Accelerometer Help?

[elbuo]

Does the cRIO have an accelerometer...?

[EricVanWyk]

Originally Posted by elbuo

Does the cRIO have an accelerometer...?

No. The accelerometer is a separate board.

[elbuo]

So that means we need to buy one right?

[EricVanWyk]

No, one came in the kit of parts. It is a red board that is 1" square that says Accel on it.

It is shown on page 2 of http://usfirst.org/uploadedFiles/200...r%20Manual.pdf

[elbuo]

Is it the piece connected on top of the cRIO. Connected to one of the slots?
The Digital one?

[Mark McLeod]

No. The Accelerometer came in the padded manila envelope in the KOP and doesn't attach to the cRIO modules.

It needs to be physically wired before it can be attached to anything. It's just a bare 1" square circuit board.

[elbuo]

Then we are missing it Cause I just went out to look for it and I didn't find it...
I'll keep searching....
After that I guess I'll figure my way out...



Also, I want to set a specific speed to the jaguars but I can't find where to do it.
I used all the motor examples available but none of them save the settings when I use the joystick...Any help?

[Alan Anderson]

Originally Posted by elbuo

Then we are missing it Cause I just went out to look for it and I didn't find it...

Someone should have done an inventory of your Kit Of Parts, using the 2009 KoP Checklist on the http://www.usfirst.org/community/frc...nt.aspx?id=452 page (find it under Section 10 - The Kit of Parts). Ask the person who did it whether your accelerometer board was missing, and where it got put if it was included.

Also, I want to set a specific speed to the jaguars but I can't find where to do it.
I used all the motor examples available but none of them save the settings when I use the joystick...Any help?

I'm not sure I understand what you're asking. What does "save the settings" mean?

[elbuo]

Yeah we are actually missing it.
All the teams from PR.

From what I read I can adjust the jaguars right?
I want to set a specific acceleration rate and a specific speed limit.
How can I do it?

[Alan Anderson]

Originally Posted by elbuo

Yeah we are actually missing it.

You had the chance to tell FIRST about missing KoP items the first week.

From what I read I can adjust the jaguars right?
I want to set a specific acceleration rate and a specific speed limit.
How can I do it?

You can't "adjust" a Jaguar the way you're describing it. What you can do is control its output, from full reverse to full forward and anything in between.

If you want to limit the maximum output, do it in software with a MIN() function. If you want to have a specific rate of change, do it in software by only changing the control value by a given amount in a given time until it reaches the desired value.

[elbuo]

Yeah we sent the report.
Thing is, every single team here in PR received the pack one week later.
So our order will take longer

Man I got so lost in the explanation of the jaguar
I just want to set a maximum speed so the speed never goes up what we think is the best choice. And if we limit the output then I guess that will be solving our problem. Thing is I don't know how to do it with LV if it's possible.

Which would be that software :S

[EricVanWyk]

There are many ways to implement what you want. Here are two simple methods.

The least good way to do it is using the "In Range and Coerce" VI that is under Programming -> Comparison. This will allow you to place limits on what will be sent to the Jaguar. Unfortunately, it is just a hard limit - moving your joysticks beyond that limit will just return the limit. This means that your sensitivity will be awful. I mention this option only because that VI will be useful in other situations.

A better way to do it would be to multiply your joystick value by your intended limit. If you only want 25% speed, multiply by .25 . This will allow you to use the full range of the joysticks.