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Nodemcu Wi-fi Controlled Car

Made by Aaryan_Kumar / Automotive / Communication / Vehicles / IoT

About the project

Wi-Fi controlled car made with NodeMCU

Project info

Difficulty: Moderate

Platforms: Android, Arduino

Estimated time: 3 hours

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

	NodeMCU v2-Lua based ESP8266 development kit	x 1
	L298 Dual H-Bridge Motor Driver	x 1
	Mountable Slide Switch	x 1
	DC Gear Motor 12V 100RPM	x 4
	Half-size Breadboard Optional	x 1
	Lithium Ion Battery - 18650 Cell (2600mAh)	x 2

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

	Hot glue gun	x 1
	Soldering Iron Kit	x 1

Story

Introduction

Hello there! Anything that can be controlled is great, isn't it? We humans love controlling stuff and that is why automation and robotics are so fascinating.

This tutorial will teach you how to create your own Wi-Fi controlled car. So lets get started.

This will be a Wi-Fi controlled car so for this project we will be using a NodeMCU to receive the controlling data packets. We will also need an android app which will be sending the controlling data packets to the NodeMCU . We will be using a third party application for this purpose. Here is the link.

Building the car

Once I got all the parts I wanted to build it and test it. But there was no chassis. I look around and found a DVD casing. Well that's not the best choice but it serves for the time being :-) . I've used hot glue to attach the motors to the car.

Circuit

Follow the schematic to make the connections. To power the car, I've used 2x 18650 batteries but you can use any battery for your choice. Here is the circuit :

Here's the bottom view of the car with the battery and a little bit structural engineering (nvm the wires) :

Coding

Now that we have made our car its time to program it . You can find the code below.

1. Upload the code to the NodeMCU

2. Make the connections.

3. Launch the app.

4. Connect your phone to the car.

5. Enjoy !

Congratulations ! You've made your own Wi-Fi controlled car.

Here's our finished beauty !

Here's the video of my car : https://www.instagram.com/p/CaMj5NTFHr0/

I hope this tutorial was good enough to get you going. If you got any suggestions for some changes or further addition to this project then please let me know in the comment section.

Schematics, diagrams and documents

Connections

Code

#define ENA   14          // Enable/speed motors Right        GPIO14(D5)
#define ENB   12          // Enable/speed motors Left         GPIO12(D6)
#define IN_1  15          // L298N in1 motors Rightx          GPIO15(D8)
#define IN_2  13          // L298N in2 motors Right           GPIO13(D7)
#define IN_3  2           // L298N in3 motors Left            GPIO2(D4)
#define IN_4  0           // L298N in4 motors Left            GPIO0(D3)

#include <ESP8266WiFi.h>
#include <WiFiClient.h> 
#include <ESP8266WebServer.h>

String command;             //String to store app command state.
int speedCar = 800;         // 400 - 1023.
int speed_Coeff = 3;

const char* ssid = "Wifi_Car";
ESP8266WebServer server(80);

void setup() {
 
 pinMode(ENA, OUTPUT);
 pinMode(ENB, OUTPUT);  
 pinMode(IN_1, OUTPUT);
 pinMode(IN_2, OUTPUT);
 pinMode(IN_3, OUTPUT);
 pinMode(IN_4, OUTPUT); 
  
  Serial.begin(115200);
  
// Connecting WiFi

  WiFi.mode(WIFI_AP);
  WiFi.softAP(ssid);

  IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);
 
 // Starting WEB-server 
     server.on ( "/", HTTP_handleRoot );
     server.onNotFound ( HTTP_handleRoot );
     server.begin();    
}

void goAhead(){ 

      digitalWrite(IN_1, LOW);
      digitalWrite(IN_2, HIGH);
      analogWrite(ENA, speedCar);

      digitalWrite(IN_3, LOW);
      digitalWrite(IN_4, HIGH);
      analogWrite(ENB, speedCar);
  }

void goBack(){ 

      digitalWrite(IN_1, HIGH);
      digitalWrite(IN_2, LOW);
      analogWrite(ENA, speedCar);

      digitalWrite(IN_3, HIGH);
      digitalWrite(IN_4, LOW);
      analogWrite(ENB, speedCar);
  }

void goRight(){ 

      digitalWrite(IN_1, HIGH);
      digitalWrite(IN_2, LOW);
      analogWrite(ENA, speedCar);

      digitalWrite(IN_3, LOW);
      digitalWrite(IN_4, HIGH);
      analogWrite(ENB, speedCar);
  }

void goLeft(){

      digitalWrite(IN_1, LOW);
      digitalWrite(IN_2, HIGH);
      analogWrite(ENA, speedCar);

      digitalWrite(IN_3, HIGH);
      digitalWrite(IN_4, LOW);
      analogWrite(ENB, speedCar);
  }

void goAheadRight(){
      
      digitalWrite(IN_1, LOW);
      digitalWrite(IN_2, HIGH);
      analogWrite(ENA, speedCar/speed_Coeff);
 
      digitalWrite(IN_3, LOW);
      digitalWrite(IN_4, HIGH);
      analogWrite(ENB, speedCar);
   }

void goAheadLeft(){
      
      digitalWrite(IN_1, LOW);
      digitalWrite(IN_2, HIGH);
      analogWrite(ENA, speedCar);

      digitalWrite(IN_3, LOW);
      digitalWrite(IN_4, HIGH);
      analogWrite(ENB, speedCar/speed_Coeff);
  }

void goBackRight(){ 

      digitalWrite(IN_1, HIGH);
      digitalWrite(IN_2, LOW);
      analogWrite(ENA, speedCar/speed_Coeff);

      digitalWrite(IN_3, HIGH);
      digitalWrite(IN_4, LOW);
      analogWrite(ENB, speedCar);
  }

void goBackLeft(){ 

      digitalWrite(IN_1, HIGH);
      digitalWrite(IN_2, LOW);
      analogWrite(ENA, speedCar);

      digitalWrite(IN_3, HIGH);
      digitalWrite(IN_4, LOW);
      analogWrite(ENB, speedCar/speed_Coeff);
  }

void stopRobot(){  

      digitalWrite(IN_1, LOW);
      digitalWrite(IN_2, LOW);
      analogWrite(ENA, speedCar);

      digitalWrite(IN_3, LOW);
      digitalWrite(IN_4, LOW);
      analogWrite(ENB, speedCar);
 }

void loop() {
    server.handleClient();
    
      command = server.arg("State");
      if (command == "F") goAhead();
      else if (command == "B") goBack();
      else if (command == "L") goLeft();
      else if (command == "R") goRight();
      else if (command == "I") goAheadRight();
      else if (command == "G") goAheadLeft();
      else if (command == "J") goBackRight();
      else if (command == "H") goBackLeft();
      else if (command == "S") stopRobot();
}

void HTTP_handleRoot(void) {

if( server.hasArg("State") ){
       Serial.println(server.arg("State"));
  }
  server.send ( 200, "text/html", "" );
  delay(1);
}

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Nodemcu Wi-fi Controlled Car

About the project

Project info