Tasker and hardware modding: now this is a guy after my own heart. Brad Nelson has created a project that uses both of these two “hobbies” to create a scooter that can be started using a shake gesture on a Droid 4. The gesture is registered by Tasker, which then runs a Python script that connects to the scooter via Bluetooth and starts the ignition. Another gesture is also available that controls a solenoid that locks/unlocks the seat storage department, where his helmet is located. Seeing as this uses a rather custom bit of software to handle the communication, I also doubt very much that it poses a bigger security threat than the ignition system that’s already in the scooter.
The project uses about $100 worth of parts, which isn’t a bad deal for something like this. On top of that it requires a bit of knowledge with Tasker, electronics, and scripting – though detailed instructions are available on his website. I’ve been considering a similar Tasker/Bluetooth/solenoid setup myself in order to control a light switch on my wall from my Tasker sleep mode, and I just love seeing someone who has actually gone ahead and done it.