NSSL EFM Rotating PCB

The rotating electronics collect the majority of the scientific data during flight.
This includes the relative orientation of the sensor spheres, electrical charge flow
between the spheres, GPS position, temperature, pressure, and humidity. All data are
logged to an onboard microSD card for post-flight analysis. These measurements are
essential for understanding the electric field structure and environmental conditions
surrounding the instrument throughout its ascent and descent.

See the main instrument repo for documentation and the rest of the instrument.