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How can i get reading from a potentiometer on a computer? Answered

a Potentiometer, like the one in the picture I want to be able to get the reading of that on the computer...like numbers from 0 to 255(or whatever) Maybe through the serial post,if there is an instructable for this show me if not then tell me how

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ReCreatedexhand

Answer 9 years ago

It uses a servo, expensive stuff...Won't work...

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Derin

9 years ago

Use a AVR or PIC with serial comms and connect the pot to the ADC input.

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stuuf

9 years ago

One way is to use a USB to I²C bridge and an I²C A-D converter. Or a USB GPIO board with analog inputs, but the I²C adapters tend to be cheaper, and are also easier to stack multiple sensors on a single USB interface.

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frollardstuuf

Answer 9 years ago

Stuff has it right - you need an analogue to digital converter - and it has to 'talk' serial so the computer can read it. An easy method would involve a dev kit like Arduino (open source, easy to learn). The arduino reads the pot, then sends the signal to the computer via serial over usb.

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ReCreatefrollard

Answer 9 years ago

hmm yeah another thing is maybe through the joystick connector...ever looked inside a joystick?...yeah

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stuufReCreate

Answer 9 years ago

yeah, i just thought about the joystick/gameport too. I think the axis positions are just sent as analog voltages, so the interface to a pot would be really simple (or take an old joystick and wire your own pots to it). look in your attic for an old computer that still has a gameport and try it :P

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frollardstuuf

Answer 9 years ago

Great idea! I never knew gameport was pin-for-pin analogue.

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ReCreatefrollard

Answer 9 years ago

yeah if you stick your screwdriver in between two pins the x or y will change to full 100%

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ReCreatestuuf

Answer 9 years ago

yeah...my computer has a gameport but if i disconnect even just one of the cables...the computer complains that there is a problem and stops viewing the x and y I would have to make a bunch of dummy connections to make it work also i only have one joystick...and i don't want to risk destroying it so i will probably buy another...or the cable itself