When browsing around the Vex website, I found that some sensors had new V5 versions. But others didn’t. Such as the bumper switch V2 and the vision sensor. But it was hard to understand why there weren’t newer versions of the older sensors. Such as the Gyroscope. Is it likely Vex will release new ve…

Well that was before VexU teams heard that beyond 8 motors will lower your motor torque

is that because the robot battery doesn’t offer enough current. In Vex U wouldn’t they be able to legally add a power expander by making modications?

Nope, as a VexU team member at worlds, our motors must interface directly with the brain. We can have an extra transmitter or robot battery for secondary electronics, but they cannot drive the motors. It is also worth mentioning that V5 motors are hard to interface with, after fixing one motors, I …

The V5 battery can produce up to 20A so each motor in normally limited to 2.5A. Whenever you have more than 8 motors plugged in (not just running), the firmware automatically limits each one to 20 / the number of motors plugged in amps, resulting in a lower maximum torque.

A power expander can be used for powering more motors. With Vex u a modification will be more likely.

[image] CarCar: A power expander can be used for powering more motors. With Vex u a modification will be more likely. Power expander is a Cortex accessory. There is no V5 version of it yet, unless I missed something . So the only motors you can use with power expanders are 393, which are pr…

The problem with the power expander is that we can’t modify the brain nor the battery. Because of this, we are limited by Vex’s software current limits. The 20A limit is not a limitation of battery chemistry as much as it is a safety to prevent overheating.

VEX would actually have to release a V5 power expander though, and I highly doubt that’s anywhere but near the bottom on their list of priorities, probably somewhere just above releasing the V5 SDK. What they could do is let the user set the current limits for each motor (up to 2.5A) at runtime such…

I guess Vex U team are better off with using the cortex in that case if it’s easier to modify and configure.

Also nope, VexU must use V5. There are days we wish we could go back, but V5 still works pretty well.

V5 eletronics(V2)

VEX V5 General Discussion New Product Ideas

Wes8 August 6, 2019, 7:03pm 23

So in the future, VEX U teams may be able to use 20 motors without significant performance penalty if only a few are running at once.