I need a timer...
Asked by
XOIIO (
18328
)
March 26th, 2010
I need a simple timer so that when a switch is pressed for a fraction of a second, it will give power or activate a relay to send power to a buzzer for one second. An arduino is not an option.
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4 Answers
Are you talking about Jeopardy style switch?
Are you handy? You can make one with an LM555 timer chip. Get it at Radio Shack.
These chips cost about $1.00. Much less in quantity.
Use a discrete sensor light switch and connect it a buzzer to it instead of a light. They have variable delays from none to several minutes. You would just need to wave your hand in front of it.
@worriedguy Yes I am, I just needed to find the instructions to make a timer, thank you.
@DarkScribe That would not work.
This is for a nerf gun target project, which I will be posting on instructables soon _crosses fingers—.
I am going to have a block of wood with a tripod mount (already done) and the curcuit. There will be a pie plate bottom glued to a lever switch, and hooked up to the timer and buzzer. When you hit the target, the buzzer will sound, letting you know you hit it.
I came up with the idea to replacemy old target method, leaning pie plates up on the couch, and them falling when I hit them.
This project will make it much better, because I can adjust the height and place the target anywhere I want, instead of a few locations with not enough distance to snipe with my longshot.
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