Direction finding - Hardware selection

RE: Direction finding - Hardware selection

Venkat RAM — Mon, 03 Jul 2023 17:20:34 GMT

thank you so much kenneth

RE: Direction finding - Hardware selection

Kenneth — Mon, 03 Jul 2023 11:08:13 GMT

Please refer to the documentation for what hardware is supported:
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direction_finding_connectionless_tx/README.html
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direction_finding_connectionless_rx/README.html

The nRF52833 is a good fit for direction finding.

Kenneth

RE: Direction finding - Hardware selection

Venkat RAM — Sun, 02 Jul 2023 03:52:11 GMT

Hai haakonsh,

here in nrf5340, ram, CPU, and flash memory were high,

but in nrf52833, is less which is shown above in the above comparison chet above

In the nrf community blog, they instructed, for Processing the IQ data needs more RAM

is nrf52833 spec okay for direction finding process, or can I go ahead with nrf5340

For my application, I need to find direction finding for multiple devices at the same time

suggest one model, kindly share the reason, i will usefull for my development purpose

RE: Direction finding - Hardware selection

haakonsh — Fri, 30 Jun 2023 20:59:05 GMT

Hey Venkat,

[quote user="Venkat RAM"]but I am confused about the CPU, RAM are highly graded in. nRF5340 at progressing[/quote]

I don't understand what you are asking for, can you rephrease your question?

BR,
HH.

RE: Direction finding - Hardware selection

Venkat RAM — Fri, 30 Jun 2023 08:07:29 GMT

Thanks haakonsh,

"To successfully use the direction-finding locator when the AoA mode is enabled, provide the following data related to antenna matrix design:

The GPIO pins to dfegpio#-gpios properties in the nrf52833dk_nrf52833.overlay file.
The default antenna that will be used to receive a PDU dfe-pdu-antenna property in the nrf52833dk_nrf52833.overlay file.
Update the antenna switching patterns of the ant_patterns array in the main.c file."

Direction finding - Hardware selection

based on the above ref nRF52833 DK suits for AOA Concept development

but I am confused about the CPU, RAM are highly graded in. nRF5340 at progressing

Kindly clear my query

RE: Direction finding - Hardware selection

haakonsh — Tue, 27 Jun 2023 12:56:11 GMT

Yes, that is correct. The nRF52840 does not support Continuous Tone Extension.

CTE is a constant carrier (pure sine wave) used as the reference signal for gathering IQ datapoints. See https://en.wikipedia.org/wiki/In-phase_and_quadrature_components.

RE: Direction finding - Hardware selection

Venkat RAM — Tue, 27 Jun 2023 12:20:06 GMT

"nRF52840 does not support Direction Finding."

means it does not support even for Transmitter of AOA right?

For both RX and TX need to choose only from the below soc right?

nRF5340 SoC
nRF52833 SoC
nRF52820 SoC
nRF52811 SoC

RE: Direction finding - Hardware selection

haakonsh — Tue, 27 Jun 2023 11:33:05 GMT

nRF52840 does not support Direction Finding.

Read the Direction finding connectionless locator sample documentation, and pay attention to Rquirements and Antenna Patterns.

Reference reading:

BLUETOOTH CORE SPECIFICATION Version 5.4 | Vol 1, Part A, Chapter 8 DIRECTION FINDING USING BLUETOOTH LOW ENERGY
BLUETOOTH CORE SPECIFICATION Version 5.4 | Vol 6, Part A, Chapter 5 ANTENNA SWITCHING
BLUETOOTH CORE SPECIFICATION Version 5.4 | Vol 6, Part B, Chapter 2.5 CONSTANT TONE EXTENSION AND IQ SAMPLING

Note that sampling IQ data and processing it correctly it is not trivial, and there is little available support resources for small projects.