Category:Autopilots

Template:Autopilots

Hardware support for Autopilot versions currently in use.

One of the great advantages of Paparazzi is support for multiple hardware designs. The old Paparazzi board where based around ATMega MCUs. The current autopilots are designed around two primary processors:

• STM32 series microcontrollers
• LPC21xx series microcontrollers

There are active and current autopilots designs using both architectures. Not all autopilots have the same capabilities, peripherals or features, but each has advantages in different applications.

Currently, boards are designed around the STM32 microcontollers. Some of the autopilots use the STM32F1 and others the STM32F4 microcontrollers. This provides a wide range of choices resulting in a large variety of peripherals and speeds. Architecture-dependent firmware code is supported in part by libopencm3, as well as Chibi OS through the Paparazzi RT branch.

The LPC21xx based boards use the LPC2148 and have been flying fixed wing and multi-rotors for many years. This architecture is more mature but at the expense of speed and extra ports available on the newer STM32 series processors. The Tiny series, Booz, TWOG, YAPA, Umarim and NavGo autopilots all use the LPC2148.

Newer autopilots use either the STM32F1 or STM32F4 microcontrollers. You can choose from Lisa/M(X), Elle0, Krooz or Apogee autopilots, depending on your processing and IO needs.

Some autopilots have also been designed for close integration with small single-board computers, particularly those based on OMAP processors such as the Gumstix Overo series. The Lisa/L and Classix boards are designed with this in mind, though other autopilots can be easily interfaced. Further information can be found here. This also resulted in the ports of Paparazzi UAV to the Parrot AR Drone 2, Bebop and Rolling Spider airframes, that come with built in embedded Linux computers as their autopilot hardware.

A basic feature comparison table is presented to help in the autopilot hardware selection process.

For information regarding architecture and firmware compatibility of various subsystems and modules, please see the appropriate Subsystems overview and Modules List pages.

Schematics, CAD files, Gerber files, BOM release strategy

About the hardware development and release process.

Files needed to create the hardware can be found here. It is always good to remind oneself of the email Antoine once wrote in the mailing list before you want to start producing your own PCB's.

8 June 2011 13:25:47 Antoine Drouin wrote on the mailing list:

I've started this project together with Pascal 8 years ago and since then I have dedicated my time to try and make it successful. I'm utterly convinced of the benefits of open source, but observing how Paparazzi grew over time, I came to the conclusion that hardware is a bit different than software... "gcc tiny.brd" is not going to make a board magically appear on your desktop.

I'll list here some of my arguments in favor of releasing CAD files after the board is mature.

1. Unlike software, where an unskilled user can type make and get a piece of complex software to successfully build, assembling hardware requires tools and skills. Providing gerbers and BOM have lured a bunch of new users into believing otherwise and has created tons of frustration. I've myself fixed a number of badly assembled boards and I even recall that while helping debugging a board (so after assembly), discovering that the person had manufactured two layers PCBs instead of four layers. As the technology of the autopilot increases, this problem becomes more and more important.
2. The success of the project depends on the availability of affordable hardware. The price of hardware is directly and exponentially dependent on the number of manufactured units. If ten persons manufacture 10 boards each, the cost will be much higher than if one person manufactures 100.
3. Last and not least, the quality of assembly also depends very much on the number of manufactured units. Good quality can only be achieved through the use of automated placing and soldering, and those processes can only be used if the number of units reach a certain amount.

For the autopilot comparison table see below.