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Topic: 10K pot without stop (Read 2 times) previous topic - next topic

cowasaki

Anyone know if it is possible to buy a 10K pot that just keeps turning ie goes from 10K to zero as you keep turning it round and round?

Graynomad

I haven't seen them but it's possible. However it sounds like you really need a rotary encoder.

Any particular reason for needing a pot?

______
Rob
Rob Gray aka the GRAYnomad www.robgray.com

cowasaki

No it is just so easy to hook them up to the arduino and pots are cheap!  I need two devices that match, either two encoders, two pots or one of each plus two buttons.  This will be the basis of a menu driven UI for my latest device.

cowasaki

I want to use a 2 line LCD with the top line as the label and the bottom as the data.  By turning a pot from full one way to full the other way you can select which data/label combination is on the screen.  Then by turning the other device you can increase or decrease the value of the data.  I have built it already on breadboard and written the software but obviously with the stops!  If you change one piece of data then change to another there might not be enough sweep left.  The other way would be to just change the value of the new variable to whatever the position of the pot is and let the user turn it back.  This would work using two pots but it isn't ideal.

Graynomad

#4
May 13, 2011, 08:47 am Last Edit: May 13, 2011, 08:50 am by Graynomad Reason: 1
You can fudge an encoder with a rotary switch but probably can't tell direction, just that it was turned. They do give nice detents on the stops though.

Actually you can tell direction I think if you use a 6p2t switch and wire it correctly you would get values of 0, 1, 2 and 3 and the software could tell which direction from that. (just thinking out aloud, it may not work as I said but you might be able to figure the direction out with some thought.)

______
Rob
Rob Gray aka the GRAYnomad www.robgray.com

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