[GreenKeys] Low paper indicator/ shut off model 28

[Nick England]

Arm with a switch is what I came across on one M28. I think it was a
standard TTY part.

Want sophistication? How about an ultrasonic or laser rangefinder like used
in manufacturing and printing plants.

Nick England K4NYW
www.navy-radio.com


On Sun, Mar 23, 2025 at 00:43 Harold Hallikainen via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Perhaps there could be an arm resting on the paper roll that is connected
> to the shaft of a pot. As the paper is depleted, the pot rotates. You can
> then use analog comparators to determine various paper levels. If you run
> the pot into an ADC on a microcontroller, you could do some math to
> determine how many meters of paper are left on the spool.
>
> Good luck!
>
> Harold
> https://w6iwi.org
>
>
> On Sat, March 22, 2025 2:33 pm, abowman89 via GreenKeys wrote:
> > Yes, Stan V is 100% correct.  Id like a two level trigger,  but that
> > being said I'm fine with a single switch and a relay,  it's more of
> > preference of mine since I'm down there enough id more then likely see a
> > light.  I work rotating 12s in maintenance so my schedule is all over,
> so
> > im not inclined to test fate either lol.         I did snoop around
> > and find a page with the breakdown for the switch kit but I think I'm
> just
> > going to make a bracket with some kind of follower and a swich.Sent via
> > the Samsung Galaxy S24+, an AT&T 5G smartphone
>
> --
> Not sent from an iPhone.
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