Hello Miko,
you can use any F1 or F3 flight controller with onboard 6DOF IMU (this includes a 3-axis accelerometer) and connect its telemetry output to any Jeti receiver. Currently there is work ongoing at the telemetry interface (betafllight already can use EXBUS, cleanflight only in the newest beta etc.), but I think this will be harmonized during the next weeks / months...
These FC start at around 10,- EUR (STM32 F1 controller, 6DOF) and just require a Jeti RSAT to connect to your transmitter. Just search for "NAZE 6DOF" on ebay or international selling sites...
With a 10DOF type you get the air pressure and temperature in addition, so you can build your weather station with the JETI system
I use the LTM telemetry output (+ a small converter LTM -> JETI), reporting the quadcopters ROLL and NICK angle in degrees [°], visible as Jeti sensor data and logged by the Jeti transmitter. The FC doesn't care if its fitted to a quadcopter or just used as a measuring device
Give it a try!
regards Henning