Think you could send or post the zip file?

Thanks!
Angie

int aPinIn = 0; // Analogue Input on Arduino
int val = 0; // The raw analogue value
float Vout = 0.0; // Voltage at point between resistors
// (relative to ground)
float Vin = 5.0; // Vcc (5 Volts)
float Rknown = 10000.0; // The known resistor (10 kohms)
float Runknown = 0.0;
float U = 0.0;
float I = 0.0;

void setup(){

Serial.begin(9600);
digitalWrite(13, HIGH);

}

void loop(){

val = analogRead(aPinIn); // Read in val (0-1023)
Vout = (Vin/1024.0) * float(val); // Convert to voltage
U = Vin – Vout;
I = (U/Rknown);
Runknown = (Vout/I);
// Runknown = Rknown*((Vin/Vout) – 1); // Calculate Runknown

Serial.print(”Vout: “);
Serial.println(Vout); // Output everything
Serial.print(”R: “);
Serial.println(Runknown);

delay(1000); // delay for readability

}

Cheers,
Hafiz