Arduino speed detector

Super easy project using an arduino uno to detect speed of various moving objects with the help of a pair of IR sensors and get the speed.

Apr 28, 2020

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environmental sensing

Components and supplies

Male/Female Jumper Wires

IR proximity sensor

Arduino UNO

USB-A to Mini-USB Cable

RGB Diffused Common Cathode

Apps and platforms

Arduino IDE

Project description

Code

speed_detection101

arduino

here's the code for the speed detector.just upload to arduino after doing the circuitry. sen1 is the first sensors .sen2 is the second.led pin is the pin to the RGB led.The seperation between my sensors was 7.5 cms. you can adjust the speedconst variable for the same.

1//code by YaSh.
2
3int sen1=A0;
4int sen2=A3;
5int ledPin=9;
6unsigned  long t1=0;
7unsigned long t2=0; 
8float velocity;
9float velocity_real;
10float  timeFirst;
11float timeScnd;
12float diff;
13float speedConst=7.5;  //in cm.
14void  setup()
15{
16  Serial.begin(9600);
17  pinMode(sen1,INPUT);
18  pinMode(sen2,INPUT);
19  analogWrite(11,LOW);
20  analogWrite(10,HIGH);
21}
22  void loop()
23  {
24    if (analogRead(sen1)<500 && analogRead(sen2)>500)
25    {
26      timeFirst  = millis();
27      digitalWrite(ledPin, LOW);
28      delay(30);
29    }
30  
31  if (analogRead(sen2)>500 && analogRead(sen1)<500)
32  {
33    timeScnd =  millis();
34    diff = timeScnd - timeFirst; 
35    velocity = speedConst / diff;
36    velocity_real = (velocity*360)/100;     //milliseconds to hours and centimetres  to kilometeres.
37    delay(30);
38    digitalWrite(ledPin, HIGH);
39  Serial.print("\
40  the velocity is : ");
41  Serial.println(velocity_real);
42  Serial.print("  km/hr. ");
43  delay(500);
44  digitalWrite(ledPin,LOW);
45  delay(500);
46  }
47  /*else if(analogRead(sen2)<500 && analogRead(sen1)<500)       //uncomment  if you want to write it.
48  {
49      Serial.print("\
50 Error:404/ the object  is tooo big.");
51  }*/
52 /* else{Serial.print("\
53 error:404/no object detected  ");}     //uncomment if you want to write it.*/
54  }

//code by YaSh.

int sen1=A0;
int sen2=A3;
int ledPin=9;
unsigned  long t1=0;
unsigned long t2=0; 
float velocity;
float velocity_real;
float  timeFirst;
float timeScnd;
float diff;
float speedConst=7.5;  //in cm.
void  setup()
{
  Serial.begin(9600);
  pinMode(sen1,INPUT);
  pinMode(sen2,INPUT);
  analogWrite(11,LOW);
  analogWrite(10,HIGH);
}
  void loop()
  {
    if (analogRead(sen1)<500 && analogRead(sen2)>500)
    {
      timeFirst  = millis();
      digitalWrite(ledPin, LOW);
      delay(30);
    }
  
  if (analogRead(sen2)>500 && analogRead(sen1)<500)
  {
    timeScnd =  millis();
    diff = timeScnd - timeFirst; 
    velocity = speedConst / diff;
    velocity_real = (velocity*360)/100;     //milliseconds to hours and centimetres  to kilometeres.
    delay(30);
    digitalWrite(ledPin, HIGH);
  Serial.print("\
  the velocity is : ");
  Serial.println(velocity_real);
  Serial.print("  km/hr. ");
  delay(500);
  digitalWrite(ledPin,LOW);
  delay(500);
  }
  /*else if(analogRead(sen2)<500 && analogRead(sen1)<500)       //uncomment  if you want to write it.
  {
      Serial.print("\
 Error:404/ the object  is tooo big.");
  }*/
 /* else{Serial.print("\
 error:404/no object detected  ");}     //uncomment if you want to write it.*/
  }

speed_detection101

arduino

1//code by YaSh.
2
3int sen1=A0;
4int sen2=A3;
5int ledPin=9;
6unsigned   long t1=0;
7unsigned long t2=0; 
8float velocity;
9float velocity_real;
10float   timeFirst;
11float timeScnd;
12float diff;
13float speedConst=7.5;  //in cm.
14void   setup()
15{
16  Serial.begin(9600);
17  pinMode(sen1,INPUT);
18  pinMode(sen2,INPUT);
19   analogWrite(11,LOW);
20  analogWrite(10,HIGH);
21}
22  void loop()
23  {
24     if (analogRead(sen1)<500 && analogRead(sen2)>500)
25    {
26      timeFirst   = millis();
27      digitalWrite(ledPin, LOW);
28      delay(30);
29    }
30   
31  if (analogRead(sen2)>500 && analogRead(sen1)<500)
32  {
33    timeScnd =   millis();
34    diff = timeScnd - timeFirst; 
35    velocity = speedConst / diff;
36     velocity_real = (velocity*360)/100;     //milliseconds to hours and centimetres   to kilometeres.
37    delay(30);
38    digitalWrite(ledPin, HIGH);
39  Serial.print("\
40   the velocity is : ");
41  Serial.println(velocity_real);
42  Serial.print("   km/hr. ");
43  delay(500);
44  digitalWrite(ledPin,LOW);
45  delay(500);
46   }
47  /*else if(analogRead(sen2)<500 && analogRead(sen1)<500)       //uncomment   if you want to write it.
48  {
49      Serial.print("\
50 Error:404/ the object   is tooo big.");
51  }*/
52 /* else{Serial.print("\
53 error:404/no object detected   ");}     //uncomment if you want to write it.*/
54  }

//code by YaSh.

int sen1=A0;
int sen2=A3;
int ledPin=9;
unsigned   long t1=0;
unsigned long t2=0; 
float velocity;
float velocity_real;
float   timeFirst;
float timeScnd;
float diff;
float speedConst=7.5;  //in cm.
void   setup()
{
  Serial.begin(9600);
  pinMode(sen1,INPUT);
  pinMode(sen2,INPUT);
   analogWrite(11,LOW);
  analogWrite(10,HIGH);
}
  void loop()
  {
     if (analogRead(sen1)<500 && analogRead(sen2)>500)
    {
      timeFirst   = millis();
      digitalWrite(ledPin, LOW);
      delay(30);
    }
   
  if (analogRead(sen2)>500 && analogRead(sen1)<500)
  {
    timeScnd =   millis();
    diff = timeScnd - timeFirst; 
    velocity = speedConst / diff;
     velocity_real = (velocity*360)/100;     //milliseconds to hours and centimetres   to kilometeres.
    delay(30);
    digitalWrite(ledPin, HIGH);
  Serial.print("\
   the velocity is : ");
  Serial.println(velocity_real);
  Serial.print("   km/hr. ");
  delay(500);
  digitalWrite(ledPin,LOW);
  delay(500);
   }
  /*else if(analogRead(sen2)<500 && analogRead(sen1)<500)       //uncomment   if you want to write it.
  {
      Serial.print("\
 Error:404/ the object   is tooo big.");
  }*/
 /* else{Serial.print("\
 error:404/no object detected   ");}     //uncomment if you want to write it.*/
  }

Downloadable files

Test_Video

A Video showcasing a test run of the project. the speed gets printed in the serial monitor.

Test_Video

A Video showcasing a test run of the project. the speed gets printed in the serial monitor.

Test_Video

here is the circuit schematic

the wires are a bit jumbled. And use the IR sensors whose link is given in the components section and not the one in the CAD.

here is the circuit schematic

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