SteelBytes wrote:
curious: is that some custom thing? any more info?
Yes.
The mp3 seat can be opened without a key or any else if the steer is not in lock position (is a button that activated a solenoid) so if a person stops for in example a fast errand and don't lock the direction (in the mp3 case, some times in narrow place move the wheels and lock is not practical at all) anyone can open the seat and stole anything.
Then I find a small circuit that play with the BT proximity (and is BT LE so is really low current from the battery, as an extra I add a 6 hours timer) and if is in range activated a relay that in my case allow the button to open the seat, if out of range the button can be pressed and nothing happens.