Wiring a router without a VRM

[BitTwiddler]

Or perhaps you could use one of these https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
It's an adjustable buck/boost voltage regulator that you can set to 12 V output at 25W (a smidge over 2A). I have one and it does a good job.

[Jpatterson1710]

Until teams receive the correct wiring to supply VRM power to their radios, you should be able to power them via ethernet (PoE) from the RoboRio.

[Mark McLeod]

Originally Posted by Jpatterson1710

Until teams receive the correct wiring to supply VRM power to their radios, you should be able to power them via ethernet (PoE) from the RoboRio.

Um, no.
The roboRIO doesn't provide POE. That would require a power injector (powered from a VRM or similar buck boost supply).

[Jpatterson1710]

Originally Posted by Mark McLeod

Um, no.
The roboRIO doesn't provide POE. That would require a power injector (powered from a VRM or similar buck boost supply).

Huh, I was told our by our FTA that the local teams got their robots running at Quick Build via PoE. I'll have to clarify how that worked.

[rich2202]

As a test robot, you can put a 2nd battery that only powers the radio. that would avoid brownout problems. If the robot is not moving, then you can plug the radio into an AC power supply. Or, battery->dc to ac converter -> 110v to 12v dc power supply -> radio

[FrankJ]

If your radio pulls more than 2 amps, it is already broken. The extra ampacity of the PDB just lets the broken radio smoke a little more. The big issue is brown outs will reset the radio. For limited testing I wouldn't have any issues. You can always put an in line fast blow fuse,

[Mark McLeod]

Originally Posted by Jpatterson1710

Huh, I was told our by our FTA that the local teams got their robots running at Quick Build via PoE. I'll have to clarify how that worked.

POE setup requires a way to inject power from a VRM into the radio alongside the roboRIO-to-radio Ethernet communications.
Here's an example:

[Brutick]

Originally Posted by Mark McLeod

POE setup requires a way to inject power from a VRM into the radio alongside the roboRIO-to-radio Ethernet communications.
Here's an example:

You can use 12V passive PoE to power the radio? The silk screening claims 18-24V PoE only. Unless you're using the 802.3af port which would violate R63?

We're looking into doing this, I ended up ordering some boost converters, but if I don't need them then I'm not going to use them.

[Mark McLeod]

Originally Posted by Brutick

You can use 12V passive PoE to power the radio? The silk screening claims 18-24V PoE only. Unless you're using the 802.3af port which would violate R63?

We're looking into doing this, I ended up ordering some boost converters, but if I don't need them then I'm not going to use them.

Read the label on the back of the OM5P-AN radio.
Note: This is only for the older OM5P-AN radio. The New OM5P-AC is looking for 24v on the Passive POE port.

POE Input:12-24v in the port closest to the barrel input.
The 802 port wants 48v

[Brutick]

Originally Posted by Mark McLeod

Read the label on the back of the OM5P-AN radio.
Note: This is only for the older OM5P-AN radio. The New OM5P-AC is looking for 24v on the Passive POE port.

POE Input:12-24v in the port closest to the barrel input.
The 802 port wants 48v

Good to know. Thanks!

[frodobaggins05]

If you're just using it for testing I advise you just use an ethernet cable. It's much easier than all the work of setting up a bridge