# CUAV Pixhack V3 (Discontinued)

<Badge type="info" text="Discontinued" />

:::warning
This flight controller has been [discontinued](../flight_controller/autopilot_experimental.md) and is no longer commercially available.
:::

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

The CUAV _Pixhack V3_ flight controller board is a flexible autopilot intended primarily for manufacturers of commercial systems.

The board is a variant of the SOLO Pixhawk<sup>&reg;</sup> 2 (PH2) flight controller, which is in turn based on the [Pixhawk-project](https://pixhawk.org/) **FMUv3** open hardware design.
It runs PX4 on the [NuttX](https://nuttx.apache.org/) OS, and is fully compatible with both PX4 or ArduPilot<sup>&reg;</sup> (APM) firmware.

_Pixhack V3_ has significant improvements with respect to the original design, including better interface layout and the addition of vibration damping and a thermostat system.

![Pixhack v3](../../assets/flight_controller/pixhack_v3/pixhack_v3_157_large_default.jpg)

::: info
This flight controller is [manufacturer supported](../flight_controller/autopilot_manufacturer_supported.md).
:::

## Quick Summary

- Microprocessor:
  - STM32F427
  - STM32F100 (Failsafe co-processor)
- Sensors:
  - Accelerometers (3): LS303D, MPU6000, MPU9250/hmc5983
  - Gyroscopes (3): L3GD20, MPU6000, MPU9250
  - Compass (2): LS303D, MPU9250
  - Barometer (2): MS5611 X2
- Interfaces:
  - MAVLink UART (2)
  - GPS UART (2)
  - DEBUG UART (1)
  - RC IN (for PPM, SBUS, DSM/DSM2)
  - RSSI IN: PWM OR 3.3ADC
  - I2C (2)
  - CAN BUS (1)
  - ADC IN: 3.3V X1 , 6.6V X1
  - PWM OUT: 8 PWM IO + 4 IO
- Power System:
  - PM POWER IN: 4.5 ~ 5.5 V
  - USB POWER IN: 5.0 V +- 0.25v
- Weight and Dimensions:
  - Weight: 63g
  - Width: 68mm
  - Thickness: 17mm
  - Length: 44mm
- Other Characteristics:
  - Operating temperature: -20 ~ 60°C

## Availability

The board can be purchased from:

- [leixun.aliexpress.com/store](https://leixun.aliexpress.com/store)

## 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](../dev_setup/building_px4.md) for this target:

```sh
make px4_fmu-v3_default
```

<!-- Pinouts and Schematics: section removed as guides no longer published -->

## 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               |
