How to do Proximity Search with nRF51422

RE: How to do Proximity Search with nRF51422

Petter Myhre — Tue, 01 Nov 2016 12:32:29 GMT

I think you are correct, but you should only set this on the slave. The thresholds are RSSI values, and there is a relationship between RSSI and distance, but it depends on a lot of factors, so I can't give you a general formula, see this for more information.

RE: How to do Proximity Search with nRF51422

angel — Mon, 31 Oct 2016 17:00:49 GMT

Hi Petter, thanks for your fast answer!

I will first try the first solution you mentioned. I have read more or less all the documentation you mentioned, and so far I think that I only have to send this sd_ant_search_set() message right before opening the channel. I have a doubt though: so far I set it only on the master, but the device keeps pairing even at 2 or 3 meters distance when I set it to the minimum. Is there more or less any relationship between these PROXIMITY_THRESHOLD_X and the distances? This config message, does it have to be set in both master and slave? only slave? only master?

Thanks!

RE: How to do Proximity Search with nRF51422

Petter Myhre — Mon, 31 Oct 2016 11:33:04 GMT

I see two options:

-You can use sd_ant_prox_search_set() to do a proximity search, see Section 6.4 in ANT Message Protocol 5.1 and the Proximity Search application note, both available here.

-You can use a background scanning channel, and enable extended data format with Channel ID Output and RSSI Output.