I am looking to install a capacitive touch switch behind the quarter window glass in my car to open the doors since i shaved the door handles. The switch would be mounted behind the black painted glass so its not seen. I want the switch to have power when i disarm the alarm system and no power when the alarm is set. Any ideas on a cost effective way to achieve this?
@Stealthmode93 Welcome to the RobotShop Community. Had not really heard of “shaving door handles” so had to look it up. Does it present a safety risk if people need to access people trapped inside (for whatever reason)?
Regarding power and the alarm, that’s an interesting question and don’t have a good answer for you unfortunately. Hopefully others will chime in. You’d likely need to understand the alarm system’s electronics, though not sure how likely it is to be able to find a trace on the PCB which changes state based on “active” or “inactive” which you could connect to another MCU and the capacitive sensor as it’s likely all done within the alarm’s microcontroller. Another approach (which is likely easier) is to redo the alarm (i.e. a semi-custom alarm).
That aside, are you sure you’d prefer a capacity sensor which anyone could use, or something more specific like RFID or a thumbprint scanner? You might be able to use the two together - apply the RFID tag to both unlock the door and disable the alarm.