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Lob0426
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Blast from the past.

Thu Feb 22, 2018 12:23 am

While digging around in my old projects I found this.
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This was a Version 1.1, I think, the sticker under the board is missing. top of the board just says Raspberry Pi (C)2011
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This board was modified to run back-powered from a 4 port powered hub.
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It ran as my WordPress server for a year or more. never had a problem with it! The F2 polyfuse has had a jumper installed crossed it. F1 still has a polyfuse, though it was upgraded to 500ma if I remember correctly. If look carefully at the first picture you will see there is no power plugged into the MicroB USB. It can be used but not needed. The hub is powered by a 5V 2A wall plug. The hub had to be modified to supply the back-power with a jumper wires ( 5V and GND). The MiniB USB connector was removed and the data wires connected to the traces. The double USB connector was removed from the Raspberry Pi board and 1/10", 1/10" spaced pins soldered in. The spacing on the board is metric so the pins needed adjustment to be straight after soldering. Then a 4 pin connector was used to connect to the hub! There are two pin headers so there was a total USB count of 5 if it was needed.
Last edited by Lob0426 on Thu Feb 22, 2018 12:42 am, edited 1 time in total.
512MB version 2.0 as WordPress Server
Motorola Lapdock with Pi2B
Modded Rev 1.0 with pin headers at USB

http://rich1.dyndns.tv/
(RS)Allied ships old stock to reward its Customers for long wait!

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Lob0426
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Re: Blast from the past.

Thu Feb 22, 2018 12:39 am

A couple more pictures.
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The revision number is 1000002 so it is a Revision 1, 256MB and the over volt bit has been blown.
512MB version 2.0 as WordPress Server
Motorola Lapdock with Pi2B
Modded Rev 1.0 with pin headers at USB

http://rich1.dyndns.tv/
(RS)Allied ships old stock to reward its Customers for long wait!

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scruss
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Re: Blast from the past.

Thu Feb 22, 2018 1:44 am

I still have a Rev 1 controlling the lights here. Perfectly good if you don't need speed, wifi or lots of USB
‘Remember the Golden Rule of Selling: “Do not resort to violence.”’ — McGlashan.

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Lob0426
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Re: Blast from the past.

Thu Feb 22, 2018 2:47 am

I moved away from this one to a 512MB model for my WordPress server. I was just surprised it fired right up. I did have to do a password recovery on it as I could not remember what it was! LOL! It gave me good service!

I still have another Rev 1 on a clipboard with a couple of breadboards for projects. It's perfect as it is.

I have a bunch of Raspii, the newest is a Zero W, everything else is a Rpi 2B or older! Just finished update && upgrade on the Motorola Lapdock with a 2B on it. I really need to get a Rpi3B for it!
512MB version 2.0 as WordPress Server
Motorola Lapdock with Pi2B
Modded Rev 1.0 with pin headers at USB

http://rich1.dyndns.tv/
(RS)Allied ships old stock to reward its Customers for long wait!

ejolson
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Re: Blast from the past.

Thu Feb 22, 2018 8:02 am

Lob0426 wrote:
Thu Feb 22, 2018 2:47 am
I have a bunch of Raspii, the newest is a Zero W, everything else is a Rpi 2B or older! Just finished update && upgrade on the Motorola Lapdock with a 2B on it. I really need to get a Rpi3B for it!
Nice pictures. It reminds me why I'm glad the newer models have mounting holes.

gordon77
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Re: Blast from the past.

Thu Feb 22, 2018 9:14 am

I was expecting to see some antique computer :D

2011 not long in the past.

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rados-dataplicity
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Re: Blast from the past.

Thu Feb 22, 2018 12:22 pm

We still got a bunch of RPi 1's gathering dust on the shelves so wasn't all that surprised to see it :D
I tinker around with Raspberry Pis daily and make sure that people can easily access theirs remotely.

Community outreach @ dataplicity.com

Pithagoros
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Re: Blast from the past.

Thu Feb 22, 2018 6:58 pm

I still have a first batch from China Pi with the stick-on CE.

Memories of being up early with three computers trying to get onto RS and Farnell first managed to get an order in, went back to bed. That was a little treasure when it arrived.

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Lob0426
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Re: Blast from the past.

Thu Feb 22, 2018 8:05 pm

No 2011 is not that old, unless you are a RasPi! Look at the number of iterations there have been so far?

Back then (2011) there was a big argument about "Back-Powering" from non-compliant USB hubs. It was true, there was a danger to the boards from having power, in to the power connector, and back from the USB ports, If the voltages do not match. Some others, and I, saw it as an advantage if there was a powered hub needed as part of the system. This was a proof of concept project, it passed with flying colors operating 24/7, 365 as a WordPress server. There were others that were just as successful! And as you saw in the pictures it still runs!

This concept is true for the A+ board and for the new Zero boards. Reference the "Hub4u" style hubs available from places like Adafruit. Though they generally go the other way of powering the hub through the Zero.

I have not seen any discussion as to "back-powering" a Zero. I would be interested to see if it is possible through the USB connector, it certainly is possible through the pads available under the board! And considering the low power consumption of the Zero definitely worth looking into again! Back-powering reduces system components and improves efficiency. These small hubs most likely have protection against back-powering if their own power connector is used.

Getting lazy I guess. I have an A+ and have never tried it!
512MB version 2.0 as WordPress Server
Motorola Lapdock with Pi2B
Modded Rev 1.0 with pin headers at USB

http://rich1.dyndns.tv/
(RS)Allied ships old stock to reward its Customers for long wait!

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Lob0426
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Re: Blast from the past.

Thu Feb 22, 2018 8:25 pm

ejolson wrote:
Thu Feb 22, 2018 8:02 am
Lob0426 wrote:
Thu Feb 22, 2018 2:47 am
I have a bunch of Raspii, the newest is a Zero W, everything else is a Rpi 2B or older! Just finished update && upgrade on the Motorola Lapdock with a 2B on it. I really need to get a Rpi3B for it!
Nice pictures. It reminds me why I'm glad the newer models have mounting holes.
Yes mounting holes are really nice.

On those early boards you had to use these edge holders, I got mine from Adafruit, or used double sided foam tape. I have a second one of these Vesa mounts with a hub in it's case. It was modified to back-power also. It used the stock board and USB connectors. It used a shortened USB A to Mini B cable. I modified the bottom port by installing a higher rating polyfuse (1A I think). That board and hub also performed flawlessly. It also was a much easier modification rather than removing USB ports and installing pins and headers. This gave better protection for the board and still allowed normal or back-powering of the board. If I remember correctly this was a 512MB board. It may be the board my WordPress server is still using!
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What do you think will it work on a stock unmodified A+?
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512MB version 2.0 as WordPress Server
Motorola Lapdock with Pi2B
Modded Rev 1.0 with pin headers at USB

http://rich1.dyndns.tv/
(RS)Allied ships old stock to reward its Customers for long wait!

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Lob0426
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Location: Susanville CA.
Contact: Website

Re: Blast from the past.

Thu Feb 22, 2018 11:00 pm

Ok, I lied to you, I actually did try Back-Powering an A+ in 2015.
viewtopic.php?f=63&t=109719

I just tried it again, yep it works no problem at all! This is the older 256MB model using Stretch. A little slow on a 256MB! I do not know if there were any changes to the newer 512MB models. If not they should work too.
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I guess I now have to try a Zero. I need to find a short A to MicroB cable. Cable length, as in short, is important if you are going to successfully try back-powering.

Ok the USB MicroB to A adapter into my A to Mini and the Zero W booted right up with back-powering. A single cable solution would be much better for this! So I would need a MiniB male to MicroB male cable.
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Warning:
I found Back-Powering to be safe. You back-power at your own risk!

Safety NOTE:
You CANNOT SAFELY power any Raspberry Pi by back-power and it's own power connector simultaneously. Use ONLY one OR the other, NOT BOTH!
Some Raspberry Pi's are protected from back-powering by a diode.

Might be time for a new back-powering discussion with the proper warnings about how it is done safely!
512MB version 2.0 as WordPress Server
Motorola Lapdock with Pi2B
Modded Rev 1.0 with pin headers at USB

http://rich1.dyndns.tv/
(RS)Allied ships old stock to reward its Customers for long wait!

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