It doesn't work

Created Mon, 23 Nov 2015 23:31:53 +0000 by Ganky

Ganky

Mon, 23 Nov 2015 23:31:53 +0000

Hi, I am trying to do a Tachometer with a ChipKIT Uno32 board. When a rotor is set between the IR LED and the reciever, it counts the RPM. I have this at the moment:

int val;
long last=0;
int stat=LOW;
int stat2;
int contar=0;

int sens=75;  

int nPalas=1; 

int milisegundos=500; 
void setup()
{
  Serial.begin(9600);
}

void loop()
{
  val=analogRead(0);
  if(val<sens) {
    stat=LOW;
  }
   else {
    stat=HIGH;
   }

   if(stat2!=stat){  
     contar++;
     stat2=stat;
   }
   if(millis()-last>=milisegundos){
     double rps=((double)contar/nPalas)/2.0*1000.0/milisegundos;
     double rpm=((double)contar/nPalas)/2.0*60000.0/(milisegundos);
     Serial.print(rps);
     Serial.print(" RPS ");
     Serial.print(rpm);
     Serial.println(" RPM");
      
     contar = 0;
     last = millis();
   }
}

I have the problem that the serial doesn't detect any signal:

I have Windows 10 (if it is important)

What can I do?

Thanks.

majenko

Tue, 24 Nov 2015 00:00:01 +0000

You're using analogRead(0) yet you have your green wire connected in to digital pin 0. Instead it should be connected to analog pin 0.

Ganky

Tue, 24 Nov 2015 20:35:59 +0000

OK, I tried changing that and it works now. Thank you so much majenko!

EmbeddedMan

Tue, 24 Nov 2015 20:48:02 +0000

This is one of those times that a serious problem was almost immediately and correctly solved by another user (Majenko - thanks!) just looking at a set of complete and clear pictures of the setup. Thank you for posting those! I don't know how many times people asking me questions about things not working were solved by looking at how they had things all connected.

*Brian