Live configuration of the nRF52832 Soc. using Bluetooth protocol and on & off modes

RE: Live configuration of the nRF52832 Soc. using Bluetooth protocol and on & off modes

Turbo J — Sat, 01 Aug 2020 12:21:54 GMT

[quote userid="91869" url="~/f/nordic-q-a/63673/live-configuration-of-the-nrf52832-soc-using-bluetooth-protocol-and-on-off-modes"]my decision was to use Keil, but I don't know how to start, because most of he example codes are for development kits. [/quote]

I strongly recommend using a DK to build the labratory prototype / test model with the development board from the analog frontend (will be a "mess of wires" prototype). This allows you to build upon existing examples and get to know how "stuff works" by looking at the code and how it performs in the real world. Otherwise the nRF SDK can be a bit overwhelming.

Using softdevice and bluetooth allows low-power wireless connections - while the radio cannot work in sleep modes, it can be turned on and off very quickly. Low bandwith applications thus use the radio only for a very minor fraction of time.

Transmitting EEG signals over bluetooth will exaust the available bandwith rather quickly. A few data channels might be possible, but will use significant bandwith (and energy).

RE: Live configuration of the nRF52832 Soc. using Bluetooth protocol and on & off modes

Masoumeh — Sat, 01 Aug 2020 10:42:58 GMT

Can we put the nRF52832 in sleep mode and configure it to wake up in 48 hours ? or for every hour the BLE become active for 5 minutes? I mean when the nRF52832 is in the sleep mode, do other parts, except the radio transceiver, works? I mean timers and counters.

I want to do this because I have to wait at least 48 hours for the recovery of the animal from the surgery that we set the electrodes in their position and the recording system on its body.

RE: Live configuration of the nRF52832 Soc. using Bluetooth protocol and on & off modes

Kenneth — Wed, 15 Jul 2020 10:16:12 GMT

You need to duty cycle them (TDMA scheme).

Best regards,
Kenneth

RE: Live configuration of the nRF52832 Soc. using Bluetooth protocol and on & off modes

Masoumeh — Tue, 14 Jul 2020 19:36:55 GMT

thanks a lot. I have another question, can we receive the data from 2 individual nRF52832 simultaneously with 1 receiver? for example we have two system that are recording neural signals and both of them are sending the data to the computer, can we receive the data by 1 receiver or we need 2 of them?

RE: Live configuration of the nRF52832 Soc. using Bluetooth protocol and on & off modes

Kenneth — Tue, 14 Jul 2020 12:57:06 GMT

You can send any data you like, and you can choose how to interpret and take action on the data as you like.

Best regards,
Kenneth

RE: Live configuration of the nRF52832 Soc. using Bluetooth protocol and on & off modes

Masoumeh — Tue, 14 Jul 2020 08:07:04 GMT

Hi, thanks a lot for your response.

I have another question, while we are connecting with the nRF52832 by radio, can we send any command ? I mean can we change the configuration during wireless connection?

RE: Live configuration of the nRF52832 Soc. using Bluetooth protocol and on & off modes

Kenneth — Mon, 13 Jul 2020 09:40:19 GMT

Hi,

While in sleep the radio cannot be active, since it will draw several mA of current (instead of uA in sleep). If you need to wakeup the system, then the typical solution is to duty cycle the radio (e.g. wake it up every few seconds for some ms). Then any transmitter must transmit frequent enough to hit this wakeup window if it has some specific data that should trigger an action.

Typically I recommend to use BLE for all applications these days, simply because it provided high security combined with a fully tested way of establish connection, transferring data reliably and ensure interoperability with peer devices. You should find many examples in the nRF5 SDK that can be used for basis:

https://infocenter.nordicsemi.com/topic/struct_sdk/struct/sdk_nrf5_latest.html

Best regards,
Kenneth