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

[chris]

And, if IIRC, EEPROM is way more robust than flash, so it's usable for
frequent user settings, while flash is more suitable for firmware
updates (which ususally don't happen 10 times a day). 

I seem to remember a recommendation not to re-use a development flash
controller chip for a production device, since it probably has been
erased many times during software debugging.

Chris



On Fri, 11 Feb 2022 18:20:57 +0000 Mike Bryant
<mbryant at futurehorizons.com> wrote:

> Shouldn't be a problem with endurance as it's the erases that wear a cell out the most.
> 
> I program a byte at a time.  I start at the first byte with all ones = off, so 0x01111111 = on, 0x00111111 = off, etc.  Then when the byte gets to zero I move to the next byte and set that to 0x0111111.  And so on through the page.
>  Only once the whole page is full of zeros do I erase it.
> 
> 
> 
> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of grant musictechnologiesgroup.com
> Sent: 11 February 2022 17:53
> To: Mike Beauchamp; synth-diy at synth-diy.org
> Subject: Re: [sdiy] Rotary Switch -> illuminated PB w/ multicolor LED?
> 
> 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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Christian