# CUAV Pixhack v3 (FMUv3)

:::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® 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® (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](https://4155462212-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-LArEa7z2SPawfl3HpCD%2Fuploads%2Fgit-blob-759a9f46b2335861f6e52137679ad2c3ecd5d707%2Fpixhack_v3_157_large_default.jpg?alt=media)

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

## 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:

* [store.cuav.net](http://store.cuav.net/index.php?id_product=8\&id_product_attribute=0\&rewrite=pixhack-v3-autopilot\&controller=product\&id_lang=3)
* [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](https://px4.gitbook.io/px4-user-guide/development/getting_started/building_px4) for this target:

```
make px4_fmu-v3_default
```

## Pinouts and Schematics

* [Documentation/wiring guides](http://doc.cuav.net/flight-controller/pixhack/en/pixhack-v3.html)

## 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    |                       |


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