Accelerometer, I think it might be not efficient, and you would need some data processing to get the data to really represent something.
Probably a magnetic switch would do a better job here !
Thanks, good point.
For those curious, its a Czech mailbox.
The thing is, its not "my" mailbox, its property of the post. So I don't want to drill stuff etc. There are basically 4 mailboxes next to each other (see pic). And when they insert the post the whole front opens downwards (over the horizontal axes). Well thats what they told me, since there are no numbers on it. Only the mail(wo)men can see which one is which (house)number (once opened).
I would expect that I can simple trigger on that motion (magnetically (eeks)). Problem is that although it can easily render
some false postives (i.e. mailbox opened but mail is not for me). Nevertheless, much better then going up and down daily for nothing. Not even sure if the range, and the fact its inside a metalbox would give me a good
range signal.
Thinking of it, a bit of exercise wouldn't hurt
Maybe I should "bride" the post, ask them if they can bring it in exchange for some coffee, most of its now-a-days is digital.