Overview
Things
Story

M5Stack(client)
MPU6050
NodeMCU(server)
HOW TO CONTROL
library
Action

Published May 24, 2020

M5Stack ROBOT with NodeMCU and MPU6050

M5Stack robot car which we can control with mpu6050 module through WiFi with NodeMCU

IntermediateFull instructions provided1 hour2,252

Things used in this project

Hardware components

M5Stack ESP32 Basic Core IoT Development Kit

NodeMCU ESP8266 Breakout Board

SparkFun Full-Bridge Motor Driver Breakout - L298N

DC Motor, 12 V

Breadboard (generic)

DFRobot 6 DOF Sensor - MPU6050

Male/Female Jumper Wires

9V battery (generic)

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering Station, 110 V

Multitool, Screwdriver

Hot glue gun (generic)

Story

I want a robot that runs on my hand movement. I can also do this with my smartphone I go with M5Stack and NodeMCU.
As I have the core kit of M5Stack there is no imu in it. so that's why I added an MPU6T050 in it. to get all data I need.
I use some female headers to connect it.

and connected it to M5Stack.

VCC ---- 3.3v

GND ---- GND

SCL ---- SCL

SDA ---- SDA

M5Stack(client):

M5Stack will work as a remote control for the robot.
with MPU6050 we are calculating "PITCH" and "ROLL".

WEB CLIENT:

so here we are working as a client for the server.
so it's similar to web server, where we give commands from our devices to the board,

HOW IT WORKS:

so if we need to turn on a led by using this server and client system then we will connect to the server and write led after its IP ex--- 198.168.43.212/led
then the server will read it and do work as assigned, to turn ON the led.

MPU6050:

so I'm using the sketch that comes with the M5Stack library.

I'm modifying the sketch as per my need.

NodeMCU(server):

so we begin a server that reads what client print.
so as I gave the example up there that if server reads led then it will turn on the led or do as per commands.
to ensure that it's working you can also connect to the server with your phone and type led to check everything is working or not.
so let's talk about the connection of robot.

I'm using here a motor controller L298N.

so here we are not controlling motor speed that's why we are not going to connect the wire to enable A or B.
here you get how to use l298n.

D1 ---- INPUT1

D2 ---- INPUT2

D3 ---- INPUT3

D4 ---- INPUT4

I'm using this type of robot kit.

HOW TO CONTROL:

CLIENT SIDE:

if(roll >= 40){
  M5.Lcd.print("[HTTP] begin...\n");
        
        http.begin("http://192.168.4.1/right"); 
        M5.Lcd.fillScreen(RED);        
        int httpCode = http.GET();

        http.end();
    
    }
    else if(roll <= -40){
      M5.Lcd.print("[HTTP] begin...\n");
        
        http.begin("http://192.168.4.1/left"); //HTTP
        M5.Lcd.fillScreen(BLUE);        
        int httpCode = http.GET();

        http.end();
    }
       else if(pitch >= 40){
   M5.Lcd.print("[HTTP] begin...\n");
       
        http.begin("http://192.168.4.1/forward"); //HTTP
        M5.Lcd.fillScreen(YELLOW);        
        int httpCode = http.GET();

        http.end();
    }
    else if(pitch <= -40){
       M5.Lcd.print("[HTTP] begin...\n");
         
        http.begin("http://192.168.4.1/back"); //HTTP
        M5.Lcd.fillScreen(WHITE);        
        int httpCode = http.GET();

        http.end();
    }

so these lines decide where the robot will move this is from the M5Stack side(remote).
so if the value of roll is more or equal to 40 it will write right.
and if the value of roll is less or equal to 40 it will write left.
and if the value of pitch is more or equal to 40 it will write forward.
and if the value of pitch is less or equal to 40 it will write back
SERVER SIDE:

void forward(){
  digitalWrite(5, 1);
  digitalWrite(0, 1);
  delay(2000);
  digitalWrite(5,0);
  digitalWrite(0,0);
  delay(1000);  
}

if the client writes forward robot will follow this void forward and go forward
this way there are for back, right, and left.

library:

you will find the M5Stack library here.

Action:

if you will go for the right screen will fill with red.
if you will go for the left screen will fill with blue.
if you will go for the forward screen will fill with yellow.
if you will go for the back screen will fill with white.

if you have any problem with it then do let me know in the comment section.

#define M5STACK_MPU6050 
#include <M5Stack.h>
#include <WiFi.h>
#include <HTTPClient.h>
float pitch = 0.0F;
float roll  = 0.0F;
float yaw   = 0.0F;
const char* ssid ="ESPcar";
const char* password ="12345678";
void setup(){
  M5.begin();  
  M5.Power.begin();   
  M5.IMU.Init();
  for(uint8_t t = 4; t > 0; t--) {
        Serial.printf("[SETUP] WAIT %d...\n", t);
        Serial.flush();
        delay(1000);
    }
      WiFi.mode(WIFI_STA);
      WiFi.disconnect(true);
    WiFi.begin(ssid,password);
    while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    M5.Lcd.print(".");
 
    delay(15000);
    M5.Lcd.println("Connected");
  }
}
void loop() {
   
  M5.IMU.getAhrsData(&pitch,&roll,&yaw);
  if((WiFi.status() == WL_CONNECTED)) {

        HTTPClient http;      
  
  if(roll >= 40){
  M5.Lcd.print("[HTTP] begin...\n");
        
        http.begin("http://192.168.4.1/right"); 
        M5.Lcd.fillScreen(RED);        
        int httpCode = http.GET();

        http.end();
    
    }
    else if(roll <= -40){
      M5.Lcd.print("[HTTP] begin...\n");
        
        http.begin("http://192.168.4.1/left"); //HTTP
        M5.Lcd.fillScreen(BLUE);        
        int httpCode = http.GET();

        http.end();
    }
       else if(pitch >= 40){
   M5.Lcd.print("[HTTP] begin...\n");
       
        http.begin("http://192.168.4.1/forward"); //HTTP
        M5.Lcd.fillScreen(YELLOW);        
        int httpCode = http.GET();

        http.end();
    }
    else if(pitch <= -40){
       M5.Lcd.print("[HTTP] begin...\n");
         
        http.begin("http://192.168.4.1/back"); //HTTP
        M5.Lcd.fillScreen(WHITE);        
        int httpCode = http.GET();

        http.end();
    }
    else{
       M5.Lcd.fillScreen(GREEN);
      }
  }
    
  delay(1);
}//////AMAAN JAVED/////////////

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

const char *ssid = "ESPcar";
const char *password = "12345678";

ESP8266WebServer server(80);

void handleRoot() {
  server.send(200, "text/html", "<h1>You are connected</h1>");
}

void forward(){
  digitalWrite(5, 1);
  digitalWrite(0, 1);
  delay(2000);
  digitalWrite(5,0);
  digitalWrite(0,0);
  delay(1000);  
}
void back()
{
   digitalWrite(4, 1);
   digitalWrite(2,1);
  delay(2000);
  digitalWrite(2,0);
  digitalWrite(4,0);
  delay(1000);   
}

void right()
{
    digitalWrite(2, 1);
    digitalWrite(5,1);
  delay(2000);
  digitalWrite(2,0);
  digitalWrite(5,0);
  delay(1000);   
}

void left()
{
    digitalWrite(0,1);
    digitalWrite(4,1);
  delay(2000);
  digitalWrite(0,0);
  digitalWrite(4,0);
  delay(1000);   
}
void setup() {
  delay(1000);
  Serial.begin(115200);
  Serial.println();
  Serial.print("Configuring access point...");
  WiFi.softAP(ssid, password);
  pinMode(2, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(0, OUTPUT);
  pinMode(4, OUTPUT);
  IPAddress myIP = WiFi.softAPIP();
  Serial.print("AP IP address: ");
  Serial.println(myIP);
  server.on("/", handleRoot);
  server.on("/forward", forward);
  server.on("/", handleRoot);
  server.on("/back", back);
  server.on("/", handleRoot);
  server.on("/right", right);
  server.on("/", handleRoot);
  server.on("/left", left);
  server.begin();
  Serial.println("HTTP server started");
}
void loop() {
  Serial.println("Waiting for the link");
  server.handleClient();
}
//////////////////AMAAN JAVED////////////////////

Credits

Amaan Javed

19 projects • 4 followers

Student

M5Stack ROBOT with NodeMCU and MPU6050

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

M5Stack(client):

MPU6050:

NodeMCU(server):

HOW TO CONTROL:

library:

Action:

Code

M5STACK ROBOT

NodeMCU (on board com)

Credits

Amaan Javed

Comments

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M5Stack ROBOT with NodeMCU and MPU6050

M5Stack ROBOT with NodeMCU and MPU6050

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

M5Stack(client):

MPU6050:

NodeMCU(server):

HOW TO CONTROL:

library:

Action:

Code

M5STACK ROBOT

NodeMCU (on board com)

Credits

Amaan Javed

Comments

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