Event driven Temp help

[HEng]

@ScruffR

If your device really loses power and you haven’t got a backup power connected (e.g. coin cell on VBAT for Photons) then the last values won’t be retained, unless you store them in EEPROM (or any other non-volatile medium).

I'm sure you know this, but lest anyone be confused, when you use battery backup you need to declare a variable as 'retained'. Variables are not automatically saved when you have VBAT.

Retained Memory Tips

Retained memory is a feature of the Particle Photon and Electron that allows data to be preserved across reboots. As a quick refresher: | Technique | Fast | Unlimited | Survives | Survives | | | Read/Write | Writes | Reset | No Power | | ------------ | ---------- | --------- | -------- | --------- | | Regular RAM | Yes | Yes | No | No | | EEPROM | No | No | Yes | Yes | | Retained RAM | Yes | Yes …