timing circuit to run N-times

[darrins]

I have a simple circuit that uses a 555 timer to turn on a stepper motor for a certain amount of time.

I'd like to connect the circuit to a rotary switch to make the circuit run 1, 2, 3....N times.

What's the simplest way to do this?

Thanks.

Darrin

[Guest Yevgenip]

I think you need some sort of counter for that, that will count to the binary number you input. While counting, the motor will work, when it reaches the end - the motor will stop. The counter should be triggered by the voltage drop from the 555 timer.

[darrins]

Thanks Yevgeni.

Know of any good IC's for this purpose?

If I can't figure out how to use the counter, I can always just use multiples of my timing resistor.

If my timing resistor is R, then I can use 2R to run twice, 3R to run it three times, etc.

I know this isn't the most elegant solution, but then again, I'm no electronics guru.

[Guest Yevgenip]

Sorry, I can't recommend any good chips, I'm more of a theorist and I am not too keen about logic cheeps, only the logic behind them.

Yes, if you don't want to mess around with microcontrols, your solution is preety good.

Good Luck! ;)

[Kevin Weddle]

It sounds you like you want a variable oneshot. The one shot will deliver a pulse for a duration with an input pulse. You pulse the input for a short duration and the one shot produces an extended pulse. I'll have to check how you vary the pulse of a one shot.