[GreenKeys] Low paper indicator/ shut off model 28

[John, W9DDD]

My father did something like that to determine how far open the windows 
were on a green house.  That was an energy conservation project 30 years 
ago.


On 3/22/2025 6:43 PM, Harold Hallikainen via GreenKeys 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

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The above comments or recommendations are SWAG. Use at your own risk.

John, W9DDD