Arduino code example for Mikroe C-meter click

c-meter-arduino.ino

// C-meter click is installed in socket #1
// of Arduino Uno click shield
// Pulses will be applied on pin D2
int pin = 2;
// We compute on float
float period;
float Cx;
unsigned long pulse;
 
void setup()
{
  Serial.begin(9600);
  pinMode(pin, INPUT);
}
 
void loop()
{
  period = 0;
  // We compute the average of four measurements
  // one of the reasons I choose float
  Serial.println("Measurements");
  // Measure first period
  pulse= pulseIn(pin, HIGH, 100000000UL);
  Serial.println(pulse);
  if (pulse ==0){
    Serial.println("Pulse too long. reverting to pulseInLong()");
    pulse= pulseInLong(pin, HIGH, 1000000000);
    Serial.println(pulse);
  }
  period += pulse;
  pulse = pulseIn(pin, LOW, 100000000UL);
  if (pulse ==0){
    Serial.println("Pulse too long. reverting to pulseInLong()");
    pulse= pulseInLong(pin, HIGH, 1000000000);
    Serial.println(pulse);
  }
  period += pulse;
  // Measure second period
  pulse= pulseIn(pin, HIGH, 100000000UL);
  Serial.println(pulse);
  if (pulse ==0){
    Serial.println("Pulse too long. reverting to pulseInLong()");
    pulse= pulseInLong(pin, HIGH, 100000000UL);
    Serial.println(pulse);
  }
  period += pulse;
  pulse = pulseIn(pin, LOW, 100000000UL);
  if (pulse ==0){
    Serial.println("Pulse too long. reverting to pulseInLong()");
    pulse= pulseInLong(pin, HIGH, 100000000UL);
    Serial.println(pulse);
  }
  period += pulse;
  // Measure third period
  pulse= pulseIn(pin, HIGH, 100000000UL);
  Serial.println(pulse);
  if (pulse ==0){
    Serial.println("Pulse too long. reverting to pulseInLong()");
    pulse= pulseInLong(pin, HIGH, 100000000UL);
    Serial.println(pulse);
  }
  period += pulse;
  pulse = pulseIn(pin, LOW, 100000000UL);
  if (pulse ==0){
    Serial.println("Pulse too long. reverting to pulseInLong()");
    pulse= pulseInLong(pin, HIGH, 100000000UL);
    Serial.println(pulse);
  }
  period += pulse;
  // Measure fourth period
  pulse= pulseIn(pin, HIGH, 100000000UL);
  Serial.println(pulse);
  if (pulse ==0){
    Serial.println("Pulse too long. reverting to pulseInLong()");
    pulse= pulseInLong(pin, HIGH, 100000000UL);
    Serial.println(pulse);
  }
  period += pulse;
  pulse = pulseIn(pin, LOW, 100000000UL);
  if (pulse ==0){
    Serial.println("Pulse too long. reverting to pulseInLong()");
    pulse= pulseInLong(pin, HIGH, 100000000UL);
    Serial.println(pulse);
  }
  period += pulse;    
 
  // We divide only by four, as the above code measures 
  // Th and Tl separately
  // and one period T = Th + Tl
  period = period / 4;
  Serial.print("Period is: ");
  Serial.print(period);
  Serial.println(" us");
  Serial.print("Frequency is: ");
  Serial.print(1000000/period);
  Serial.println(" kHz");  
  Serial.println("");    
  Cx = period * 1000 / 77816;
  Serial.print("Capacity is: ");
  Serial.print(Cx);
  Serial.println(" uF");
  Serial.println("");   
  delay(1000);
}