(Not sure if this is the right category to use, feel free to move)
I’ve just ordered myself a Hologram Dash to build a basic postbox monitor - that is, something which can sit in my physical mailbox downstairs and notify me when someone puts something inside it. The idea, silly as it might be, is to avoid having to go downstairs 3 or 4 times each morning to check for post.
Alas, the postbox is outside the range of my WiFi, otherwise I’d have probably gone for the Adafruit Feather Huzzah, but I welcome this opportunity to play with GSM bits and pieces.
Anyway, right now that’s less of a concern - what’s more important right now is figuring out what sort of switch or trigger I can use to recognise that something has been posted.
One approach I considered is to use a PIR sensor, which I’m hoping would recognise movement, but I’m worried this might get damaged if anything large is posted, and feel there must be a better approach, which is why I’m posting here.
I’ve attached some photos of the postbox - I figure there might be some type of switch which I can attach to the flap, but I’m not very well versed in such things, so would welcome some suggestions.