Designing button that closes switch only after being held down for some time

[polar8]

I am building a blinky light for my bicycle, and I would like it to turn off automatically when my bike is hung from the ceiling in my apartment. I am envisioning a tilt switch that closes in this position, and some supporting circuitry that requires the tilt switch to be closed for x amount of time before the light turns off.

I guess a simpler way of stating this problem would be to say I want to make a button that completes a circuit only after being held down for some time.

Any ideas? Thanks!

[nuhamind2]

Button to charge RC circuit, then comparator (can be opamp) to turn on switch.
perhaps can be made with single 555 since it has built in comparator

[vlf3]

Yes, I would go with that idea too... 7555 the C-MOS version has low power and ideal for battery supplies, have a look at the below application circuits or search the internet with 555, you will have tooo-much to go through. 

[ramicio]

I made a circuit for an amplifier that requires one push of a button to turn it on and holding it a few seconds to turn it off.  I used a PIC because I don't really understand passives and I have no idea how I would even make an RC circuit that doesn't oscillate.

[SeanB]

I did something similar to only activate a door release if held down for around 5 seconds. It used a SCR and a RC delay along with a zener diode. Works a treat for a couple of years now.