Hello
I'm building a project that will utilize a 555 timer. I purchased one, and a bread board, and I have been experimenting with all different circuits. Instead of confusing everyone with how the entire project will work (believe me, its confusing) I'll just explain how i need the 555 timer to work. And I'll add that I have successfully built all of the circuit examples I can find online, all of which work, but none of which work for my application.
-It needs to not trigger when powered up.
-When power (or ground, whichever it takes to make it work) is applied to pin 2, I need it to still do nothing.
-When power(or ground) is removed from pin 2, then I want the timer to begin (which will add power to pin 3). When the timer runs out, i need it to remove power from pin 3 (without re-triggering itself!). And that's it. Also, I do know how to control the length of time the timer runs for.
I hope this makes sense to someone. I've seen and re-created so many different 555 circuits, and I either can't get it to not re-trigger itself, or it triggers on power up, or the trigger has to be a pulse, which doesnt help.
Any help is appreciated!