Humidity Temperature value displayed wrongly

RE: Humidity Temperature value displayed wrongly

pChu — Tue, 15 Dec 2020 02:07:09 GMT

Hi SUK would you be able to share your code I am struggling to get the environmental service up and running.

Many thanks!

RE: Humidity Temperature value displayed wrongly

SUK — Mon, 27 Feb 2017 16:56:58 GMT

Thank you Aleksander. I was able to read the RH and temperature values using nRFConnect.

RE: Humidity Temperature value displayed wrongly

Aleksander Nowakowski — Fri, 24 Feb 2017 12:09:45 GMT

To show humidity 44% the value expected is 4400 (dec) = 0x1130 so the characteristic should return 0x3011 (little endian)

RE: Humidity Temperature value displayed wrongly

Aleksander Nowakowski — Fri, 24 Feb 2017 12:05:14 GMT

Could you show what you get on the log? Remember, that according to www.bluetooth.com/.../viewer the resolution is 0.01 so in order to show humidity 1% you have to send 100 -> 0x6400. If you are sending 0xCBF4 than the value displayed by nRF Connect is correct. What value was intended?

RE: Humidity Temperature value displayed wrongly

Roger Clark — Thu, 23 Feb 2017 22:39:05 GMT

I looked at the ESS the other day, but decided it was too complicated for my use, so I just made a custom service instead which sends the data in a format which my app understands.

But, If you have to use an existing Phone App which supports the ESS profile, you will need to write all the code to support the ESS profile.

RE: Humidity Temperature value displayed wrongly

SUK — Thu, 23 Feb 2017 22:19:25 GMT

I checked with the BLE specs and did confirm that I am sending the correct value. I also noticed that Nordic does not support environmental sensing service. The ESS service requires many descriptors (like ES Measurement, ES Trigger Setting etc.) which are not present in the SDK. This service will not work with only the Client Characteristic Configuration Descriptor. The difference in values could be because of that. Roger, any ideas or comments on this?

RE: Humidity Temperature value displayed wrongly

Roger Clark — Thu, 23 Feb 2017 22:08:40 GMT

I suspect you code is not putting the correct values into the characteristic.

Either that, or there is a bug in Nordic's App.

Have you looked at the raw data and compared it with the Bluetooth spec to confirm you are sending the correct data

RE: Humidity Temperature value displayed wrongly

SUK — Thu, 23 Feb 2017 15:02:12 GMT

Yes, they are not listed in the SDK. I am using the "ble_app_hrs" example and adding the RH and temperature reading to that code. Let me know if you need a code spinet to take a look.

RE: Humidity Temperature value displayed wrongly

Roger Clark — Thu, 23 Feb 2017 00:28:25 GMT

Which code are you using for these services?

They don't seem to be listed in the SDK components\ble\ble_services