Quality problems with parts

[RyanN]

Originally Posted by Joe Ross

Like Nirvash said, issues 1, 3, and 4 are likely all related to not powering the Digital Sidecar correctly.

So the 5V light was on, just not the 6V. Looking at the schematic, the 6V power should have nothing to do with anything but powering servos on the DSC. Since 5V was working, the PWM interface should have worked. To fix #1, they replaced the DSC. The defective DSC came straight from the anti-static bag to the robot.

The tubing cut might have been the issue, but we went back with some that we've had around since my time and they're working just fine.

#3 is still an issue. However, it appears to be more of a controls issue. When the robot is disabled, the input reads correctly in the Periodic Tasks, but when it goes to Teleop, the input just reads low. I haven't had much time to look at the underlying code for this year, but it doesn't appear to be anything the students are doing to cause the problem. In other words, the behavior is completely undefined and does not logically make any sense.

[Alan Anderson]

But was the BAT light on?

Seriously, everything you've described (excepting the pneumatic leaks) points to the Digital Sidecar not getting battery voltage to its power input. It'll get a tiny bit of leakage through the ribbon cable from the DIO module that makes things seem to work, but everything will quickly get flaky, especially if you have only a few motors defined or try to run more than a couple of them in reverse at the same time.