read ADC in one step and adjust calculation (most probably it doesn't

make much of a difference)

libraries/Tiny/TinySensor.h

@@ -35,15 +35,11 @@ protected:
 
 		delay(2); // Wait for Vref to settle
 		ADCSRA |= _BV(ADSC); // Start conversion
-		while (bit_is_set(ADCSRA, ADSC))
-			; // measuring
+		while (bit_is_set(ADCSRA, ADSC)); // measuring
 
-		uint8_t low = ADCL; // must read ADCL first - it then locks ADCH
-		uint8_t high = ADCH; // unlocks both
+		uint16_t result = ADC; // read ADC in one step
 
-		long result = (high << 8) | low;
-
-		result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
+		result = 1126400L / result; // Calculate Vcc (in mV); 1126400 = 1.1*1024*1000
 		return result; // Vcc in millivolts
 	}