Raspberry Pi Forums

AllanGH

I'll second the recommendation to do a search on "DHCP server for Raspberry Pi", and toss-in this link to the datasheet for the optoisolator you were inquiring about: http://www.farnell.com/datasheets/20079 ... 1509766665

AllanGH

I favor the Element14 graphic, myself, and have that printed out and in one of my reference notebooks, now. Thanks for that one--I missed seeing it when I was on their site. I did think that this might be worth mentioning: Over at http://rasp.io/portsplus/ they sell a small scrap of PC board that yo...

AllanGH

Pithagoros wrote: ↑
Wed Nov 08, 2017 9:41 am
or even necessarily intentional about placing the Pi antenna within 1/4λ of a reflector.

Noted. Accidents *do* occur frequently.

AllanGH

Not a problem. I had one pop off at my desk, also, and it was a trivial repair.

AllanGH

In short, the more directional your antenna (higher gain) the less power you are allowed to pump into it. Your proposition being that the nodes being discussed exceed 4W power (or even one Watt) at the radiating element? With higher gain directive antennas, the FCC relaxes EIRP limitations. When us...

AllanGH

Ah. I did not realize that the DE was the focus. My apologies.

AllanGH

One might simplify the implementation using phase-control SSRs....

https://www.google.com/search?q=phase-c ... ontrol+ssr

AllanGH

If you need the WiFi/BT, you can re-solder the aerial to the board, if you mind that you orient the dotted-end toward the corresponding dot on the PC Board.

AllanGH

Sure...the relevant authorities are very unlikely to come looking for someone who makes the sort of modifications under discussion. They are also unlikely to stumble across it. So the chance of getting caught is very low. Well, since you and I live in California, USA, that's probably the case. It's...

AllanGH

Geeze!

I read Spanish well enough, but it has been a while. I read all the way through the top half of the page, and decided that this would be interesting to tinker with a bit, then discovered the lower English half of the page....LOL.

AllanGH

Ok.....I forget that not everyone lives for flux smoke at their desk.

AllanGH

Or you could just download Debian Stretch....

https://www.debian.org/distrib/

AllanGH

For those interested in the certification application documents, please refer to the following link:
https://apps.fcc.gov/oetcf/eas/reports/ ... ABCB-RPI32

AllanGH

Greetings. I'm Allan, living in Southern California, USA. I'm a 1980's-era UNIX user, who migrated to CP/M, then to Digital Research DOS on the 8088/86 platform; and have been a happy Linux user since Mother's Day of 1995. Moving away from RH at release 8.0, I've been using Debian as my main DTOS, w...

AllanGH

Between the 5v rail that feeds the GPIO header pins among other stuff and the USB socket 5v there's a AP2553 current-limited switch. If it bears out that this is the problem component, obtaining a replacement isn't prohibitively expensive (£0.37 according to my search): https://www.mouser.com/Produ...

AllanGH

Also worthy of consideration: https://www.dxzone.com/catalog/Antennas/WiFi/

AllanGH

Fastest way to disable both WiFi and BT is to remove the 0Ω resistor on the bottom side of the RPi3B circuit board, near pin 1 of the GPIO header. https://drive.google.com/file/d/0B4ucx1mQB04AWUJLZVQ3dHFJMjA/view?usp=sharing https://drive.google.com/file/d/0B4ucx1mQB04AWUJLZVQ3dHFJMjA/view?usp=shari...

AllanGH

This is why I pointed out that I was working with the Pi3. I was framing the context of the proposed hardware modification, in that it works quite well on the 3, yet further investigation would be required to see if the relevant +5VDC trace is accessible for cutting and shunting-off to the output co...

AllanGH

Interesting. I'll definitely look at this in depth to see if it is appropriate for my some of my use cases.

Thank you for letting us know about this.

AllanGH

SteveSpencer wrote: ↑
Fri Jul 19, 2013 2:54 pm
I still have my copy of Kernighan and Ritchie, first version, none of your namby-pamby ANSI rubbish...

(grin) I have to dig mine out...did find all my Wirth books and a copy of The Cathedral and the Bazaar, though. Funny how things like that get put away and "lost" after a few moves.

AllanGH

This appears not to be the case with the Pi3, which is what I'm working with in the RPi pecking order, as the 5VDC at the GPIO header is supplying 5VDC any time the Pi3 is connected to the power supply, whereas the 5VDC at the USB ports goes dead when the board is halted at the console session, or s...

AllanGH

In theory, and I say that because I don't have a Zero in hand, one could cut the +5V trace to the MicroUSB port and bridge the gap with a very small SSR, and control said SSR via a GPIO pin; however, though I have done similarly with other development boards, and it's not a big deal, you may not wan...

AllanGH

There is a time limit on patents....normally 17 years in the US.

AllanGH

http://www.catb.org/~esr/faqs/smart-que ... 0474146768

AllanGH

Thanks for the reply, Heater. I'm one of those guys who has never used windows or Mac, sticking with Red Hat and Debian, for the most part; but have only just now started looking at the Pi for projects that PIC or Atmel can't handle. It seems that--exclusive of it being an ARM architecture--I can ap...

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