![]() It is advised to disable the respective digital input buffer when using a pin for analog input in order to reduce power consumption by the digital input buffer. Setting a bit to ‘1’ will disable the corresponding data input buffer. DIDR0 and DIDR2 – Digital Input Disable registers The Atmel ATmega32U4 datasheet incorrectly indicates that MUX5 and ADTS3 are read-only. ADCSRB – ADC Control and Status Register B ![]() The 16MHz clock speed is divided by 128 so ADC conversion runs at 125 KHz. The ADC is enabled and the division factor for the prescaler is set to 128. Enables interrupt when a conversion is complete.įor the Micro, this register is initialized differently than the ATmega32U4 default.Sets the conversion clocking frequency of the prescaler.One bit is used to justify, left or right, the measurement results in the ADC’s output registers.ĪDCSRA – ADC Control and Status Register A.Contains 5 of the 6 MUX bits used to select the channel to be measured.Reference selection (AREF, VCC or 2.56V).For our purposes, we will discuss only single-ended measurement.įor more detail refer to Atmel’s documentation for ATmega32U4. The ADC is capable of making single-ended or differential measurements. The ATmega32U4 ADC can be controlled by the use of five 8-bit registers. The micro has a dedicated channel for making this measurement. The advantage of measuring VCC internally is that doing so will not require using a pin on the Micro. Measuring VCC might be necessary if your Arduino project runs on battery, primarily, or as a backup power source. I found many errors in Atmel’s documentation so let me clear up some of the misconceptions Why measure VCC? Using the ADC (Analog to Digital Converter) in the ATmega32U4 is simpler than the Atmel documentation seems. Trying to find sound examples of this was difficult so I took the time to do the research and perform tests so you will have the real data and an example.
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