Wireless Automotive Blind Spot Detection System using RF module

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1

Hello everyone, i'm trying to create a wireless blind spot detection system using :

  1. Arduino Uno x 2
  2. Ultrasonic sensor
  3. 315Mhz rf module (transmitter and receiver)
  4. Button
  5. 1 LED
  6. Buzzer

the idea is :

  1. ultrasonic sensor detects object and rf transmitter sends signal to the receiver
  2. the receiver receives the signal and turns on the led light.
  3. if a button is pressed (indicating a turn signal if the driver failed to notice the led light), a buzzer will give out sound.

the problem :

both the buzzer and led is giving outputs when the sensor detects an object. the button doesnt seem to have any effect at all.

components placement :

1)first arduino

ultrasonic sensor

vcc to 5v
trig to pin 9
echo to pin 8
gnd to gnd

315 rf transmitter
vcc to 5v
gnd to gnd
data to pin 12

  1. second arduino

receiver
vcc to 5v
gnd to gnd
data to pin 12

led
pin 6
gnd

button
pin 2
gnd

buzzer
pin 3
gnd

these are my

( first arduino code)

#include <VirtualWire.h>
#include <Ultrasonic.h>
Ultrasonic ultrasonic(9,8); // (Trig PIN,Echo PIN)

int d;// Initialize the variable distance
char*controller;
void setup() {
  pinMode(6,OUTPUT);
vw_set_ptt_inverted(true); //
vw_set_tx_pin(12);
vw_setup(4000);// speed of data transfer Kbps
}

void loop(){

  char b[3]; //declaring character array

String str; //declaring string

d=ultrasonic.Ranging(CM);//cm o inc

if(d<10){
controller="1"  ;

}




vw_send((uint8_t *)controller, strlen(controller));
vw_wait_tx(); // Wait until the whole message is gone
digitalWrite(6,1);

controller="0"  ;
vw_send((uint8_t *)controller, strlen(controller));
vw_wait_tx(); // Wait until the whole message is gone
digitalWrite(6,0);


}

second arduino code

       #include <VirtualWire.h>



int button = 2; //Pin for button
int buzzer = 3; // Pin for buzzer
int led = 6; // Pin for LED
void setup()
{
    vw_set_ptt_inverted(true); // Required for DR3100
    vw_set_rx_pin(12);
    vw_setup(4000);  // Bits per sec
    pinMode(6, OUTPUT);// led
    pinMode(2, INPUT); //button is declared as input
pinMode(3, OUTPUT); //buzzer is declared as output

    vw_rx_start();       // Start the receiver PLL running
}
    void loop()
{
    uint8_t buf[VW_MAX_MESSAGE_LEN];
    uint8_t buflen = VW_MAX_MESSAGE_LEN;


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

  if(buf[0]=='1')
  {if (digitalRead(2)=='1');
   
  {
   digitalWrite(6,HIGH);
   digitalWrite(3, HIGH);}
  
    if(buf[0]=='1')
  {if (digitalRead(2)=='0');
   
  {
   digitalWrite(6,HIGH);
   digitalWrite(3, LOW);}
    
  }    else(buf[0]=='0');
{  digitalWrite(6,LOW);
  digitalWrite(3, LOW); }}
    }}

i would really appreciate any help and i hope you would have a nice day :slight_smile:

2

Did you test your ultra-sonic sensor on a vehicle moving at traffic speed on a multi-lane highway? How would it be able to discriminate the other vehicle from the noise?
Paul