Topics created by austin.c

Hi @austin-c
Sorry I missed this message somehow.
I will email you to kick this off with your team.

@austin-c , The GPS driver is built for SLPI as well as APPS PROC, so you could connect it to a apps-proc UART and start the driver on the apps proc side of PX4.

This was done on RB5 : https://docs.modalai.com/Qualcomm-Flight-RB5-linux-user-guide/

https://docs.modalai.com/voxl2-linux-user-guide/

Regarding magnetometer, just like with the GPS driver, you should be able to enable the mag driver to build for apps proc. Since the apps proc i2c uses standard posix interface, it should just work. However, i don't think we have ever tried it.

Alex

Hi @austin-c ,

You can find the latest M0138 firmware with regen completely disabled here

Also, I added the esc config that i've been using for testing here

For step tests, i have been using pretty aggressive step command:

./voxl-esc-spin-step.py --id 2 --rpm 2000 --step-amplitude 4000 --step-frequency 2.0 --timeout 2.0 --cmd-rate 2000 --enable-plot 1

In order to make the ESC not de-sync (due to long demag time of the motor), the following params were adjusted:

max_rpm_delta set to 4000 (you can go lower), to cap the maximum rpm transitions. Although in my test, the step is 4000, so this had no effect timing_advance: 45 -- this is pretty high commutation advance to trigger commutation earlier so that there is more time for back-emf sensing -- high advance wiil reduce motor efficiency and will cause the motor to heat up a bit more sense_advance: 30 -- delay back-emf sensing so that we don't sample back-emf during the motor coil demagnetization more details : https://gitlab.com/voxl-public/voxl-sdk/utilities/voxl-esc/-/blob/dev/voxl-esc-tools/doc/low_kv_motor_tuning.md

I had another thought.. What if you use a small battery to absorb the voltage spikes? Basically hook up a 6-7S battery with a beefy Schottyky diode (10A) set up with Cathode (negative) pointing to the battery.

you will have to make sure the power supply voltage never exceeds battery voltage + diode drop. you will also need to make sure that you don't over-charge the battery with repeated spike absorption.. It is possible to have some sort of self-discharge circuit to slowly discharge the battery to a certain voltage (using a Zener diode + resistor or something similar).

Anyway, just an idea..

Try out the no-regen firmware..

Alex

Hi @austin-c
yeah, and it will not.
There are dozens of changes between the two boards.
It's just easier and cheaper to order the correct version. We have no documents showing how to convert it is simply not doable for the cost and risk and time.

Not the news you wanted, but please trust me on that one. 🙂