Library conflicts nRF52840 Sense

Products & Technology XIAO
#21

Hello PJ,

tried both BSPs. Compiler always says "class TimerOne " has no member named ‘initialize’

Rads
Wolfgang

#22

Hi there,
Yes that’s not uncommon for older setups, and that’s for an AVR.
Try this one and you’ll see the Seeed board is called out and supported , BSP 1.0.X

HTH
GL :slight_smile: PJ

PS> DO NOT USE Timer (0) ZERO… or :bomb: :face_with_peeking_eye:

#23

Hello PJ,

Coming nearer.
Modifying TimerInterruptLEDDemo, I could use one timer for a short blink, following by a second timer for a longer pause.
But this sketch is only in milliseconds, and I need the first timer in microseconds…
Suggestion?

Thanks for your patience,

Wolfgang

#24

Hello PJ,

Is there a way to reset the Bluetooth system? It is only used at the beginning of the sketch, to start the main program.

Regards,

Wolfgang

#25

Hi there,
Great to hear that, There is a learning curve but it’s not Too heavy a lift though.
Here are some ways to stop BLE on an nRF52840:

  • Start and stop advertising: Use sd_ble_gap_adv_start() and sd_ble_gap_adv_stop()
  • Disconnect from the central: Use sd_ble_gap_disconnect() while in a connection
  • Stop scanning with BLE.end(): While the peripheral is off, stop scanning with BLE.end()
  • Disable completely the 2.4Ghz radio: After the 52840 has full soft device enabled and ble stack has been run, disable completely the 2.4Ghz radio

HTH
GL :slight_smile: PJ

#26

Hello PJ,

the sd commands were not accepted, but “BLE.end” worked!!! Golden Tip!!
Many thanks,

Wolfgang

#27

Result:


Bye,
Wolfgang

#28

Hi there,
SWEET!
Incrementally moving forward… NICE!
GL :slight_smile: PJ

#29

good to learn from it. dear.

#30

Hello PJ,

my application allows only 6 milliseconds to measure x and y accelerations.
Using myIMU.readFloatAccelX(), each measurement takes between 651 and 670 microseconds. This allows for 8 measurements, which works, but I would like somewhat more samples. Is there a method to measure x and y at the same time?

Regards,

Wolfgang

#31

Hi there,
Have a look at the data sheet that seems kind of low, If you use High performance mode, Higher clock, probably do better.
HTH
GL :slight_smile: PJ

#32

Hello PJ,

tried all the Arduino IMU examples, always >650 µs.
No idea how to modify IMU readings, or what is behind “!2C_MODE”.

Regards,

Wolfgang

#33

Hi there,
What about I2C clock speed or buss speed? any adjustments there?
With out seeing the code , Hard to see where you can gain. What the use case your attempting to satisfy.
HTH
GL :slight_smile: PJ

#34

Hello PJ,

To use the acceleration sensors, I just copied the example HighLevelExample, as provided by Arduino.
It does not seem to allow any speed modifications.

Regards,

Wolfgang

#35

Hi there,
Ok , I see. Well I know there’s a limit to the speed of getting the readings, even in the high level examples but seems kinda low. (pretty sure the config reg’s are NOT set to high performance)
imo. I would think using the fifo for example could improve that and also writing the values to memory with a DMA function. lots to see here too, I thought there was an interrupt driven one that yielded better speed.
Can you describe what it is you want to do more concisely as an overview.
is this a realtime app or a data logging situation?
Definitely use the search here for IMU readings etc. to find more solutions.
HTH
GL :slight_smile: PJ

#36

Hello PJ,

My timer is mounted in my controline model aerobatic airplane. It provides pulses between 1 and 2 ms, each 8ms. The pulse length determines the speed of the motor which powers the plane. The idea is to keep the x acceleration constant during maneuvers, So, I need to measure the accelerations as accurately as possible, to avoid overshooting. Therefore I measure as often as possible, calculating averages, used to calculate the duration of the next pulse, Now I measure 4 times x and y, but I would like to improve the system by also measuring z…
In the past, I had a simple timer with a Microchip, programmed in Assembler, where an A/D conversion was very quick. But there external sensors made it clumsy, so I switched to the Seeed.

Hopefully I described my system well enough.

Regards,

Wolfgang

PS, Pictures and movies can be supplied :slight_smile:

#37

Hi there,
Very well described, i have seen several rocket launch telemetry data sketches similar.
Ill ponder it for a spell and get back asap. :v:
GL :smiley: PJ