> For the complete documentation index, see [llms.txt](https://px4.gitbook.io/px4-user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://px4.gitbook.io/px4-user-guide/drone_parts/flight_controller/autopilot_discontinued/holybro_pix32.md).

# Holybro pix32 (FMUv2)

:::warning PX4 does not manufacture this (or any) autopilot. Contact the [manufacturer](https://holybro.com/) for hardware support or compliance issues. :::

The Holybro® [pix32 autopilot](https://holybro.com/collections/autopilot-flight-controllers/products/pix32pixhawk-flight-controller) (also known as "Pixhawk 2", and formerly as HKPilot32) is based on the [Pixhawk®-project](https://pixhawk.org/) **FMUv2** open hardware design. This board is based on hardware version Pixhawk 2.4.6. It runs the PX4 flight stack on the [NuttX](https://nuttx.apache.org/) OS.

![pix32](/files/8fl3bi3jA0KNpuxkkVvl)

As a CC-BY-SA 3.0 licensed Open Hardware design, schematics and design files should be [available here](https://github.com/PX4/Hardware).

:::tip The Holybro pix32 is software compatible with the [3DR Pixhawk 1](/px4-user-guide/drone_parts/flight_controller/autopilot_discontinued/pixhawk.md). It is not connector compatible, but is otherwise physically very similar to the 3DR Pixhawk or mRo Pixhawk. :::

:::note This flight controller is [manufacturer supported](/px4-user-guide/drone_parts/flight_controller/autopilot_manufacturer_supported.md). :::

## Key Features

* Main System-on-Chip: [STM32F427](http://www.st.com/web/en/catalog/mmc/FM141/SC1169/SS1577/LN1789)
  * CPU: 32-bit STM32F427 Cortex® M4 core with FPU
  * RAM: 168 MHz/256 KB
  * Flash: 2 MB
* Failsafe System-on-Chip: STM32F103
* Sensors:
  * ST Micro L3GD20 3-axis 16-bit gyroscope
  * ST Micro LSM303D 3-axis 14-bit accelerometer / magnetometer
  * Invensense® MPU 6000 3-axis accelerometer/gyroscope
  * MEAS MS5611 barometer
* Dimensions/Weight
  * Size: 81x44x15mm
  * Weight: 33.1g
* GPS: u-blox® super precision Neo-7M with compass
* Input Voltage: 2~~10s (7.4~~37V)

### Connectivity

* 1x I2C
* 2x CAN
* 3.3 and 6.6V ADC inputs
* 5x UART (serial ports), one high-power capable, 2x with HW flow control
* Spektrum DSM / DSM2 / DSM-X® Satellite compatible input up to DX8 (DX9 and above not supported)
* Futaba® S.BUS compatible input and output
* PPM sum signal
* RSSI (PWM or voltage) input
* SPI
* External microUSB port
* Molex PicoBlade connectors

## Where to Buy

[shop.holybro.com](https://holybro.com/collections/autopilot-flight-controllers/products/pix32pixhawk-flight-controller)

### Accessories

* [Digital airspeed sensor](https://holybro.com/products/digital-air-speed-sensor)
* [Hobbyking® Wifi Telemetry](https://hobbyking.com/en_us/apm-pixhawk-wireless-wifi-radio-module.html)
* [HolyBro SiK Telemetry Radio (EU 433 MHz, US 915 MHz)](/px4-user-guide/drone_parts/peripherals/telemetry/sik_radio/holybro_sik_radio.md)

## Building Firmware

:::tip Most users will not need to build this firmware! It is pre-built and automatically installed by *QGroundControl* when appropriate hardware is connected. :::

To [build PX4](/px4-user-guide/development/getting_started/building_px4.md) for this target:

```
make px4_fmu-v2_default
```

## Debug Port

See [3DR Pixhawk 1 > Debug Ports](/px4-user-guide/drone_parts/flight_controller/autopilot_discontinued/pixhawk.md#debug-ports).

## Pinouts and Schematics

The board is based on the [Pixhawk project](https://pixhawk.org/) **FMUv2** open hardware design.

* [FMUv2 + IOv2 schematic](https://raw.githubusercontent.com/PX4/Hardware/master/FMUv2/PX4FMUv2.4.5.pdf) -- Schematic and layout

:::note As a CC-BY-SA 3.0 licensed Open Hardware design, all schematics and design files are [available](https://github.com/PX4/Hardware). :::

## Serial Port Mapping

| UART   | Device     | Port                  |
| ------ | ---------- | --------------------- |
| UART1  | /dev/ttyS0 | IO debug              |
| USART2 | /dev/ttyS1 | TELEM1 (flow control) |
| USART3 | /dev/ttyS2 | TELEM2 (flow control) |
| UART4  |            |                       |
| UART7  | CONSOLE    |                       |
| UART8  | SERIAL4    |                       |