Detect non-responsive radio about hr20-esp12-master

[volca02]

according to this article: https://hallard.me/how-to-detect-rfm12b-or-nrf24l01-device-presence-in-your-code/

We can use low battery voltage detection to check for rfm presence.

RFM12 datasheet has the ability to detect low voltage, we will be using this function to detect the device. For this example I’m using LowPowerLab rfm12b library written by Felix and tweaked from excellent one written by jcw from jeelabs, but you can use another one the same way.

The Low voltage threshold can be setup from 3.75V to 2.25V. So until you’re powering the RFM12B device from let’s say 2.4V to 3.6V (which is juste the datasheet recomendation) you will be able to detect the device. The trick is done in two phases.

    Set threshold voltage to 3.75V, and check we’re under voltage.
    then set threshold voltage to 2.25V and check we’re above under voltage

That’s it, simple and efficient not ?

[volca02]

begin() should work like this: if the RFM12 was not detected, the code would end without initializing the radio, and every method use would end without using the radio. Error reporting should implement permanent error section.

[volca02]

Inspect the possibility to reset unresponsive radio (reset line?). Further detection of problems via full packet queue.