[sdiy] Retaining button state after power off?

[Ove Ridé]

Yes, a micro with built-in EEPROM could work as an easy black-box
device doing this for you. But do you really and truly need to use
this toggle mechanism? You could for example use two toggle switches
to form a total of 4 states. Or if you want to be ridiculous, you
could maybe attempt something like core memory to hold your two
bits... ;)

On 31 January 2014 17:51, Justin Owen <juzowen at gmail.com> wrote:
> Hello,
>
> I have a couple of simple analog circuits that allow you to cycle through 2, 3 or 4 options/outputs/etc using a momentary push switch.
>
> So, for a 2-cycle switch, click 1 is 1, click 2 is 2, click 3 returns back to 1 and so on. For a 4-cycle it's 1,2,3,4,1,2,3,etc.
>
> The circuits output either a high or low state
>
> The problem is that these circuits return to their default state on power off.
>
> What would be the simplest way to write the button state to some sort of non-volatile storage that could be reinstated at start-up?
>
> I'm guessing a micro is going to be the most likely answer - but if there is a non-programming option available it would be great to hear. Failing that - absolute simplest solutions where possible please!
>
> Thanks,
>
> - J
>
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-- 
/Ove

Blog: <http://blog.gg8.se/>

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