Analog in on OI: Heads Up!

[Dave Flowerday]

Originally Posted by Astronouth7303

Heads up: The OI will output 127 for what it perseves as infinate resistance. I'm not sure of the exact threshold, but my theory is that when volts <= 0.1, it outputs 127. But noise (flickers between 0 and 127) goes until about 0.110 or 0.115.

So if, as an example, you wire a potentiometer to p4_aux, when the pot. is all the way down, p4_aux=127. when it's a little higher, p4_aux=0.

also, 127 appears in it's "normal" position (midway 'round). So you can't just put in an if statement.

I hear this is by design. So watch out!

This is by design (so that when you unplug your joystick when the robot is still running, it doesn't start running it's motors full speed backwards).

If you're wiring a pot such that it can pull the analog input on the OI down to less than 0.05 volts (the spec which is stated in the OI documentation from IFI), then that means you have ground connected to the pot. Check the OI reference - this is not the correct way to wire a pot to the OI.

Besides, you already asked this question and I already answered it. Why are you posting this same thing twice?