Arduino Tutorials – Lesson 24 – L298N Motor Driver with Node MCU

Creating 2 DC Motors and 2 LEDs using wifi control program using Arduino UNO

Required Components

1. Node MCU -1 no
2. L298N Motor Driver -1 no
3. 9V Battery -1 no
4. 5V DC Motor -2 no
5. Motor wheel -2 no
6. Cable -1 no
7. Jumper Wires -7 no

Circuit

• 

Steps

1. Make sure the components are working properly.
2. Connect the 9V Battery to the L298N Motor Driver.
3. Connect the ENA, IN1, IN2, IN3, IN4, ENB pins to the Node MCU pins D2, D0, D1, D7, D6, D5 properly.
4. Connect the DC motor pins to the motor driver output pins.
5. Connect the ground connection respectively.
6. If you want connect the LED pins Cathode (+) & Anode (-) to the Node MCU pins D3, D4 & gnd respectively.
7. Check the Arduino program.
8. Check the Circuit Connections.
9. Run the Arduino program.

Arduino Program

#include <ESP8266WiFi.h>
const char* ssid = "*****";
const char* password = "********";
int motor1pin1 = 16; //D0
int motor1pin2 = 5; //D1
int enPin1 = 4; //D2
int motor2pin1 = 13; //D7
int motor2pin2 = 12; //D6
int enPin2 = 14;//D5

int led1 = 0; //D3
int led2 = 2; //D4
WiFiServer server(80);

void setup() 
{
  Serial.begin(115200);
  delay(10);
  pinMode(motor1pin1, OUTPUT);
  pinMode(motor1pin2, OUTPUT);
  pinMode(enPin1, OUTPUT);
  digitalWrite(enPin1, HIGH);
  pinMode(motor2pin1, OUTPUT);
  pinMode(motor2pin2, OUTPUT);
  pinMode(enPin2, OUTPUT);
  digitalWrite(enPin2, HIGH);
  
  pinMode(led1,OUTPUT);
  pinMode(led2,OUTPUT);
  
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  server.begin();
  Serial.println("Server started");
  Serial.print("Use this URL to connect: ");
  Serial.print("http://");
  Serial.print(WiFi.localIP());
  Serial.println("/");
}

void loop() 
{
  WiFiClient client = server.available();
  if (!client) {
    return;
  }
  Serial.println("new client");
  while(!client.available()){
    delay(1);
  }
  String request = client.readStringUntil('\r');
  Serial.println(request);
  client.flush();
  int value,value1 = LOW,value2 = LOW,value3 = LOW,value4 = LOW;
  if (request.indexOf("/MotorForward") != -1)
  {
    digitalWrite(motor1pin1, HIGH);
    digitalWrite(motor1pin2, LOW);
    digitalWrite(motor2pin1, HIGH);
    digitalWrite(motor2pin2, LOW);
    delay(1000);
    value1 = HIGH;
    value2 = LOW;
    value3 = HIGH;
    value4 = LOW;
  }
  if (request.indexOf("/MotorBackward") != -1)
  {
    digitalWrite(motor1pin1, LOW);
    digitalWrite(motor1pin2, HIGH);
    digitalWrite(motor2pin1, LOW);
    digitalWrite(motor2pin2, HIGH);
    delay(1000);
    value1 = LOW;
    value2 = HIGH;
    value3 = LOW;
    value4 = HIGH;
  }
  if (request.indexOf("/MotorLeft") != -1)
  {
    digitalWrite(motor1pin1, LOW);
    digitalWrite(motor1pin2, HIGH);
    digitalWrite(motor2pin1, HIGH);
    digitalWrite(motor2pin2, LOW);
    delay(1000);
    value1 = LOW;
    value2 = HIGH;
    value3 = HIGH;
    value4 = LOW;
  }
  if (request.indexOf("/MotorRight") != -1)
  {
    digitalWrite(motor1pin1, HIGH);
    digitalWrite(motor1pin2, LOW);
    digitalWrite(motor2pin1, LOW);
    digitalWrite(motor2pin2, HIGH);
    delay(1000);
    value1 = HIGH;
    value2 = LOW;
    value3 = LOW;
    value4 = HIGH;
  }
  if (request.indexOf("/MotorStop") != -1)
  {
    digitalWrite(motor1pin1, LOW);
    digitalWrite(motor1pin2, LOW);
    digitalWrite(motor2pin1, LOW);
    digitalWrite(motor2pin2, LOW);
    delay(1000);
    value1 = LOW;
    value2 = LOW;
    value3 = LOW;
    value4 = LOW;
  }
  
  if (request.indexOf("/LedOn") != -1)
  {
    digitalWrite(led1,HIGH);
    digitalWrite(led2,HIGH);
    delay(2000);
    value = HIGH;
  }
  
  if (request.indexOf("/LedOn") != -1)
  {
    digitalWrite(led1,LOW);
    digitalWrite(led2,LOW);
    delay(2000);
    value = LOW;
  }
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println(""); //  do not forget this one
  client.println("<!DOCTYPE HTML>");
  client.println("<html>");
  client.print("motor is now: ");
  
  if(value1 == HIGH && value2 == LOW && value3 == HIGH && value4 == LOW ) {
    client.print("Forward");
  }
  else if(value1 == LOW && value2 == HIGH && value3 == LOW && value4 == HIGH  ) {
    client.print("Backward");
  }
  else if(value1 == LOW && value2 == HIGH && value3 == HIGH && value4 == LOW  ) {
    client.print("Left");
  }
  else if(value1 == HIGH && value2 == LOW && value3 == LOW && value4 == HIGH  ) {
    client.print("Right");
  }
  else if(value1 == LOW && value2 == LOW && value3 == LOW && value4 == LOW  ) {
    client.print("Stop");
  }
  else if( value = HIGH) {
    client.print("LedOn");
  }
  else if( value = LOW) {
    client.print("LedOff");
  }
  client.println("<br><br>");
  client.println("<a href=\"/MotorForward\"\"><button>Forward </button></a>");
  client.println("<a href=\"/MotorBackward\"\"><button>Backward </button></a><br />");
  client.println("<a href=\"/MotorLeft\"\"><button>Left </button></a>");
  client.println("<a href=\"/MotorRight\"\"><button>Right </button></a><br/>");
  client.println("<a href=\"/MotorStop\"\"><button>Stop </button></a>");
  client.println("<a href=\"/LedOn\"\"><button>LedOn </button></a>");
  client.println("<a href=\"/LedOff\"\"><button>LedOff </button></a>");
  client.println("</html>");
  delay(1);
  Serial.println("Client disonnected");
  Serial.println("");
}

Projects

1. DIWA Robot