Lisa/S

Lisa/S

Lisa/S is a very small general purpose autopilot. The main goal of creating an autopilot of minimal size and weight, while providing a lot of functionality is achieved:

• Size: 20mm x 20mm x 5mm (0.787" x 0.787" x 0.197")
• Weight: 2.8g (0.1oz)

Features

• 72MHz 32bit ARM Cortex M3 MCU with 16KB RAM and 512KB Flash
• Combined 3 Axis Gyroscope and 3 Axis Accelerometer
• 3 Axis Magnetometer
• Barometer (Altimeter)
• Onboard U-Blox GPS
• Pads to simply connect a Superbit CYRF RC and telemetry module
• Switching buck/boost converter allowing wide range of power input making it perfect and stable for operation from a 1S LiPO cell.
• 2 MOSFET switches connected to PWM output channels
• 6 PWM (servo) outputs
• 1 debug UART port
• 1 CAN interface
• 1 Bind/Boot tact switch
• SWD programming/debugging interface
• Size: 20mm x 20mm x 5mm (0.787" x 0.787" x 0.197")
• Weight: 2.8g (0.1oz)

Pictures

So if you are ready to make your tiny plane fly autonomously,you can already order one here

Pinout

TODO

Block Diagrams

TODO

Barometer

In order to use the barometer, you just need to add one line to your firmware block (in your airframe file) :

File: conf/airframes/myplane.xml

<firmware name="fixedwing"> <target name="ap" board="lisa_s_0.1"> ... </target> ... <define name="USE_BAROMETER" value="TRUE"/> ... </firmware>

Once that line is added to the airframe file, you should be able to get the values of the barometer and paparazzi is going to take them into account when doing it's calculations.

IMU

The IMU used on the lisa s is a regular aspirin 2. But depending on how you put the lisa s on your UAV you migth get the axes mixed. You can for exemple put the lisa S side way :

For that you just need to add an option in your airframe :

File: conf/airframes/myplane.xml

<firmware name="fixedwing"> <target name="ap" board="lisa_s_0.1"> ... </target> ... <define name="LISA_S_SIDEWAY"/> ... </firmware>

Schematics

Availability

As of 2013-11-27 Lisa/S is available for pre-order from 1 BIT SQUARED.