Bitcraze Forums

Hi guys,
I managed to work Crazyflie and the lighthouse base station, creating autonomous flights with a great stability.

Our Crazyflies have also a led-ring deck, using the drones memory I was able to create a led sequence but I was unable to write this mem to the drone (Via mem[0].write_data(self._upload_done)).

Maybe it's my mistake, but I'm having difficulty to find documentation about working with memory api. I would like your help in understanding how can I write a led sequence to the drone and, when starting with trajectory, how can I send start the led sequence?

Thanks.

This is quite new functionality so there is probably not a lot known about the memory from the python library point of view, but there is some documentation available for CRTP: https://www.bitcraze.io/documentation/r ... /crtp_mem/

We have examples for the LED sequence mem api: https://github.com/bitcraze/crazyflie-l ... memSync.py

Is this something you already found before? Let us know if you need more guidance

Yes I found it before and thanks for share it.

Nevertheless, I have some doubts regarding this:
- when using the example scripts, the mem sequence ends with mem[0].write_data(None), I supposed anything was written to the memory
- in other hand, when uploading the trajectories to CF and following the examples, trajectory_mem.write_data(self._upload_done) is written like that

My doubts were about this, I tried to write the led sequence as trajectory but it didn't worked.

The in just means that no callback is registered to tell you that the write was actually successful. In the trajectory example we did add a callback (_upload_done()) if you want to check out how to do that.