In my country a lot of people user their bicycles for transportation. But I have never seen a bike with automatic brake lights. So what I want to do is display a random message like "Braking!" with large friendly letter when the accelerometer detects a deceleration of the bicycle.

Created a prototype and it seems to work just fine. Now I am waiting for the red lcd display to arrive from china (ETA 3 weeks)

Next step will be to mount the parts on a piece of wood in order to test it on my bicycle.

I am a bit worried about the power consumption but if it uses too much power the fallback plan is to use LED's instead of an LCD display.