Position range with potentiometer

10 years 11 months ago #29525085 by bonaducci
Using a gear motor and potentiometer in RC mode as \"jumbo\" servo. How do I set the angle or \"throw\" limits left and right? It only moves through about 20 degrees each way. I need around 90-180 degrees each way. How do I make that adjustment?

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10 years 11 months ago #29525086 by cosma
Replied by cosma on topic Re:Position range with potentiometer
you should be able to move your motor so that it reaches one end or the other of the feedback potentiometer.

For troubleshooting, it is best to use the Roborun PC utility.

This way you can see what the feedback potentiometer reading is at any time and you should verify that the motor reaches the position where the feedback equals the command value.

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10 years 11 months ago #29525087 by bonaducci
Where exactly in Roborun would I see this?

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10 years 11 months ago #29525088 by bonaducci
Also....and this may be a dumb question. To use the Roborun utility to troubleshoot the motor, I have to pull off the plug that has the potentiometer/RC inputs and connect a cable between the controller and computer.....so how am I supposed to monitor potentiometer with it unplugged?

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10 years 11 months ago #29525091 by cosma
Replied by cosma on topic Re:Position range with potentiometer
You will need to bring the RS232 signals (pins 2,3, and Ground 5) to the PC com port. This will require soldering of wires, or that you make a cable assembly like the one shown in the Manual under \"Data Logging Cable\" in the RS232 section.

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10 years 11 months ago #29525097 by bonaducci
I have 5v at the potentiometer, I turn it by hand and get the full 0-5v. When I hook it up to the controller, it turns either way a fraction of a volt. Am I missing a setting somewhere? I have it on RC mode, Position A&B, Analog feedback. The adjustments on my RC controller are all at a 100%.

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10 years 11 months ago #29525098 by cosma
Replied by cosma on topic Re:Position range with potentiometer
Check the voltage at your pot. You should have 0V at one end, 5V at the other. The middle point should vary between 0 and 5V as you move the shaft.

Check that you see the same variable voltage at the analog input pin on the connector. If you dont, check your wiring. The controller cannot alter whatever comes out of the pot.

If the voltage is present on the connector, you should see the ANA1 (2 3 or 4 depending on which input you used) box on Roborun vary from -127 to +127 as the input changes from 0 to 5V.

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