First, there are posts in this thread that are confusing the RC inputs with the OI. This thread is about the operator interface, not the Robot Controller, they are different designs.
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The wiring is currently: Negative on pot to pin 4 on OI (ground). Positive on pot to pin 1 on OI (+5 V), & signal from pot
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The Operator interface is designed to work nominally with a 100 K ohm variable resistance (potentiometer or switched resistors) with only two connections as shown in IF documentation and the 2007_Guidlines_Tips_Good_practices document. It probably will generate values throughout the range of a 120K pot due to various tolerances.
Disconnecting your ground should give you a range of values of around 128 values (I forget if it is 0-128 or 128-255).
By connecting the ground you are drawing more current than intended by IFI and thus messing up their current measuring circuit and software. Connecting a pot in this manner can also cause the OI input to look like a disconnected joystick which will generate a 127 as an output value at one end of the range.
Everyone knows the best way to lose weight is to turn the robot upside down, shake vigourously, and throw away anything that falls out. - Mark Hamilton [more] 
05-02-2007, 10:26
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