Quote:
Originally Posted by Owen Makin
What would be considered a significant distance? And what problems would start to occur?
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This comment mostly applies to the cables connected to the Analogue Breakout Board. With the type of components you have in your typical robot, I would not want to run signal cables adjacent to power wires for more than 6 inches.
The current flowing in one wire will induce a current in a wire adjacent to it. This effect is stronger if the lenght of the wires adjacent to each other is longer, the wires are closer to each other or the current is higher. The induced current becomes and error in the second circuit, commonly called "noise", and may cause erroneous operation. Wires crossing at an angle, say greater than 30 degrees or so, will experience much less coupling.
Quote:
Originally Posted by Al Skierkiewicz
C,
One of the biggest reasons to not remove the modules and use jumpers to feed them is design. I look at the modules and the function they are designed to perform and think that performance can only be degraded by remoting them on the robot. You can use ribbon cables extensions for all of the interfaces, the DIO and solenoids work very well for this. The analog interface is a little more difficult since it has a power supply on it.
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The Analogue Breakout Board has a buck converter to drop the input voltage from 6~12Vdc down to 5Vdc to bias or power any external circuits such as potentiometers. Since Analogue Input Module has a resolution of 12-bits and its input currents are very low (input impedance of 1Mohm), the one or two feet of wire between the ground reference of the power supply and the ground reference of the Analogue Input Module will not cause a measurable effect.