Smart Port

[marwand]

Hello jcheger,

This is more of a question than an issue and I apologize for contacting you this way. I was wondering if the arduino can read rpm without having the smart port connected. I have an eagle tree brushless rpm sensor and everything is connected according to the diagram provided (except the smart port) and I'm getting no output from the arduino. I suspect that the smart port is needed because of the line [FrskySP FrskySP (10, 11);]. Also, is all the decoding happening through the smart port? Is there any way around it? Finally, can I get more information about the smart port?

Thank you very much & I appreciate your help.

[jcheger]

Hi marwand,

The smartport use a cyclic pull of addresses, which triggers the answer.
But you don't want this.

The EagleTree RPM sensor gives a pulse at every rotation. It is very
basic, as any hall effect or optical sensor does.

Here is some part of code I did write for a simple RPM counter. I've
modified it to print the RPM on serial once per second. I think it will
fit better you needs.

Regards, Jean-Christophe Heger

#define RPM_PIN 2

unsigned long sum = 0;
unsigned long count = 0;

void setup() {
Serial.begin (115200);
pinMode (RPM_PIN, INPUT);
attachInterrupt (0, rpmISR, RISING);
}

void loop() {
float freq;
unsigned int rpm;

delay (1000);
detachInterrupt (0);

freq = (sum) ? ((float) count * 1000000.0 / (float) sum) : 0.0;
rpm = int (freq * 6.0) * 10;
Serial.println (rpm);
sum = 0;
count = 0;

attachInterrupt (0, rpmISR, RISING);
}

void rpmISR () {
static unsigned long last_micros = 0;

if (last_micros) {
sum += micros () - last_micros;
count++;
}

last_micros = micros ();
}

Le 24. 12. 15 12:04, marwand a écrit :

Hello jcheger,

This is more of a question than an issue and I apologize for
contacting you this way I was wondering if the arduino can read rpm
without having the smart port connected I have an eagle tree brushless
rpm sensor and everything is connected according to the diagram
provided (except the smart port) and I'm getting no output from the
arduino I suspect that the smart port is needed because of the line
[FrskySP FrskySP (10, 11);] Also, is all the decoding happening
through the smart port? Is there any way around it? Finally, can I get
more information about the smart port?

Thank you very much & I appreciate your help

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[marwand]

Thanks a lot man. Hope you're enjoying your holidays!