Arduino based RPM counter with a new and faster algorithm

This project makes use of the preciseness of a laser beam, just one IR sensor and that good old arduino board to measure the RPM of motors.

Apr 30, 2020

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9 respects

environmental sensing

data collection

Devices & Components

Arduino Uno Rev3

USB-A to Mini-USB Cable

Jumper wires (generic)

Laser Diode, 655 nm

IR proximity sensor

DC motor (generic)

Battery, 9 V

Hardware & Tools

Solder Wire, Lead Free

Soldering iron (generic)

Software & Tools

Arduino IDE

Project description

Code

RPM_counter_101

arduino

This is the code for the RPM counter.

1//code by YaSh.
2
3int sen = A0;
4const float wid = 0.012;   //adjust   the width of the fan blade according to your needs.
5const float rad = 0.045;    //adjust the radius of the point of detection in the fan blade.
6const float   konst = 6.2832;  //  2*pi.
7float time_1;
8float time_2;
9float vel;
10float   diff;
11float tnet;
12float rpm;
13void setup() 
14{
15  Serial.begin(9600);
16   pinMode(sen,INPUT);
17  Serial.print(" \
18 please start the motor at least 3   seconds prior.\
19");
20  delay(3000);
21}
22void loop()
23{
24  if(analogRead(sen)<950)
25   {
26    time_1 = millis();
27    delay(30);
28  }
29  if(analogRead(sen)>950)
30   {
31    time_2 = millis();
32    diff = (time_2-time_1);         
33    vel   = wid/diff;                      //rotation velocity
34    tnet = (konst*rad)/vel;               //time = (2*pi*radius)/velocity.
35    rpm = (60000)/tnet;                //   time in ms to minutes and then to rpm conversion step.
36  }
37Serial.print("\
38   The rpm is : "); 
39Serial.println( rpm );
40}

//code by YaSh.

int sen = A0;
const float wid = 0.012;   //adjust   the width of the fan blade according to your needs.
const float rad = 0.045;    //adjust the radius of the point of detection in the fan blade.
const float   konst = 6.2832;  //  2*pi.
float time_1;
float time_2;
float vel;
float   diff;
float tnet;
float rpm;
void setup() 
{
  Serial.begin(9600);
   pinMode(sen,INPUT);
  Serial.print(" \
 please start the motor at least 3   seconds prior.\
");
  delay(3000);
}
void loop()
{
  if(analogRead(sen)<950)
   {
    time_1 = millis();
    delay(30);
  }
  if(analogRead(sen)>950)
   {
    time_2 = millis();
    diff = (time_2-time_1);         
    vel   = wid/diff;                      //rotation velocity
    tnet = (konst*rad)/vel;               //time = (2*pi*radius)/velocity.
    rpm = (60000)/tnet;                //   time in ms to minutes and then to rpm conversion step.
  }
Serial.print("\
   The rpm is : "); 
Serial.println( rpm );
}

RPM_counter_101

arduino

This is the code for the RPM counter.

1//code by YaSh.
2
3int sen = A0;
4const float wid = 0.012;   //adjust  the width of the fan blade according to your needs.
5const float rad = 0.045;   //adjust the radius of the point of detection in the fan blade.
6const float  konst = 6.2832;  //  2*pi.
7float time_1;
8float time_2;
9float vel;
10float  diff;
11float tnet;
12float rpm;
13void setup() 
14{
15  Serial.begin(9600);
16  pinMode(sen,INPUT);
17  Serial.print(" \
18 please start the motor at least 3  seconds prior.\
19");
20  delay(3000);
21}
22void loop()
23{
24  if(analogRead(sen)<950)
25  {
26    time_1 = millis();
27    delay(30);
28  }
29  if(analogRead(sen)>950)
30  {
31    time_2 = millis();
32    diff = (time_2-time_1);         
33    vel  = wid/diff;                      //rotation velocity
34    tnet = (konst*rad)/vel;              //time = (2*pi*radius)/velocity.
35    rpm = (60000)/tnet;                //  time in ms to minutes and then to rpm conversion step.
36  }
37Serial.print("\
38  The rpm is : "); 
39Serial.println( rpm );
40}

//code by YaSh.

int sen = A0;
const float wid = 0.012;   //adjust  the width of the fan blade according to your needs.
const float rad = 0.045;   //adjust the radius of the point of detection in the fan blade.
const float  konst = 6.2832;  //  2*pi.
float time_1;
float time_2;
float vel;
float  diff;
float tnet;
float rpm;
void setup() 
{
  Serial.begin(9600);
  pinMode(sen,INPUT);
  Serial.print(" \
 please start the motor at least 3  seconds prior.\
");
  delay(3000);
}
void loop()
{
  if(analogRead(sen)<950)
  {
    time_1 = millis();
    delay(30);
  }
  if(analogRead(sen)>950)
  {
    time_2 = millis();
    diff = (time_2-time_1);         
    vel  = wid/diff;                      //rotation velocity
    tnet = (konst*rad)/vel;              //time = (2*pi*radius)/velocity.
    rpm = (60000)/tnet;                //  time in ms to minutes and then to rpm conversion step.
  }
Serial.print("\
  The rpm is : "); 
Serial.println( rpm );
}

Downloadable files

Circuit Schematics

schematic for connecting sensor to the arduino board

Circuit Schematics

schematic for connecting sensor to the arduino board

Circuit Schematics

Setup image.

this is the image for the base and other components placement

Setup image.

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