I am currently thinking about a remote (30/40 meters) mailbox alarm
It might use only what I have in stock so I m thinking in that solution
I know the emetter side one can be stolen but there are nearly no-risk here, in a private park.
Before I go forward on that idea I want to know
- the concept is OK for that
- the arduino model to use (I have unov3 & nano available currently)
- is current consumtion a problem with this concept (boards limitations ?)
- is this dispance OK for 433Mhz modules (after replacing the antenna maybe)
I also started to write code for each but I won't go further for now, until I know it is ok to do so.
why using a ultrasonnic sensor ? because I have few of them & because it will be on door panel so if letter is dropped from hatch it will detect it ; and if the local box is opened for a little package it will detect that as well as the main door opennning for larger ones too.
then I can make from distance inside the box on receiver side determinate what kind of mail it is (letter vs package vs maindoor has been opened).
Any suggestion ?
Anything I have not thought about ?
Is it ok ?
Is there any limitations on current I missed ?