This is not a question about Arduino, but closely related to Arduino-driven project.
I am planning to make automatically unlocked mini chest. It will have some kind of electrical lock which will be opened by Arduino signal. The question is - where to find simple and not expensive electrical driven lock mechanism with size not more then 10 x 10 mm?
What are HW bazaars you may suggest?
build one with a servo?
robtillaart:
build one with a servo?
If it will stay locked when Arduino is powerless (spring?), it may be a solution. Did you encountered a servo which is little enough?
How big is the chest?
10 x 10 mm is small for a servo. - Pololu - RC Servos
How about wiring a small electromagnet yourself with a small nail and a spring?
robtillaart:
10 x 10 mm is small for a servo
My feeling that servo is overkill here. I do not need things to spin - I need it only tiny metal part to be pushed and pulled without additional mechanic, if it possible.
Reliable self-produced electromagnet with spring requires, at least, plastic frame for it.
Chest let say, as big as this one or a bit bigger.