Read analog Inputs via I2C Connection

Projects Networking, Protocols, and Devices
3

You can't read them all simultaneously. You need to multiplex and read them one at a time. For example:

ISR(ADC_vect) {
	if (ADMUX == 0x00) {
		result1 = ADCL | (ADCH << 8);
		ADMUX = 0x01;
	}
	else if (ADMUX == 0x01) {
		result2 = ADCL | (ADCH << 8);
		ADMUX = 0x00;
	}
	
	/* Start the next conversion */
	ADCSRA |= (1 << ADSC);
}