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Iot Based Gesture Controlled Robot Using Blynk App

Made by vinayyn / Robotics / Sensors / IoT

About the project

Project info

Difficulty: Moderate

Platforms: Android, Arduino, Blynk, NodeMCU

Estimated time: 2 hours

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

Items used in this project

Hardware components

	NodeMCU	x 1
	L298 Motor Driver	x 1
	DC Geared Motor 500 RPM	x 4
	Battery 12 Volt	x 1
	switch	x 1
	wheels	x 4
	Chasis size depends on your choice	x 1
	Lead-acid battery clips	x 2
	wires	x 1

View all

Software apps and online services

	Arduino ide for writing ,compiling and uploading the code
	Blynk app

Hand tools and fabrication machines

screwdrivers

x 1

Story

Making gesture-controlled robots using an accelerometer sensor like Adxl 335 is old tech. To control it require sensors and MCU and RF transmitter to be placed on the hand. On the other side, RF receiver MCU and other components are required. In our project, I have used the android Accelerometer sensor to control the movements of the robot. The axis variation data of the android phone is sent to the Node MCU using the Blynk app. Blynk app is connected to Node MCU via the internet. Node MCU Controls the movements of the motors by using a motor driver. We can control the device from all around the world using the Blynk app with internet connectivity.

Schematics, diagrams and documents

schematic diagram

Code

source code

#define BLYNK_PRINT Serial
#include <SoftwareSerial.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
char auth[] = "Your Blynk Auth ID ";
char ssid[] = "Your WI-FI Name";
char pass[] = "Your WI-FI Password";
const int ml1 = D1;
const int ml2 = D2;
const int mr1 = D3;
const int mr2 = D4;
void setup()
{
  pinMode(ml1, OUTPUT);
  pinMode(ml2,OUTPUT);
  pinMode(mr1, OUTPUT);
  pinMode(mr2,OUTPUT);
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);
}
void loop()
{
Blynk.run();
}
BLYNK_WRITE(V1)
{
int x = param[0].asFloat(); //acceleration force applied to axis x
int y = param[1].asFloat(); //acceleration force applied to axis y
int z = param[2].asFloat();//acceleration force applied to axis y
/*x = map(x, -10, 10, 255, -255);
y = map(y, -10, 10, 255, -255);
z = map(z, -10, 10, 255, -255);*/
Serial.print("x axis:");
Serial.println(x);
Serial.print("y axis:");
Serial.println(y);
Serial.print("z axis:");
Serial.println(z);
if(y==0&&x==0)
{
digitalWrite(ml1, HIGH);//stop
digitalWrite(ml2, HIGH);
digitalWrite(mr1, HIGH);
digitalWrite(mr2, HIGH);
}
else if(y<0)
{
 digitalWrite(ml1, HIGH);//forward
digitalWrite(ml2, LOW);
digitalWrite(mr1, HIGH);
digitalWrite(mr2, LOW);
}
else if(z<6)
{
 digitalWrite(ml1, LOW);//reverse
digitalWrite(ml2, HIGH);
digitalWrite(mr1, LOW);
digitalWrite(mr2, HIGH);
}
else if(x>1)
{
 digitalWrite(ml1,HIGH);
digitalWrite(ml2, LOW);//right
digitalWrite(mr1, LOW);
digitalWrite(mr2, HIGH); 
}
else if(x<0)
{
digitalWrite(ml1,LOW);
digitalWrite(ml2, HIGH);
digitalWrite(mr1, HIGH);//left
digitalWrite(mr2, LOW);
}
else
{

}
}

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Iot Based Gesture Controlled Robot Using Blynk App

About the project

Project info