#include <FreqCounter.h>float frq;int freq1;int pinLed=13;void setup() { pinMode(pinLed, OUTPUT); Serial.begin(9600); // connect to the serial port Serial.println("Frequency Counter");}void loop() { // wait if any serial is going on FreqCounter::f_comp=10; // Cal Value / Calibrate with professional Freq Counter FreqCounter::start(1000); // 1000 ms Gate Time while (FreqCounter::f_ready == 0) frq=FreqCounter::f_freq; Serial.print(" Freq: "); Serial.println(frq); freq1=(frq*0.428989)+0.944195; if(freq1<=0.944195) freq1=0; Serial.println(freq1); delay(20); digitalWrite(pinLed,!digitalRead(pinLed)); // blink Led}