Graupner HoTT Sensors

Fixed Wing ESC Sensor Driver

It is now possible to connect the Graupner Brushless Control T range of ESCs directly to the PX4 so that the autopilot can read the following live data directly from the ESC:

  • temperature
  • voltage
  • current
  • RPM

Currently this data is being read by the driver and written to an internal message but it is possible to log the data using sdlog2. If you are a Graupner HoTT user you can read the data directly on your radio if you use the hott_telemetry app (don't forget to activate General Air.Mod on your transmitter).

You do not have to have any other Graupner HoTT equipment to use this ESC. The PX4 is simulating a HoTT receiver.

What you will need


The wiring is very straight forward. You simply need to connect the single wire coming out of the ESC to the TX pin of a UART (serial) port on the PX4.

If you use the PX4FMU with the PX4IO you can connect it to the TX pin on a free UART port such as USART2 (/dev/ttyS1) on the PX4IO using a Hirose DF13 5 pos (Digi-Key Link: DF13-5P-1.25DSA) connector. More information on the location of the port can be found in the PX4IO User Manual.

Manually Starting the Driver

To start the app manually from the NSH console type:

nsh> hott_sensors start

To check whether the app is running:

nsh> hott_sensors status

To stop, use:

nsh> hott_sensors stop


–device / -d

The default UART is currently set to /dev/ttyS1 (USART2).


Starting the driver using an alternative UART, such as UART5.

nsh> hott_sensors start -d /dev/ttyS2

Auto Starting the Driver

Add the following line to /etc/extras.txt on your microSD card:

hott_sensors start
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