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by Larry_Adlard
Tue Jun 26, 2012 9:03 pm
Forum: General discussion
Topic: USB Port Current Boost (solved)
Replies: 247
Views: 91910

Re: USB Port Current Boost

Looking at Raspberry-Pi-Schematics-R1.0.pdf sheet 3, LAN9512 pins 14 (PRTCTRL2) ana 16 (PRTCTRL3) are attached to the anodes of D11 and D10 respectively. and are sensing the state of the power pins on the ports. They are NOT supplies to the 9512. On a different circuit they can be used to control a...
by Larry_Adlard
Tue Jun 26, 2012 1:34 pm
Forum: General discussion
Topic: USB Port Current Boost (solved)
Replies: 247
Views: 91910

Re: USB Port Current Boost

Not quite right. D10 & D11 are connected to inputs on the 9512 (actually, they can be configured as outputs as well, but that isn't done on the Pi). Since those will be high impedence, not much current will flow through the diodes, even if >85v is applied to them - though enough volts would destroy...
by Larry_Adlard
Tue Jun 26, 2012 12:35 am
Forum: General discussion
Topic: USB Port Current Boost (solved)
Replies: 247
Views: 91910

Re: USB Port Current Boost

Failure.. I got the Pi-Pass wired up (that was easy), but then the lower USB port fails to respond to anything. I tried 3 different keyboards before it dawned on my - "what about the top port?" - that made me feel like an idiot, but it did work. Deciding that a single-USB port wasn't gonna cut it, ...
by Larry_Adlard
Mon Jun 25, 2012 9:03 pm
Forum: General discussion
Topic: USB Port Current Boost (solved)
Replies: 247
Views: 91910

Re: USB Port Current Boost

See also Evolving R-Pi. view topic; http://www.raspberrypi.org/phpBB3/viewtopic.php?f=63&t=9192 Having started with the Pi-pass, I decided to go for a more radical level of surgery. I tried the using the video through RCA connector on an old CRT TV because I agreed with the principle of using an old...
by Larry_Adlard
Wed Jun 20, 2012 7:36 pm
Forum: Troubleshooting
Topic: crash
Replies: 24
Views: 3737

Re: crash

WIDEVIEW.JPG I live in Spain, and here the AC current is 220V/50Hz The good news is I've managed to duplicate the conditions. I was going to suggest you try powering with a battery. The R-Pi drained the battery in the time it took take a few photographs and when I measured the battery voltage it wa...
by Larry_Adlard
Wed Jun 20, 2012 7:09 pm
Forum: Troubleshooting
Topic: is this a power isssue or something else?
Replies: 4
Views: 1166

Re: is this a power isssue or something else?

Other people are having problems using a Kindle power supply. Click on http://www.raspberrypi.org/phpBB3/viewt ... =28&t=8790.
by Larry_Adlard
Wed Jun 20, 2012 10:07 am
Forum: Troubleshooting
Topic: crash
Replies: 24
Views: 3737

Re: crash

Yesterday I connected the tester all the time, since I turned on the RPI until it was frozen. The voltage between TP1 and TP2 fluctuated between 4.3V and 4.8V, with most of the time on 4.5V. The command that I put was "sudo apt-cache search java", the voltage varied widely, the results were display...
by Larry_Adlard
Tue Jun 19, 2012 11:24 pm
Forum: Troubleshooting
Topic: crash
Replies: 24
Views: 3737

Re: crash

Hello This is the last crash: I wrote"sudo apt-cache search java" and the RPi chrashed (frozen, it does nothing). I measured the volts between TP1 and TP2 and the result was 5.05V :/ For this measurement I connected LAN, keyaboard and HDMI/DVI connector. Well that more or less eliminates the power ...
by Larry_Adlard
Tue Jun 19, 2012 8:16 pm
Forum: Troubleshooting
Topic: Power Problems: my Pi is reading 6V.
Replies: 6
Views: 1965

Re: Power Problems: my Pi is reading 6V.

Okay so what the heck is wrong with this thing? I have an approved SD card using the latest debian image. However, when I plug anything into the LAN/USB it works for a minute then loses power. I have to wait until the next day to try again. I powered up the Pi tonight with only the LAN plugged in (...
by Larry_Adlard
Tue Jun 19, 2012 7:44 pm
Forum: Troubleshooting
Topic: crash
Replies: 24
Views: 3737

Re: crash

I use a kindle power supply. If I connect it only, with a tester I have measured 5.25 V. In use, I only connected usb keyboard, usb mouse, LAN, and DVI/HDMI connector. Can you tell us what the voltage is after you connect a) The Keyboard, b) Keyboard and Mouse, c) Keyboard Mouse and LAN, d) Everyth...
by Larry_Adlard
Tue Jun 19, 2012 5:50 pm
Forum: General discussion
Topic: Rebooting PI?
Replies: 2
Views: 927

Re: Rebooting PI?

I've found that plugging anything into the USB causes a hard reset. Try that and see if the network comes back up. I'm sure someone is working hard to fix these things. Just to repeat what has been said before, this phase was supposed to be 10,000 R-Pi's in development but enthusiasm for the project...
by Larry_Adlard
Tue Jun 19, 2012 5:22 pm
Forum: General discussion
Topic: What's your favourite?
Replies: 2
Views: 447

Re: What's your favourite?

Python. I think that's why it's called a Pi.
I'd be interested in Arm assembler. I'm happy with assembler for X86/Microchip/Arduino. It's probably there somewhere, I just haven't found it yet.
by Larry_Adlard
Tue Jun 19, 2012 5:15 pm
Forum: Troubleshooting
Topic: crash
Replies: 24
Views: 3737

Re: crash

@ forumisto. Have you checked the voltage across the Test points TP1 and TP2(ground). It should read at least 4.75 volts. If you look around the forum you will see many examples of instability caused by power supply problems. Some 'phone chargers can't supply the necessary power. Did you obtain your...
by Larry_Adlard
Sun Jun 17, 2012 11:03 pm
Forum: General discussion
Topic: USB Port Current Boost (solved)
Replies: 247
Views: 91910

Re: USB Port Current Boost

selsinork wrote:Now if you've got a 500 watt 'phone charger' it's probably not going to be that :)
Nice one :lol: :lol: :lol:
by Larry_Adlard
Sun Jun 17, 2012 10:00 pm
Forum: General discussion
Topic: USB Port Current Boost (solved)
Replies: 247
Views: 91910

Re: USB Port Current Boost

Hmm. only problem is that your wire-add is probably 10x thicker than the one in your micro-usb cable :( It is 7 strands x 0.2mm. I'm not using a standard 'phone charger and it's actually thinner than the twin core figure of 8 micro-usb cable. It just looks fat alongside the components. A fat wire w...
by Larry_Adlard
Sun Jun 17, 2012 7:31 pm
Forum: General discussion
Topic: USB Port Current Boost (solved)
Replies: 247
Views: 91910

Re: USB Port Current Boost

Well here it is - The Pi-pass. It simply bypasses the R-Pi and all it's fuses.

The R-Pi is full of surprises. It appears that the USB isn't hot plugable. You plug in a small device and the machine does a hard reset.
by Larry_Adlard
Sun Jun 17, 2012 2:23 pm
Forum: General discussion
Topic: USB Port Current Boost (solved)
Replies: 247
Views: 91910

Re: USB Port Current Boost

I think we are coming to a general consensus that the R-Pi needs a more powerful supply than 700ma, probably 1.5A to 2A. Remembering though that the R-Pi has a 700mA power inlet fuse. Though it won't blow at 700mA if intending to draw a substantial amount through the micro-USB socket it may become ...
by Larry_Adlard
Sun Jun 17, 2012 12:32 pm
Forum: General discussion
Topic: USB Port Current Boost (solved)
Replies: 247
Views: 91910

Re: USB Port Current Boost

On this here blog it is clearly shown with pictures how to "bridge the polyfuses"; http://theiopage.blogspot.nl/ Maybe this is what Gert was referring to? That's very helpful. I had already decided to go direct from power input to USB, but this is a lot easier. This is more protection for the power...
by Larry_Adlard
Sun Jun 17, 2012 12:13 pm
Forum: General discussion
Topic: reading code in posts
Replies: 24
Views: 3163

Re: reading code in posts

[quote="gritz" Having every user apply a hack rather than optimising something at source might be considered a good intro. for the Linux newbie though! ;)[/quote] I see your point but this isn't really anything to do with Linux. If you are going for academic excellence then you will make everything ...
by Larry_Adlard
Sun Jun 17, 2012 11:59 am
Forum: General discussion
Topic: reading code in posts
Replies: 24
Views: 3163

Re: reading code in posts

I'm also using firefox. The clincher is whether you are using the Prosilver profile as the Raspite one is pants. with Raspite it is difficult to differentiate shading the formatting is all over the place. I did switch to Prosilver and it is an improvement but it isn't a great deal better. This remi...
by Larry_Adlard
Sat Jun 16, 2012 11:08 pm
Forum: General discussion
Topic: reading code in posts
Replies: 24
Views: 3163

Re: reading code in posts

Code is a nice shade of green for me, and completely readable, but then I use the Prosilver profile which is nicely laid out. Anyone who still uses the poorly implemented default profile only has themselves to blame as the solution has been given to you. I am unclear why Linux is cited as a problem...
by Larry_Adlard
Sat Jun 16, 2012 6:33 pm
Forum: General discussion
Topic: Wireless keyboard
Replies: 34
Views: 9490

Re: Wireless keyboard

Maplin Mini Keyboard/Mouse (Cerulian) Cat N69JX with micro receiver similar to Logitech. UKL 24.99.

Plug in and go - No drivers required and saves a USB port. Works so well I haven't tried anything else.
by Larry_Adlard
Sat Jun 16, 2012 1:09 am
Forum: General discussion
Topic: reading code in posts
Replies: 24
Views: 3163

Re: reading code in posts

PS. Got the drift of your prosilver alternative for forum/board preferences but it does nothing for me. It just needs someone to alter the shade of grey to increase contrast. Simples. Since everything else is "Shades of Grey" black would be an alternative, after all code is more important than opini...
by Larry_Adlard
Sat Jun 16, 2012 12:36 am
Forum: General discussion
Topic: reading code in posts
Replies: 24
Views: 3163

Re: reading code in posts

Would it be possible to change the colour or darken the text in code boxes? I find it difficult to read and perhaps other folks do too. Just change to "prosilver" style in User Control Panel -> Board Preferences - problem solved. Obviously if you're not a forum member then all you get is the forum ...
by Larry_Adlard
Fri Jun 15, 2012 11:52 pm
Forum: General discussion
Topic: reading code in posts
Replies: 24
Views: 3163

Re: reading code in posts

It would be nice to be able to read it first and THEN decide if you want to copy and paste.

There was a time when I could see the hairs on a gnats gonads but sadly those days have passed. :D

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