RSSI measurements only

[kcarrigan]

Hello,

I've got this Thiny:91 demo working nicely, but what I'd like to do now is only measure RSSI.

Is there firmware to only do this?

Like send AT commands only to Thingy:91 for RSSI, Lat/Long, maybe RSRQ if possible, and other AT commands.

Like to make a raspberry PI, or some microcontroller to serial poll the Thingy:91, once a second while walking around with it, using it to site receiver power by Lat/long. Don't really need any sensors but GPS.

Maybe I can also use an external cell antenna? Need a small calibrated antenna 2-3 dB with ufl connector.

Thanks,

Ken Carrigan

I

[JONATHAN LL]

Hi,

I am not sure what you want to achieve but we do have the asset tracker V2 example that can be used for GPS tracing\tracking an cloud services. 

If you dont want to use a Cloud solution then maybe the gps example combined with AT commands, like CESQ.  You can also use Bluetooth to connect to a device for data logging or use a usb cable.

The "normal" gett RSSI value does not work and will give you not detectable(CSQ).

You can connect a external antenna to the ufl connecter yes. https://infocenter.nordicsemi.com/topic/ug_thingy91/UG/thingy91/hw_description/hw_figures.html?cp=13_0_6_1 


Regards,
Jonathan

[kcarrigan]

Thanks Jonathan,

CESQ sounds exactly what I need. So what about thingy91_at_client_2020-10-30_5522ca2b?  Does this HEX only allow AT commands to be passed?  I can't make it work.  Loaded the Modem, and then this AT_Client.hex, but no response from the thingy:91.  Don't need cloud for this project, just iBasis connect to LTE-M or NB-IoT(which seems to not be around in Virginia, USA.

GPS is not critical as I can use an External GPS unit, this example above seems I have to download, build and program the unit (firmware not modem).  As I'm not too familiar with Zephar  and programming environment, might just use alternate GPS unit. How precise is Thingy:91 vs say NEO-M8P GPS? RSRP is really what I'm after, as LTE-M is only 1 PRB.

[JONATHAN LL]

Yes there is some building and programming involved, but i guess that the at_client example should do the trick if you are looking for RSRP values with CESQ command.
Have you tested the at_client with nrf Connect app and used the LTE Link Monitor? 

Regards,
Jonathan