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#16
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Re: Potentiometer
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#17
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Re: Potentiometer
Can we train the watchdog to hunt trolls? Should get rid of those pesky watchdog not fed errors and clean up the forums. Win-win.
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#18
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Re: Potentiometer
If you're looking for good potentiometers, I would suggest Spectrol or Bourns.
I have a 10-turn Spectrol pot myself. Its linearity is rated within 0.25%. (typical pots don't HAVE a rating for linearity) Of course, feel free to try a cheap potentiometer, and see where it gets you. |
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#19
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Re: Potentiometer
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My point: don't get a potentiometer that will just have enough rotation to work. It won't. |
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#20
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Re: Potentiometer
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We've used 300 degree pots for about 250 degrees maximum range, with some breathing room. Matt |
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#21
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Re: Potentiometer
We use these for counting the revolutions of our motor. We mount them to the output shaft of the gearbox with a piece of surgical tubing. One of our mentors manufactured some spiffy plastic mounts that strap onto the side of the motor to hold the potentiometer. Works pretty nice.
http://www.alliedelec.com/search/pro...px?SKU=9700063 |
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#22
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Re: Potentiometer
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#23
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Re: Potentiometer
Could we get a picture of these?
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#24
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Re: Potentiometer
It's in the specs on that page (electrical rotation 340 degrees +/- 3)
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#25
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Re: Potentiometer
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#26
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Re: Potentiometer
Hey everyone. Here is detailed shots, as well as a shot giving dimentions, of the POT holder for the 2.5" CIM motor. Sorry I can't find my CAD drawing. Might of went with my computer when I had it wiped.
http://doug.devicariis.org/images/robotics/ I am sure one of you guys could recreate it in no time. I have been busy, or else I would. Have fun!! |
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#27
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Re: Potentiometer
Quick question and I dont want to start a thread about it. Do potentiometers have to be reset at all some way? Ive been tinkering with code and simply using the AnalogChannel->GetVoltage() and printing it to the console gives a voltage reading somewhere around ~30,000,000 which I assume means it isnt hooked up. No one has touched it since competition season and the potentiometer was fine since the last competition.
It is plugged into port 2 on an analog module. ![]() |
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#28
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Re: Potentiometer
What format string are you using when you print the value? The GetVoltage() function returns a float. You might have accidentally tried to print it as an int instead.
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#29
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Re: Potentiometer
That might be the problem... Im retrieving it to a double value.
And Im printing to int. Honestly I dont know how to print anything but int. Just getting to know this stuff. :/ |
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#30
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Re: Potentiometer
Here's the VEX potentiometer we used for our arm position:
http://www.vexrobotics.com/products/.../276-2216.html It worked well once we had a completed gripper on the end of the arm that _worked_... ;-) |
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