#include
LiquidCrystal lcd(A5, A4, A3, A2, A1, A0);

#define serial

#define charge 3
#define freqIn 2
#define mode 10

#define Delay 15

double frequency, capacitance, inductance;

typedef struct
{
int flag: 1;
}Flag;

Flag Bit;

void setup()
{
#ifdef serial
Serial.begin(9600);
#endif
lcd.begin(16, 2);
pinMode(freqIn, INPUT);
pinMode(charge, OUTPUT);
pinMode(mode, INPUT_PULLUP);
lcd.print(" LC Meter Using ");
lcd.setCursor(0, 1);
lcd.print(" Arduino ");
delay(2000);
lcd.clear();
lcd.print("Circuit Digest");
delay(2000);
}

void loop()
{
for(int i=0;i 0.1)
frequency+= 1.E6 / (2 * Pulse);
delay(20);
}
frequency/=Delay;
#ifdef serial
Serial.print("frequency:");
Serial.print( frequency );
Serial.print(" Hz ");
#endif

lcd.setCursor(0, 0);
lcd.print("freq:");
lcd.print( frequency );
lcd.print(" Hz ");

if (Bit.flag)
{
inductance = 1.E-3;
capacitance = ((1. / (inductance * frequency * frequency * 4.*3.14159 * 3.14159)) * 1.E9);
if((int)capacitance < 0)
capacitance=0;
#ifdef serial
Serial.print("Capacitance:");
Serial.print( capacitance,6);
Serial.println(" uF ");
#endif
lcd.setCursor(0, 1);
lcd.print("Cap: ");
if(capacitance > 47)
{
lcd.print( (capacitance/1000));
lcd.print(" uF ");
}
else
{
lcd.print(capacitance);
lcd.print(" nF ");
}
}

else
{
capacitance = 0.1E-6;
inductance = (1. / (capacitance * frequency * frequency * 4.*3.14159 * 3.14159)) * 1.E6;
#ifdef serial
Serial.print("Ind:");
if(inductance>=1000)
{
Serial.print( inductance/1000 );
Serial.println(" mH");
}
else
{
Serial.print( inductance );
Serial.println(" uH");
}
#endif

lcd.setCursor(0, 1);
lcd.print("Ind:");
if(inductance>=1000)
{
lcd.print( inductance/1000 );
lcd.print(" mH ");
}
else
{
lcd.print( inductance );
lcd.print(" uH ");
}
}

if (digitalRead(mode) == LOW)
{
Bit.flag = !Bit.flag;
delay(1000);
while (digitalRead(mode) == LOW);
}
delay(50);
}