pic: FRC-34 2009 Swerve Module w/CIM (Front View)

[tdlrali]

"anything over 360 of motion is overkill"
not at all, you get a much better response time with full rotation, since worst-case for full rotation is 90deg (you can always find the closest goal within a max of 90deg), whereas the worst-case for non-full rotation is twice that.
also, with non-full-rotation, think of the situation where you're approaching the limit from one side. as you pass through the limit, the module has to turn 180deg (or however far), which makes for really weird driving. this problem doesn't exist with full rotation

for wire wrap, in 07 and 08 (when we did non-coaxial, with cims in the modules), we simply kept track of the number of full rotations, wrote them to the eeprom (persistent across reboots), and had a software limit in the number of rotations. the "unspinning" happened either on button press or automatically during idle time (no joystick inputs).

[AdamHeard]

Originally Posted by tdlrali

"anything over 360 of motion is overkill"
not at all, you get a much better response time with full rotation, since worst-case for full rotation is 90deg (you can always find the closest goal within a max of 90deg), whereas the worst-case for non-full rotation is twice that.
also, with non-full-rotation, think of the situation where you're approaching the limit from one side. as you pass through the limit, the module has to turn 180deg (or however far), which makes for really weird driving. this problem doesn't exist with full rotation

for wire wrap, in 07 and 08 (when we did non-coaxial, with cims in the modules), we simply kept track of the number of full rotations, wrote them to the eeprom (persistent across reboots), and had a software limit in the number of rotations. the "unspinning" happened either on button press or automatically during idle time (no joystick inputs).

The other option is to go to a coaxial setup (unlimited physical module rotation with no wire rotation limits) using absolute encoders. This will allow you to spin to whatever you like, whenever you like, with no worries.

[Aren_Hill]

The whole reason I went coaxial was so the programmers couldn't break the drivetrain by spinning too far lol
with coaxial they can send whatever commands they want at it and all that would happen would be a bunch of random spinning at worst

[AdamHeard]

Originally Posted by Aren_Hill

The whole reason I went coaxial was so the programmers couldn't break the drivetrain by spinning too far lol
with coaxial they can send whatever commands they want at it and all that would happen would be a bunch of random spinning at worst

yup, can't trust those programmers

[sgreco]

Originally Posted by AdamHeard

yup, can't trust those programmers

Oh, those silly programmers...It's always a code problem

But then again, without code, the robot is just a door stop...