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by 0117blocky
Sun Sep 16, 2012 11:39 pm
Forum: General discussion
Topic: A RPI USB power question
Replies: 10
Views: 2648

Re: A RPI USB power question

I would wait until you receive your RPI before thinking about any modifications, of course I do not know what you plan to connect to the usbs. The test points on my RPI which has usb fuses, look quite easy to solder wires too. The Micro usb I think is rated to at least 1amp maybe as high as 1.5amp.
by 0117blocky
Sun Sep 16, 2012 10:05 pm
Forum: General discussion
Topic: A RPI USB power question
Replies: 10
Views: 2648

Re: A RPI USB power question

As you are planning to use flying leads to the usb 5V connections. You could use flying leads to Tp1 and Tp2 to power the RPI it would save use of the gpio port. I wouldn't have thought the test points would be on thin tracks. If you have fuses on your 5v usb tracks you could solder leads to the usb...
by 0117blocky
Mon Sep 10, 2012 11:07 pm
Forum: General discussion
Topic: Prototyping
Replies: 2
Views: 569

Re: Prototyping

Take a look at the 74HC138 and the 74HC245 if you want to extend the interfacing capabilities of the gpio pins by multiplexing. The HC and AC families of logic IC's can be supplied from 3V3 or 5V
by 0117blocky
Tue Sep 04, 2012 11:06 pm
Forum: General discussion
Topic: using 4 AA batteries to power the Pi
Replies: 52
Views: 39023

Re: using 4 AA batteries to power the Pi

I used a 3LR12 4.5 volt battery and a Max 757 max current 200mA @ 5V step up switching regulator to power a micro controller board which I made years ago. So I looked up Step up Switchers and the Max 8969 from Maxim may suit your needs http://www.maxim-ic.com/datasheet/index.mvp/id/7505
by 0117blocky
Wed Jul 18, 2012 2:58 pm
Forum: General discussion
Topic: Raspbian is finally, formally here!
Replies: 46
Views: 10877

Re: Raspbian is finally, formally here!

I've just swapped from Wheezy to Raspbian and the GUI is a lot slicker to use.
Cpu usage is less while I'm typing this in. You Guys who are responsible for this version
should be proud of yourselves.

Thank you.

Mark

Ps I have not had to touch the config file to adjust the screen:)
by 0117blocky
Sat Jul 14, 2012 11:54 am
Forum: RISCOS
Topic: RISC OS on Raspberry Pi
Replies: 356
Views: 135561

Re: RISC OS on Raspberry Pi

@Phil Speigel.
Thanks for the video tips but didn't get any improvements.
by 0117blocky
Fri Jul 13, 2012 9:11 pm
Forum: RISCOS
Topic: RISC OS on Raspberry Pi
Replies: 356
Views: 135561

Re: RISC OS on Raspberry Pi

Glad I could help. You are right Basic is a lot like riding a bike.
by 0117blocky
Fri Jul 13, 2012 6:57 pm
Forum: RISCOS
Topic: RISC OS on Raspberry Pi
Replies: 356
Views: 135561

Re: RISC OS on Raspberry Pi

Auto 10,10 will give you automatic line numbering.
Type a few basic lines.
type in RUN
CLS clear basic window
NEW will erase program.
HELP should help you:)
by 0117blocky
Fri Jul 13, 2012 6:50 pm
Forum: RISCOS
Topic: RISC OS on Raspberry Pi
Replies: 356
Views: 135561

Re: RISC OS on Raspberry Pi

From memory. Select SD card on task bar open utils Folder Select !MultiTask program which should then appear on taskbar then mouse over icon and click for menu to appear and there is a basic edit option select that. Click on that and a basic edit window should appear. Please bare in mind I've only j...
by 0117blocky
Fri Jul 13, 2012 5:16 pm
Forum: RISCOS
Topic: RISC OS on Raspberry Pi
Replies: 356
Views: 135561

Re: RISC OS on Raspberry Pi

I just tried Risc OS as I only have a 4:3 monitor the text was too small, but did manage to type a couple of lines of basic. I couldn't read the help text in the basic editor or on the command line. The screensize is bigger than a letter box so you can have a look around, the windows and menus are a...
by 0117blocky
Thu Jul 12, 2012 12:09 pm
Forum: General discussion
Topic: Lower temperature support
Replies: 19
Views: 3795

Re: Lower temperature support

This thread has got a bit silly, so I'm going to add to it. People put playstations in cars which are designed to operate at normal room temperatures the only time they remove them is to stop them being stolen and not frozen. Slightly more serious note. The component I would worry the most on RPi is...
by 0117blocky
Wed Jul 11, 2012 4:54 pm
Forum: General discussion
Topic: Will you ever buy another brand of embedded board?
Replies: 13
Views: 2376

Re: Will you ever buy another brand of embedded board?

I would agree that the support for the RPi is one of it's major selling point as well as cost. But to use it as a micro controller it can be a bit of an overkill, plus the power consumption its very high compared to an AVR or PIC. Micro controllers have independent counters,timers, AtoD, etc all acc...
by 0117blocky
Sun Jul 08, 2012 6:34 pm
Forum: General discussion
Topic: Dead Pi's
Replies: 7
Views: 1583

Re: Dead Pi's

I just tried disable_overscan = 1 and it did not work, I ended up with large black boarders, so I reverted to the four overscan values and used -48 instead of 40.
But thanks again.
by 0117blocky
Sun Jul 08, 2012 6:01 pm
Forum: General discussion
Topic: Dead Pi's
Replies: 7
Views: 1583

Re: Dead Pi's

No I havn't but will give it ago when I have time but thanks for the tip:)
by 0117blocky
Sun Jul 08, 2012 4:12 pm
Forum: General discussion
Topic: Dead Pi's
Replies: 7
Views: 1583

Re: Dead Pi's

I too was a bit concerned with all the issues being posted on the forum. Power was the main one. But while I,m typing this cpu usage is quite high so I've just measured the voltage across TP1 and TP2 it reads 4.67 volts. Without the power hub it would read 4.65 volts (Will read 4.73v with low cpu us...
by 0117blocky
Wed Jul 04, 2012 2:31 pm
Forum: General discussion
Topic: RasPi power usage measurements ALL Models
Replies: 156
Views: 291593

Re: RasPi power usage measurements ~2 watts at idle

I think you will find the current draw from the LEDs is lower than that as each LED needs about 1.8v to 2V applied to them. Which would mean the 1K resistor would drop about 1.3V to 1.5V therefore the current would be in the region of 2mA for each LED.
by 0117blocky
Tue Jul 03, 2012 1:06 pm
Forum: General discussion
Topic: Adequate Power Supply Critical to Pi Stability
Replies: 78
Views: 26736

Re: Adequate Power Supply Critical to Pi Stability

My Raspberry Pi is from Farnell batch no 1218 While I'm still waiting for a SD card I took some readings of voltages and resistances. Fuses. F1 = 3.1 ohms F2 =2.9 ohms F3 =0.5ohms These readings include meter lead resistance of 0.2 ohms. My two psu's across TP1 and TP2 Blackberry 700ma charger reads...
by 0117blocky
Thu Jun 21, 2012 9:54 pm
Forum: General discussion
Topic: Farnell slight delay
Replies: 48
Views: 8022

Re: Farnell slight delay

I ordered my Pi on the 30/4/12 from Farnell, who informed me I should expect a delivery date in September. Yesterday I received an email stating my Pi has been dispatched and today it arrived in the post. The trouble is, I am going on holiday for 10 days tomorrow so my Pi will stay in it’s box. I al...

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