[sdiy] Rotary Switch -> illuminated PB w/ multicolor LED?

[Roman Sowa]

Power off and one button + LEDS was discussed here exactly 8 years ago.
There's no endurance issue, because how many times do you plan to turn 
off the modular? Some people never do it at all. But let's say everyday 
for 40 years, so that's still about 15% of typical EEPROM endurance in 
microcontrollers, and probably less than 1% of standalone good quality 
EEPROMs.
EEPROM should be written only when supply voltage is detected to fall 
below some threshold. Those 8 years ago I've made an example with 
PIC12F683 and even posted video about it. Of course at the moment you 
can forget about getting any PIC12F683, but it can be rewritten to 
anything else with self-writing capability.

Surely nothing beats Grayhills, although for me they are too stiff for 
1/2'' knob. OTOH the already mentioned NKKs work with perfect feel.

Roman

W dniu 2022-02-11 o 18:52, grant musictechnologiesgroup.com pisze:
> I haven't found one small enough and even the closest competitors seem
> like $10+ (recent prices).  The Grayhill 56 series is pretty tiny as
> rotary switches go.
>
> The other thing that's nice about a rotary switch versus an electronic
> pushbutton/MCU/LEDs is memory. Not only does the switch already tell you
> what bank you are on as you switch it, but it remembers it when the
> power goes off.  :-)  So that needs to be factored into the MCU probably
> (EEPROM or emulation in flash, but endurance could be an issue).
>
>
> ------ Original Message ------
> From: "Mike Beauchamp" <list at mikebeauchamp.com>
> To: "synth-diy at synth-diy.org" <synth-diy at synth-diy.org>
> Sent: 2/10/2022 3:11:24 PM
> Subject: Re: [sdiy] Rotary Switch -> illuminated PB w/ multicolor LED?
>
>> On 2/10/22 11:02, grant musictechnologiesgroup.com wrote:
>>>   Speaking of supply chain fun, a really nice *small* SP4T rotary Grayhill
>>>   switch has gone from a pricey $10 to $16. So that's well beyond nuts for
>>>   most of us I'm sure. Alternatives?  This is for digital control, so I
>>>   can work with 2 bits or 1 of 4 some other way.  I'm thinking a
>>>   pushbutton with internal multicolor LED and a PIC or ATTINY (assuming
>>>   you can buy those?!).
>>>
>>>   I really like that the switch is both selector and indicator, so that
>>>   needs to be replicated.
>>
>> What about replacing it with another 4T rotary switch? There's a bunch
>> available.. the "open frame" ones are pretty common and so are plastic
>> enclosed ones branded Alpha and CK. I used to use some from digikey that
>> had a very long shaft (3-4") but was very easy to cut down.
>>
>> Mike
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