/diy/ - Do It Yourself

>>715577

>I'm assuming a 555 timer wouldn't be exactly accurate for such an application?

Define accuracy, the 555 can lose around half a minute or so, but it's a repeating cycle, so that time is more or less constant, if you want it for example for Halloween props it would work just fine.

If you want a precision down to a millisecond an ATTINY85 will do the job, it costs around $2 and you can easily program it, add buttons, LED indicators...

It also needs less voltage than the 555, you can easily power it with 3 AA batteries, and with a power saving function it can work for months.

The drawbacks is you need an arduino or an AVR programmer to program it, but the code is so simple I could write it for you in a minute.