40 lines
1.0 KiB
Arduino
40 lines
1.0 KiB
Arduino
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/* Program to measure the frequenncy of a input, on digital pin 8
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* Made by Oyvind Skaaden
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*/
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#include <FreqMeasure.h> // Library for measure
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#define out 4 // The pin the transistor is controlled by
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float rpm = 40000; // The limit for when to open the transistor
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bool ledUnderRPM = true; // Change this to light the LED should light when the rpm are over rpm
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float freq = rpm / 60;
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void setup() {
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Serial.begin(57600);
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FreqMeasure.begin();
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}
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double sum=0;
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int count=0;
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void loop() {
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if (FreqMeasure.available()) {
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// average several reading together
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sum = sum + FreqMeasure.read();
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count = count + 1;
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if (count > 30) {
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float frequency = FreqMeasure.countToFrequency(sum / count);
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Serial.print(frequency);
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if (frequency < freq) { // If the measured frequency is below the RPM do this
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digitalWrite(out, ledUnderRPM);
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Serial.println(" ON");
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}
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else{
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digitalWrite(out, !ledUnderRPM);
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Serial.println(" OFF");
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}
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sum = 0;
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count = 0;
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}
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}
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}
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