Tag Archives: Aspirin

Hardware

Lisa/M for developers

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Hello everyone,

After many months of hard work we have finally reached a version of Lisa/M that is ready for a wider range of developers. Although there are still some things missing that would allow a beginning user to use it with ease, we decided it is better to provide it to all of the other brilliant non core developers and users. You can find out more about it in the Paparazzi Wiki. A big thanks go to OpenUAS for his great help with the documentation.

And before you start asking, it is not fully Open-Hardware YET! The schematics are available in the SVN as well as in the Wiki. The eagle board layout files will follow soon.

Let us know what you plan to build with this autopilot. Also if you have built an aircraft with Lisa/L or Aspirin we would be very happy to see them. Just drop a comment below with a link to a picture. Let’s spread the word of what is possible with Paparazzi!!!

Let’s get flying!

Cheers Esden

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Hardware

Aspirin IMU Release

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Aspirin IMU on Booz Compatible Carrier BoardToday we are pleased to announce the public release of our next generation IMU, Aspirin! After a lengthy research, development, and testing period we are now happy with the hardware and the software drivers for this unique IMU. It is incredibly small and light, three digital sensors packed onto a single 19x14mm PCB. The footprint allows you to integrate it into your own designs too. We are also making it available via a carrier board for drop in use on Lisa/L.

Besides its small size Aspirin is cheaper then the Booz IMU you already know. The use of all digital sensors reduces size, cost and complexity while simplifying calibration.

Aspirin provides 9 degrees of measurement (DOM): 3 axis linear acceleration, 3 axis angular velocity, and 3 axis magnetic field measurement.

It consists of:

  • 3 axis accelerometer (ADXL345)
  • 3 axis gyroscope (IMU-3000)
  • 3 axis magnetometer (HMC5843)

This IMU is ready for the next generation Lisa/M autopilot that we wrote about before. The module fits directly on Lisa/M without the need of a carrier board.

We did not add an MCU on the board to save space, reduce cost, and improve latency behavior when connected to an autopilot. You have direct access to the sensor busses.

Aspirin uses the latest generation of Invensense 3 axis MEMS gyroscopes. IMU-3000’s advantage over other sensors (such as ITG-3200 found in similar IMU designs) is its selectable range. Selectable range allows the user to obtain maximum resolution and optimum performance, depending on vehicle dynamics and desired flight mode. No longer will it be necessary to limit vehicle dynamics to 300º/s, as Aspirin’s gyroscopes have a range of up to 2000º/s.

Here a small video of a Quad with Lisa/L autopilot with Aspirin IMU running Paparazzi rotorcraft firmware, for some additional entertainment. Have fun! 🙂

Cheers your Paparazzi team.

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