How I know I am home

[ard jonker]

On 4 Jun 2015, at 22:51, Mark Johannessen <mfjlaw at gmail.com> wrote:
> 
> I worked on one of the active systems in the past and it worked well
> except for the short battery life of the active tag, the fact that the
> supplier company is no longer, and the range was limited - I was
> looking for at least 20m.

I probably wrote this before: a jeenode pair: one in your car sending out blips every minute, one on the xtension computer. Range about 100 m in field, energy use next to nothing. In range: you are home, out of range: you are away. Nodes can send ID so multiple senders; one for you, one for the wife, one JeeLink on the xtension computer.

Can be done with zigbees too, I guess.
Ard