A hand gesture-controlled toy which can move forward, backward, left and right and also detects obstacles.
sprint 1.1.jpg

The transmitter circuit

The Receiver

This is the car on which receiver circuit is embedded which receives the signal from the transmitter and accordingly the car moves.

sprint 2.1.jpg

The receiver circuit

    //Connect the Receiver data pin to Arduino pin 11

#include <VirtualWire.h>
byte message[VW_MAX_MESSAGE_LEN]; // a buffer to store the incoming messages
byte messageLength = VW_MAX_MESSAGE_LEN; // the size of the message

#define ep 4
#define tp 3
int en1=9;
int en2=10;
int in1=5;
int in2=6;
int in3=7;
int in4=8;
int buzzerPin=2;
int ledPin=13;//led on pin 13 is ON except when bot is stationary
long duration, distance;

void setup()
{ 
 Serial.begin(9600);//Initialise theserial connection debugging

 pinMode(tp,OUTPUT);
 pinMode(ep,INPUT);
 pinMode(ledPin,OUTPUT);
 pinMode(buzzerPin,OUTPUT);
 pinMode(en1,OUTPUT);
 pinMode(en2,OUTPUT);
 pinMode(in1,OUTPUT);
 pinMode(in2,OUTPUT);
 pinMode(in3,OUTPUT);
 pinMode(in4,OUTPUT);

 vw_setup(2000); // Bits per sec
 vw_rx_start(); // Start the receiver
}
void loop()
{

  digitalWrite(tp,LOW);
  delayMicroseconds(2);
  digitalWrite(tp,HIGH);
  delayMicroseconds(10);
  digitalWrite(tp,LOW);
  duration=pulseIn(ep,HIGH);
  distance=duration/58.2;
  Serial.println(distance);
  if (distance < 10 )
  {
    Serial.print("Obstacle detected\n");
    digitalWrite(buzzerPin,HIGH);
  }
  else
  {
    Serial.print("Obstacle not detected\n");
    digitalWrite(buzzerPin,LOW);
  }
    
    uint8_t buf[VW_MAX_MESSAGE_LEN];
    uint8_t buflen = VW_MAX_MESSAGE_LEN;

    if (vw_get_message(buf, &buflen)) // Non-blocking
    {
  int i;

  Serial.print("Got: ");//debugging
  
  for (i = 0; i < buflen; i++)
  {
     Serial.print(buf[i],HEX);//You may also use integer values debugging
     Serial.print(' ');// debugging

          if (buf[i]==0x6F)//Stationary
          {
            digitalWrite(en1,LOW);
            digitalWrite(in1,LOW);  
            digitalWrite(in2,LOW);
            digitalWrite(en2,LOW);
            digitalWrite(in3,LOW);
            digitalWrite(in4,LOW);
          Serial.print("Stationary");
            digitalWrite(ledPin,LOW);
          }
          else
          {
            if(buf[i]==0x68)//Forward
            {
              digitalWrite(en1,HIGH);
              digitalWrite(in1,LOW);  
              digitalWrite(in2,HIGH);
              digitalWrite(en2,HIGH);
              digitalWrite(in3,HIGH);
              digitalWrite(in4,LOW);
            Serial.print("Forward");  
              digitalWrite(ledPin,HIGH);
            }
          
            if (buf[i]==0x69)//Backward
            {
              digitalWrite(en1,HIGH);
              digitalWrite(in1,HIGH);  
              digitalWrite(in2,LOW);
              digitalWrite(en2,HIGH);
              digitalWrite(in3,LOW);
              digitalWrite(in4,HIGH);
            Serial.print("Backward");  
              digitalWrite(ledPin,HIGH);
          }
          
            if (buf[i]==0x62)//Right 
            {
              digitalWrite(en1,HIGH);
              digitalWrite(in1,LOW);  
              digitalWrite(in2,LOW);
              digitalWrite(en2,HIGH);
              digitalWrite(in3,HIGH);
              digitalWrite(in4,LOW);
              Serial.print("Right");
              digitalWrite(ledPin,HIGH);
            }
          
            if (buf[i]==0x65)//Left 
            {
              digitalWrite(en1,HIGH);
              digitalWrite(in1,LOW);  
              digitalWrite(in2,HIGH);
              digitalWrite(en2,HIGH);
              digitalWrite(in3,LOW);
              digitalWrite(in4,LOW);
              Serial.print("Left");
              digitalWrite(ledPin,HIGH);
            }
           }   
    }
    Serial.print("\n");// debugging
        }
        delay(100);
}
Ritbik Bharti


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