LM35DZ and NRF51822

RE: LM35DZ and NRF51822

Håkon Alseth — Thu, 26 Jun 2014 08:05:07 GMT

The health thermometer service is aimed for medical use, not generic temperature use. You can see this by looking into the specifics of the service: developer.bluetooth.org/.../CharacteristicViewer.aspx

Unfortunately, there is no generic temperature profile, so the best alternative is to use a proprietary profile (if this specific one does not suit your needs).

We have a application note on how to setup a proprietary service here: www.nordicsemi.com/.../9868241

Updated firmware for this nAN can be found on our github account.

RE: LM35DZ and NRF51822

Robert — Thu, 26 Jun 2014 07:20:03 GMT

I'm done. It work fine .Still needs some minor adjustments to the sensor circuit. I have question about services. Now I used for external sensor "BLE_UUID_HEALTH_THERMOMETER_SERVICE", It is possible create new service like "BLE_UUID_EXTERNAL_THERMOMETER_SERVICE"? If yes, what is the procedure? Needed new AssignedNumber? Thanks.

RE: LM35DZ and NRF51822

Robert — Tue, 24 Jun 2014 11:09:44 GMT

Hi a test sensor circuit. +Vs = external USB 5V, Vout = used filter R-C (75Ohm+1uF). The output is 232 mV, which corresponds 23 Celsius. 0mV=OC, 100mV=10C, 500mV=50C, 1000mV=100C. It is possible used circuit with 22kOhm resistor between +Vou and GND > -55 to 150Celsius (10mV/1Celsius)

RE: LM35DZ and NRF51822

Håkon Alseth — Tue, 24 Jun 2014 10:46:55 GMT

I would recommend running the external peripheral within the specifications given by the manufacturer to ensure that it's actually giving out sensible data before debugging the ADC output of the sensor.