N DC Motor Driver 1

• GND connected to common ground
• 5V connected to the 5V power rail
• OUT1 and OUT2 connected to two DC Motors (Motor 1 and Motor 2)
• OUT3 and OUT4 connected to one DC Motor (Motor 3)

L298N DC Motor Driver 2

• GND connected to common ground
• 5V connected to the 5V power rail
• OUT1 and OUT2 connected to one DC Motor (Motor 4)
• OUT3 and OUT4 connected to two DC Motors (Motor 5 and Motor 6)

DC Motors

• Each motor has two pins: pin 1 and pin 2
• Motors are connected to the respective outputs of the L298N motor drivers

Documented Code

Arduino Mega 2560 Code

#include <SoftwareSerial.h>

// Define the pins for SoftwareSerial
const int rxPin = D6; // RX pin for SoftwareSerial
const int txPin = D5; // TX pin for SoftwareSerial

SoftwareSerial mySerial(rxPin, txPin); // RX, TX

void setup() {
  Serial.begin(9600); // For debugging
  mySerial.begin(9600); // Baud rate for communication with Arduino Mega

  Serial.println("NodeMCU is ready");
}

void loop() {
  // Send a test command to Arduino Mega
  mySerial.println("TEST_COMMAND");

  // Check if there is any data from Arduino Mega
  if (mySerial.available()) {
    String receivedData = mySerial.readString();
    Serial.print("Received from Arduino Mega: ");
    Serial.println(receivedData);
  }

  delay(5000); // Wait for 5 seconds
}

This code snippet is for the Arduino Mega 2560, which sets up a SoftwareSerial communication link with the NodeMCU V3 ESP8266. It sends a test command to the NodeMCU and prints any received data to the serial monitor for debugging purposes. The communication operates at a baud rate of 9600.