/* Potentiometer reading program */
// Constants
#define DELAY 500 // Delay between two measurements in ms
#define VIN 5 // V power voltage
#define R 10000 //ohm resistance value

// Parameters
const int sensorPin = D0; // Pin connected to sensor

//Variables
int sensorVal; // Analog value from the sensor
float res; //resistance value

void setup(void) {
 	Serial.begin(9600);
}

void loop(void) {
 	sensorVal = analogRead(sensorPin);
 	res=sensorRawToPhys(sensorVal);
 	Serial.print(F("Raw value from sensor= "));
 	Serial.println(sensorVal); // the analog reading
 	Serial.print(F("Physical value from sensor = "));
 	Serial.print(res); // the analog reading
 	Serial.println(F(" ohm")); // the analog reading
 	delay(DELAY);
}

float sensorRawToPhys(int raw){
 	// Conversion rule
 	float Vout = float(raw) * (VIN / float(1023));// Conversion analog to voltage
 	float phys = R *((Vout))/VIN; // Conversion voltage to resistance between GND and signal
 	float phys2 = R *((VIN - Vout))/VIN; // Conversion voltage to resistance between 5V and signal
 	return phys;
}