Bought a Raspberry pi to go with my OBi
azrobert:
drgeoff,
I really appreciate your comments.
I looked up the meaning of weedy and this cable is definitely weedy.
My Pi shipped today and I should get it Monday or Tuesday.
I found this picture of a Pi:
http://i.imgur.com/DRFtN.jpg
I don't know if this Pi is the current version.
I see the large contacts by the phono socket.
I was thinking using the positive and negative contacts by FD3 (upper left by the Micro USB connector).
Is this OK?
There is an open space on the board to the right where I can super glue the barrel connector.
Hopefully it will fit an open case like this:
http://www.amazon.com/Kootek-Transparent-Clear-Raspberry-Enclosure/dp/B00E8CB0XC/ref=sr_1_19?ie=UTF8&qid=1398360618&sr=8-19&keywords=raspberry+pi+case
Anyway, this is going to be my last option.
When I built this cable I didn't want to deal with soldering thin wires.
I exposed the USB contacts and soldered the female barrel connector to the contacts.
I checked the polarity about 3 times.
I will check again before using it with the Pi.
I did some reading last night and this is turning into a learning experience.
They recommend a .75 AMP PSU for the Pi.
My PSU is almost 3 times that at 2 AMP.
More power is not a problem, the device will only draw what's needed.
Again, is this correct?
My cheap cable will have more resistance, so less power will get to the device.
I decided not to use my WiFi adapter, reducing the power requirement.
I'm not going to use any peripherals on the Pi.
I will use software apps to update/monitor the Pi, further reducing power req.
See: http://www.dslreports.com/forum/remark,29175362
Hopefully my PSU will work with the above.
Any faults with my logic?
I have another option and might try this first.
I have a tablet that I only use when we travel.
It has a 5v 1.5 AMP PSU.
It's about twice as heavy as a cell charger and the cable is shorter and about 50% thicker than the cable I'm using above.
I could use this PSU with the Pi and use above PSU with the tablet.
I tried and it does recharge the tablet.
Thanks again!
drgeoff:
1. That is an old board, just like my two delivered May/June 2012. Since 18 months ago they all have mounting holes. However the current ones are very similar to the picture.
2. The four relatively large plated through holes with FD3 in their midst are all connected to the metal casing of the micro-USB connector. My resistance measurements suggest there is a diode between those and the negative supply.
3. Although there are no components in the area you mention, there are vias which are only protected by varnish. You need to be sure there is no possibility of that protection being damaged and a via coming into contact with any metallic part of the barrel connector.
4. As you appear to realise, it is preferable to use the existing micro-USB connector. Resistance is proportional to length so even a weedy cable can be OK if kept short.
5. Your 2 amp supply is fine. The RPi just takes what it needs. A PSU that has a massive current rating can be a problem as some don't regulate well when very lightly loaded. But your one is not in that ballpark.
6. A combination of ssh (using eg the putty program) and a web browser is entirely adequate for initial configuration and day to day updates of RasPBX. If you are using wired ethernet (rather than Wi-Fi) you don't even need to attach a keyboard/monitor at all if your router can tell you the address assigned by DHCP.
giqcass:
Once again I am having installation issues. I thought I might share the problem and solution. I tried the one click install for Wolfram Alpha. I don't know what the deal is but the system decided to save the installation files incorrectly. For instance
wget http://nerd.bz/w8HCDF saves the file as w8HCDF instead of using the file name. As a result I had enter each link into a browser to find the actual file locations then download them and unzip them manually. I eventually got it working after a lot of manual tinkering. ;D
So far the system seems stable. I may use the PI for my primary outgoing if it continues it's solid performance.
drgeoff:
Quote from: giqcass on April 25, 2014, 01:57:15 am
Once again I am having installation issues. I thought I might share the problem and solution. I tried the one click install for Wolfram Alpha. I don't know what the deal is but the system decided to save the installation files incorrectly. For instance
wget http://nerd.bz/w8HCDF saves the file as w8HCDF instead of using the file name. As a result I had enter each link into a browser to find the actual file locations then download them and unzip them manually. I eventually got it working after a lot of manual tinkering. ;D
So far the system seems stable. I may use the PI for my primary outgoing if it continues it's solid performance.
Strange. I didn't have any of those issues when I tried Wolfram Alpha a couple of months ago.
giqcass:
Quote from: drgeoff on April 25, 2014, 04:04:52 am
Strange. I didn't have any of those issues when I tried Wolfram Alpha a couple of months ago.
Despite my troubles the hardest part of the setup...........
Coming up with a good question to ask Wolfram Alpha. lol
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