Re: Encoders getting different rates
 

Exactly. In my code right now I just have the distance per count set at 1 for both and they are both at 1X. I'm just going to lay out 10ft, push the robot, get the readouts for both, divide 10ft * 12 inches by the count for each side. Then I will have the distance per count for both. If that goes the way I think, both encoders will be in sync with each other afterwards. What do you think?

Re: Encoders getting different rates
 

it sounds perfect. and this test will kill 2 birds with one stone; you will be able to find the counts per foot at the same time

Re: Encoders getting different rates
 

Great! Thanks for the help. See you guys next month at Hofstra

Re: Encoders getting different rates
 

what school are you from?

Re: Encoders getting different rates
 

The letters don't tell you how many counts per revolution the encoder provides. That's in the numbers. The E4P encoders used on AndyMark gearboxes have a "250" in the part number that refers to the 1/4" shaft they go on, but they have another three-digit number that's the important one here. The KOP encoders have been 250 or 360 counts per revolution.

Find out what the full part numbers are and you'll probably see why one of them is reporting much smaller values.

Re: Encoders getting different rates
 

Comsewogue

Re: Encoders getting different rates
 

ummm....where is that?

Re: Encoders getting different rates
 

That could be it. I'll look into it

Re: Encoders getting different rates
 

Suffolk county...

Re: Encoders getting different rates
 

ok. i'm guessing you know where connetquot is, so see you there

Re: Encoders getting different rates
 

We had the same problem with ours. One side was giving reliable readings everytime, the other would give us some random garbage. We figured it out by manually rotating the axis the encoder was on by 1 revolution, and looking at the output, several times. They were very consistent, compared to the other side that would give us garbage. We looked at our wiring and found that the plastic clip the wires plug into was cracked and one of the signal wires was pretty much not connected. Pull it out and just check on it. After we replaced it, its been working fine.

If you rotate them one revolution and both sides are giving similar readings every time, then you can go ahead and scale them. For example if side A was giving you 140 and B was 360, you know that 140X=360. 360/140=~2.6. So you multiply the one side by ~2.6 to get them equal.