The GY-91 consists of the barometric pressure sensor BMP-280 and the multiple-sensor package MPU-9255.

We use the GY-91 with an I^{2}C-communications interface.

The MPU-9255 is a System in Package (SiP) that combines two chips:

  • MPU-6500, which contains
    • a 3-axis gyroscope,
    • a 3-axis accelerometer,
    • and an onboard Digital Motion Processor™ (DMP™) capable of processing complex algorithms.
  • AK8963, a 3-axis digital compass (magnetometer).

With the GY-91, the CanSat is able to measure

  • air pressure with a sensitivity of ±0,12 hPa (equivalent to ± 1m) and a pressure range of 300 – 1100 hPa (equivalent to heights from +9000 m above sea level to 500 m below sea level).
The GY-91 soldered to the vs. 6.2 CanSat shield.
  • acceleration i 3 directions, where the full scale range of the digital output can be adjusted to ±2g, ±4g, ±8g, or ±16g.
  • rotational speed around 3 axis, where the full-scale range of the gyro sensors can be digitally programmed to ±250, ±500, ±1000, or ±2000 degrees per second (dps).
  • magnetic field strenght in 3 directions with a full scale range of ±4800 μT.
  • Data sheet for the MPU-9255 sensor package can be found here.

    Data sheet for the BMP-280 pressure sensor can be found here.