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Introducing OpenPlotter hats!!!
(11-26-2018, 05:32 AM)ningu Wrote: Hi,

I just got everything working with Moitessier HAT.  But I haven't tested it on board yet.  Before I can do so, I need to solve how to supply power to it from the boat's electrical system.  The Raspberry Pi needs >2.4 A and the average USB plugs for 12v systems I've found get up to 2 A at most.  I got myself an UBEC, but instructions I've found everywhere say to connect it to GPIO pins I can't use because I have the HAT on.  I thought I could solder the UBEC to a micro-USB plug directly, but the specs I've read for the plugs say they can only hold 500 mA (?).  How do you supply power to the Raspberry+Moitessier from your 12v circuit?

Cheers


I found a step down on amazon that was rated at 5v3a 15w

GEREE DC-DC Converter Step Down Module 12V to 5V Micro USB Output Buck Power Adapter https://www.amazon.com/dp/B00O6RJLQC/ref...aCb1JRD8EB



That said I have the touchscreen display hooked in and it’s borderline powering both. So I actually power the board and tried using an inverted and another usb 2.5 amp power supply directly to the touchscreen. That seems to work so I will be ordering another step down. Or two for spares. I just found a 12 volt usb hub as well which should help.

I also thought of flat ring connector under the hat on a 5volt pin and ground pin. Anyone tried this route?


Sent from my iPhone using Tapatalk
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I think you will find that the RPI current requirements considerably exceed the originally specified current limits for micro-USB connectors. It has never been a problem. You shouldn't have any issue with soldering directly to a micro-USB connector for your power. Connecting to the 5V GPIO pins has a little more risk, as there is no protection on those pins.

BTW, I use one of these for 5V supply. It works great, but I am finding that if it is disconnected from a load, it generates RF noise in my radio.

https://www.amazon.com/gp/product/B00FXNN7YA

I would stay away from the 3A buck converters. A few of us have tried them and found they didn't perform well.
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(11-30-2018, 10:14 AM)abarrow Wrote: BTW, I use one of these for 5V supply. It works great, but I am finding that if it is disconnected from a load, it generates RF noise in my radio.

https://www.amazon.com/gp/product/B00FXNN7YA

I would stay away from the 3A buck converters. A few of us have tried them and found they didn't perform well.

installed this one last year. Works very well, even for the UPS Pico, which is very ticklish on voltage drops. The 3A converters couldn't deliver 5V stable on load. Additionally it is waterproof
https://www.amazon.de/gp/product/B01ENT1...UTF8&psc=1
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