Display RPM using an IR proximity sensor

Community Help With My Project
2

do not place publish code in the main loop. Sending MQTT messages within rate limits

change to:

 void loop() {

if (millis() - timeold == measuretime)
{ 
Cayenne.loop();
detachInterrupt(digitalPinToInterrupt(5));
rpm=rev*(60000/measuretime);
Serial.println(rpm, DEC);
rev=0;
timeold=millis();
attachInterrupt(digitalPinToInterrupt(5),RPMcount,FALLING);
}

i am not sure whether this will work, but give it a try.

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