Den Wert kann man in der Datei asuro.c am Ende der Funktion PollSwitch() finden:

Code:
/* function to read out switches */
unsigned char PollSwitch (void)
{
	unsigned int i;
	int ec_bak=autoencode;
	autoencode=FALSE;
	DDRD |= SWITCHES;				// Switches as Output
	SWITCH_ON;						// Output HIGH for measurement
	ADMUX = (1 << REFS0) | SWITCH;	// AVCC reference with external capacitor
	Sleep(10);

	ADCSRA |= (1 << ADSC);			// Start conversion
	while (!(ADCSRA & (1 << ADIF)));// wait for conversion complete
	ADCSRA |= (1 << ADIF);			// clear ADCIF
	i = ADCL + (ADCH << 8);

	SWITCH_OFF;
	Sleep(5);
	autoencode=ec_bak;
	//return  ((unsigned char) ((( 1024.0/(float)i - 1.0)) * 61.0 + 0.5));
	//return ((10240000L/(long)i-10000L)*61L+5000L)/10000;
	return ((10240000L/(long)i-10000L)*63L+5000L)/10000;
}
(Aus asuro.c v2.3)

Nach dem Ändern die Datei speichern und das Projekt kompilieren (Make all)