A real puzzle - Electromechanical fault

[kevin.li.rit]

If you're driving directly off a cimplebox, then I would say your gear ratio is too low. Especially when you turn.

[mr_yes]

@Kevin: 4 wheels, each directly connected to their own CIMpleBox with a single CIM driving. Long robot. 6 inch wheels. No, the conventional wheels were just stuck onto the hubs off the CIMpleBoxes.

@Alan: Yes, we're using the 12V to 5V converter off a branch circuit. No rewiring done.

@Coffeeism: That's actually what I'm hoping, because I know what to do about that. However, I'm puzzled about why it was working in holonomic mode originally.

Thanks everyone for the suggestions. If you got more, I'll take 'em!

[MrForbes]

4 wheel, long wheelbase, not enough gear reduction, and it doesn't move, but draws a lot of current....that sounds about right. You have a mecanum drivetrain, but no mecanum wheels. You probably should not expect it to be able to turn, sorry.

As for why it doesn't work when you put it back, I don't know.

[Ether]

Originally Posted by mr_yes

Yes, we're using the 12V to 5V converter off a branch circuit.

What's a "branch circuit" ?

The 12V should be coming from the 12V regulated supply on the PDB.

[slijin]

Originally Posted by Ether

What's a "branch circuit" ?

The 12V should be coming from the 12V regulated supply on the PDB.

Also see R42B. The current draw incurred by turning your robot causes a voltage dip which reboots your radio. The regulated supply highlighted above is designed so that voltage dips of the magnitude you're seeing (I'm assuming that your bridge isn't connected to this power supply) won't power cycle the DAP.

Did you switch out your battery at any point? If you didn't, that would probably explain why the issue recurred after you returned to mecanum.

Ether, branch circuits seem to be implicitly defined in the manual as anything powered by a fused connection.

[Tom Line]

Order Omni wheels and put them on either the front two wheels or the back. This will allow you to turn.

Long wheel bases with 4 traction wheels at the corners will not turn.

[kevin.li.rit]

Originally Posted by mr_yes

@Coffeeism: That's actually what I'm hoping, because I know what to do about that. However, I'm puzzled about why it was working in holonomic mode originally.

Could it be that originally your robot was under a lighter load without the rest of your components?

If you can afford the weight you can swap out your cimple boxes for toughboxes. My team is running 8" mecanum wheels of 4 toughboxes with no issues.

[Retired Starman]

Try a different battery. Your battery may show correct voltage but may not be able to supply current under load. This is a classic symptom with car batteries.

Dr. Bob

Chairman's Award is not about building the robot. Every team builds a robot.