# fantemp

Temperature-controlled fan firmware (ATmega328P, 16 MHz), rewritten on
[libavr](https://git.blackmark.me/avr/libavr): thermistor on ADC0 sampled
free-running and averaged over 1000 conversions, fan on OC0B at 50 kHz,
115200 Bd serial console (`help` lists the commands), temperature
histogram persisted to EEPROM, watchdog-reset path into a boot-section
bootloader.

The Steinhart–Hart math of the legacy firmware (runtime doubles + libm
log) is gone: the Beta equation and the cubic fan curve are evaluated
consteval into flash tables — the firmware itself never touches floating
point.

Build against a libavr checkout:

```sh
LIBAVR_ROOT=/path/to/libavr cmake --preset atmega328p-generated
cmake --build --preset atmega328p-generated
```

Legacy (yazoalfa submodules) stays on `master`.