The helmet lock is made of stainless steel transmission chain ... want to leave it on the bike where it could be scratched or stolen. “I used to have a top box on a previous bike, but it was too ...

It was made by Master Lock, and was the model with the stainless-steel case with a black dial ... Click on it, and another page comes up with a box labeled "Lost Combinations." ...

The box is big enough to hold a smart phone and has an Arduino-based time lock. The real trick is making the box so that the Arduino can lock and unlock it with a solenoid. [Digitaljunky] doesn ...