Infrared Sensor State Change

Projects General Guidance
1

So I'm doing a project and I need to make a state change detection infrared sensor that can "sense" and recollect the data in a specific period of time before resetting again. Basically I need to do a tachometer with this sensor but I'm having difficulties making the program.

My program is currently as follows:

int rpm=0;
float t=0;

void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
pinMode(9,OUTPUT);
pinMode(A5,INPUT);
}

void loop() {
// put your main code here, to run repeatedly:

t=t+0.05;
if (V>2.00){
rpm=rpm+1;
}

else if (V<=2.00){
//tt=rpm;
rpm=0;
}
tf=60*tt/t;
Serial.print("RPM = ");
Serial.println(rpm);
Serial.print("Time = ");
Serial.println(t);
//delay(200);
}

2
  1. Use code tags.
  2. What is the question? (Are you looking for someone to write the code for you?)
3

I'm just looking for some direction to correctly make the code. Currently my code starts counting when there's something in front of it, I want my code to count when something passes in front of it not when there's something in it.

4

The problem isn't your code but how you're using the sensor!

5

How so?

6

Check out there: Digital Tachometer (RPM) using IR Sensor with Arduino

7

What is the sensor sensing? What range of RPM are you expecting? Which Arduino?

8

The sensor is sensing the time count a propeller is spent in front of the sensor, instead of how many revolutions this propeller does. As for the motor its a generic DC motor.

9

So, are you using a "gap" sensor and trying to count the blade tips passing through? Again, what RPM?

10

OK, What is the propeller blade width and what is the approximate angular velocity?

11

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