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# OtterPill
OtterPill is a 3$ STM32F072 devboard featuring USB 2.0 full-speed, a DFU Bootloader, a USB-PD Phy and Arduino nano alike pinout and size.
Changelog V1.2: BOM cost reduction by ~40%, PCB can be fully populated by JLCSMT, more efficient buck converter (PCB gets less warm at 20V), GND-hook for probing, Reset-Pin will be exposed as pad, power pads for 20V/5A
More documentation and firmware examples will be aviable soon (including pinout diagram).
## Building and Flashing
### Via Arduino
[You can build and flash the firmware via Arduino as described here.](https://github.com/stm32duino/Arduino_Core_STM32)
## Via Makefile and DFU
Or you can generate a basic firmware, with HAL init and Makefile, with CubeMX. The binary can then be build with make and flashed with dfu-utils. To enter DFU mode, press and hold the Button while plugging in power.
$ make
$ dfu-util -a 0 -s 0x08000000:leave -D build/firmware.bin
## USB-PD example firmware
This is a working USB-PD example using ChibiOS, a new voltage can be requested by pressing the Button.
[https://github.com/Jan--Henrik/USB-PD-Firmware](https://github.com/Jan--Henrik/USB-PD-Firmware)
## Images
### Rev 1.1
### Rev 1.2
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