Vario

For the software, I aim for the most robust, low-noise evaluation of the sensor data possible. At the core is a Kalman filter that fuses all 10 sensor readings and calculates a precise vario tone. On top of that, there is an efficient interrupt-controlled sampling routine and a modular code structure so that future extensions such as GPS logging, FLARM, or a display can be integrated without any problems.

For easy configuration, all settings can be adjusted using the LiftAir app.

• Firmware updates
• Customize the sound profile
• Change the Bluetooth protocol
• Calibration
• and much more.

At the heart of the hardware are a highly precise barometric pressure sensor, accelerometer, tilt sensor, and magnetic sensor.

A low-power microcontroller handles the sensor fusion calculations.

In addition, there is a Bluetooth module, GPS receiver, solar, and a battery for long runtime.

The speaker is a piezo buzzer: small, compact, and loud. Intuitive control with just one button.

If the battery still runs out, it can be fully recharged via USB-C in just 30 minutes.

The housing is incredibly important for good sound.

To keep costs low and remain as flexible as possible, I decided to manufacture the housings with a 3D printer.

ASA-CF should withstand all outdoor conditions.

Later, I would like to switch to injection molding or even machine them from ALU.