Higher precision in BLE_UUID_HEALTH_THERMOMETER_SERVICE

[bimcio]

Hi,

I am trying to include temperature (read from DS18B20) in advertisement data using BLE_UUID_HEALTH_THERMOMETER_SERVICE. So far it works fine, but my temperature is multiplied by 10 (234 instead of 23.4). I use following code (inspired by examples I found), on nrf51822:

  uint32_t temperature_data = measure_temp_ds18b20();

  service_data[1].service_uuid = BLE_UUID_HEALTH_THERMOMETER_SERVICE;
  service_data[1].data.size    = sizeof(temperature_data);
  service_data[1].data.p_data  = (uint8_t *) &temperature_data;

Temperature is shown correctly (e.g. in nRF Temp app on android) but of course as 234, instead of 23.4. Is it possible to send this value as fractional?

greetings, Bartek

[bimcio]

Hi Michael, thanks for answer. My measurement function returns temperature multiplied by ten, but of course I know how to get 23.4f from 234. But I don't how to put this float into service_data[1].data (or how to put '234' but inform "client" that information is of factor 10x). I'm really new to this stuff so I would appreciate working example. As nrfTemp shows temperature with one digit precision (23.0) so I guess there is a way to send out this information in a way it is interpreted correctly by BLE client. Bartek