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# ADC Driver

QMK can leverage the Analog-to-Digital Converter (ADC) on supported MCUs to measure voltages on certain pins. This can be useful for implementing things such as battery level indicators for Bluetooth keyboards, or volume controls using a potentiometer, as opposed to a [rotary encoder](feature_encoders.md).

This driver currently supports both AVR and a limited selection of ARM devices. The values returned are 10-bit integers (0-1023) mapped between 0V and VCC (usually 5V or 3.3V for AVR, 3.3V only for ARM), however on ARM there is more flexibility in control of operation through `#define`s if you need more precision.

## Usage

To use this driver, add the following to your `rules.mk`:

```make
SRC += analog.c
```

Then place this include at the top of your code:

```c
#include "analog.h"
```

## Channels

### AVR

|Channel|AT90USB64/128|ATmega16/32U4|ATmega32A|ATmega328/P|
|-------|-------------|-------------|---------|----------|
|0      |`F0`         |`F0`         |`A0`     |`C0`      |
|1      |`F1`         |`F1`         |`A1`     |`C1`      |
|2      |`F2`         |             |`A2`     |`C2`      |
|3      |`F3`         |             |`A3`     |`C3`      |
|4      |`F4`         |`F4`         |`A4`     |`C4`      |
|5      |`F5`         |`F5`         |`A5`     |`C5`      |
|6      |`F6`         |`F6`         |`A6`     |*         |
|7      |`F7`         |`F7`         |`A7`     |*         |
|8      |             |`D4`         |         |          |
|9      |             |`D6`         |         |          |
|10     |             |`D7`         |         |          |
|11     |             |`B4`         |         |          |
|12     |             |`B5`         |         |          |
|13     |             |`B6`         |         |          |