Quote:
|
Originally Posted by Rickertsen2
My guess is that it is quite OK to go above 2.5Ω but as you do, your accuracy goes down. The rated accuracy of the AD converter is 1/2 bit.
|
If you look further on in the datasheet, they say that 10K is the real max. Also, a lot of this has to do with timing, and not due to voltage drop (which I know is what you said, but I am just reiterating it). I would argue that the speed that you are going to be able to change the value of a 1-turn pot in a FIRST competition is relitivitally slow and therfore wouldn't cause a huge problem, espically when the theoretical limit of updating your motors is 26ms, but likely even slower than that. However, it probally is good advice to stick with 10k, 5k, or 1k. Someone can feel free to do out the math from the datasheet and proove me wrong.
Quote:
|
Originally Posted by Don Rotolo
For the quote above, I disagree. I do not believe that the OI is reading the current, instead it reads the voltage. My thought is that the 100k limit is there to avoid issues with excessive current draw.
|
I would have to agree with Rickersen2 on this one - or at least agree that it isn't reading 0-5 voltage straight off the pin. First, if you open up a joystick, only two of the pins off the pot's are connected. This doesn't mean there isn't a fixed resistance inside the OI, but that pin on the OI is not getting a 0-5 signal from the joystick. Second, I've tried hooking up straight 0-5 sources to the OI with no luck.