void main() {
	adc_init();
	DDRA &= ~((1 << PA0) | (1 << PA1));
	DDRB |= (1 << PB0);
	while (1) {
		uint16_t counter = 50000;
		uint8_t refBit = 3;
		while (counter > 0) {
			counter--;
			refBit &= 1 + ((PINA & (1 << PA1)) >> 1);
			delay(39);
		}
		// is the refBit 1 or 2? => maskBit is 1 else 0
		uint8_t maskBit = (refBit & 1 | (refBit >> 1) & 1);
		PORTB = PORTB & ~(maskBit << PB0);

		uint16_t strangeWaterLevelValue = get_adc();
		if (strangeWaterLevelValue < 100)
			PORTB = PORTB & ~(1 << PB0);
	}
}