I just wanted to know if anybodys done a remote car alarm system activation via sms before?(the idea is that the owner has forgotten to arm the system and can do so via sms) I have an ultrasonic sensor and also want to know if its output can turn on or off an LED?
Onstar has this function from what I remember… or are you asking if any of us have put together such a device?
As far as the ultrasonic sensor. I seem to remember back in the late 70s early 80s having a sanyo tv with a ultrasonic remote control using the same ultrasonic devices found on poloriod cameras… so I can say that it is very possible to use it in that matter.