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 Raspberry Pi, Rm100 computer that beats iPhone4S

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totally_skint
post Dec 24 2012, 04:40 PM

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QUOTE(quadcube @ Dec 24 2012, 12:29 AM)
seems weird..every time i shutdown my pi,i would have a hard time getting it to boot,i have to leave it unplug for a few hours before it could boot normally.anyone experiencing the same problem?
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Hot memory card?
Which one are you using?

Can you describe what you mean by "hard time getting it to boot".
What happens if you don't leave it unplugged for a few hours?
totally_skint
post Dec 25 2012, 09:17 AM

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QUOTE(quadcube @ Dec 24 2012, 05:05 PM)
well,using a class 10 sandisk ultra sd card..well,when ever i turn it off,i couldn't boot it up
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Try another card.
totally_skint
post Dec 25 2012, 08:24 PM

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QUOTE(quadcube @ Dec 25 2012, 02:46 PM)
window doesn't even detect my card,thats the problem,haha! using an ipad charger,2.1A,plenty of power since i'm running headless,no keyboard mouse or anything drawing power from the pi
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What OS have you got installed in your SD card?
And how did you install it?
totally_skint
post Dec 30 2012, 09:04 AM

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How do I get RaspBMC to output video via composite?
Old CRT TV shows no signal.
totally_skint
post Dec 30 2012, 11:46 AM

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QUOTE(C-Fu @ Dec 30 2012, 09:16 AM)
old crt got problem lah kot. my composite to vga adapter in lowyat works well enough.
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But how did you get signal out via composite (settings or is it auto detect>)
totally_skint
post Jan 1 2013, 09:38 PM

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QUOTE(pysh @ Jan 1 2013, 07:40 PM)
it should be auto detect.. unlike audio you have an option to change from audio jack or HDMI.
Suspect your TV resolution cannot cope hence giving no signal?
Try plugin to HDMI TV and set resolution to lower ones and try again?
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Will try the resolution settings.
Currently set to 900x1600 because it's connected to 20" LCD monitor via DVI.
Does Raspbmc auto detect the monitor's resolution?
I did not set video resolution.
I just installed Raspbmc and it was already set to 900x1600 when I checked video settings.
totally_skint
post Jan 3 2013, 12:49 AM

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QUOTE(quadcube @ Jan 2 2013, 10:41 PM)
[attachmentid=3239816]

completed the 5v regulator for the pi biggrin.gif
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Nice!

How many amp output?
And how many volts going in?
totally_skint
post Jan 4 2013, 09:11 PM

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QUOTE(C-Fu @ Jan 4 2013, 04:33 PM)
using ipad/iphone/ianything charger won't get you 5v. only 4.6v. that alone BARELY powers up the RPi. let alone with other devices.

I never trusted apple to make good enough product, and this furthers my belief biggrin.gif
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When I first got my Pi I used the only adapter in the house with a micro USB connector, the Samsung Galaxy Mini 5V 0.7A adapter and it worked fine.
Later I tried with the 5V 0.7A adapter from a Galaxy S2 and had erratic booting and won't power my USB keyboard or mouse.

The Galaxy Mini adapter had 3 square pins while the S2 one uses two round pins.
totally_skint
post Jan 5 2013, 12:45 AM

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QUOTE(C-Fu @ Jan 5 2013, 12:03 AM)
a simple way to check if the power supply powers your RPi correctly is to plug it into RPi and buy a cheap RM10/20 multimeter and connect the multimeter's black + red cable to the RPi lah.

if it says anything below 4.7 then you're in trouble
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I know that.
Just making the point that what's basically the same product from the same company is not necessarily the same.
totally_skint
post Jan 5 2013, 10:53 AM

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QUOTE(I<3LYN @ Jan 5 2013, 09:36 AM)
thundermatch is hugely overpriced compared with the official price which is 35USD...  sweat.gif
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Phew! RM160!!!

Is that with case like in Thundermatch picture?
Glad I got mine from E14 earlier.


Added on January 5, 2013, 11:06 am
QUOTE(C-Fu @ Jan 5 2013, 04:46 AM)
anyway, I'm thinking of making few on/off switches/buttons that connect to the RPi - say, 20, 30 buttons - that on pressing it will execute a command (whatever command, be it in python or xbmc or whatever doesn't matter). Does anybody have any idea as to where to start?

I'm guessing the setup will be something like

buttons -> breakout board -> GPIO RPi

any idea guys? the breakout board (or something that can interface with 30 buttons) prolly needs to have tons of input that connects to the buttons.... no?
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You could start here > buttons_and_switches

This post has been edited by totally_skint: Jan 5 2013, 11:06 AM
totally_skint
post Jan 5 2013, 06:37 PM

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QUOTE(C-Fu @ Jan 5 2013, 11:34 AM)
but this is only for one or maybe 2 or 3 or a few button. i want to control at least 20, 30?
it's for my arcade project  brows.gif
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You would need a keyboard matrix circuit.
12 GPIOs in a 6x6 configuration would give you 36 keys

Keyboard Matrix Circuit

This keyboard matrix board is from a DIY game controller.
» Click to show Spoiler - click again to hide... «


This post has been edited by totally_skint: Jan 5 2013, 06:38 PM
totally_skint
post Jan 6 2013, 09:04 AM

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QUOTE(C-Fu @ Jan 5 2013, 09:40 PM)
kb matrix circuit eh? how'd you go about making one? looks simple enough.

would it be simple to just buy a normal keyboard, cut the usb cord into GPIO-compatible wiring and somehow attach a wire that goes to the plywood board that has buttons?
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Keyboard Hack

For keyboard matrix just google Mjoy16. It's a DIY game controller. You just want the KB Matrix board not the main controller.
Adapt the concept to your own needs.


Added on January 6, 2013, 9:05 am
QUOTE(I<3LYN @ Jan 6 2013, 12:31 AM)
I just made a laser-cut clear acrylic case for my pi  brows.gif

if anyone want a laser-cut acrylic case, please let me know  biggrin.gif
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All I need are just two pieces (with holes) to hold my Pi sandwich style. smile.gif

This post has been edited by totally_skint: Jan 6 2013, 09:16 AM
totally_skint
post Jan 8 2013, 12:16 AM

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QUOTE(C-Fu @ Jan 5 2013, 11:34 AM)
but this is only for one or maybe 2 or 3 or a few button. i want to control at least 20, 30?
it's for my arcade project  brows.gif
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Just had a thought about your button requirements.
Have you considered jukebox type selector keypad to choose ROMs to load?
Two rows of letters and numbers.
For 30 items to choose you'll just need two rows of 5 and 6 buttons.
5 of letters A - E and 6 of numbers 1 - 6.
To select any item, just press A2 or D4 etc., etc.
You'd only need 11 GPIOs and no need for so many wires or diodes as in keyboard hack or the keyboard matrix board.
totally_skint
post Jan 8 2013, 10:23 AM

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QUOTE(C-Fu @ Jan 8 2013, 09:00 AM)
A keyboard matrix would need far less GPIO no? at least that's what I thought. and I thought a keyboard matrix would do exactly like what you suggested? as in, give a matrix output?

if I could just hack open a keyboard and somehow take out the membrane keys and connect wires+buttons to it..... should be possible kan?
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To matrix 30 keys you'd need 6 X 5 (11GPIOs).
That's plenty of buttons, wires (unless you make a PCB) and plenty of diodes to prevent "phantom" keys.
Plenty of drilling too.

For keyboard hack you'd still need plenty of wires and 30 buttons.
Advantage is minimal coding.

For jukebox type selector you just need 11 GPIOs, 11 wires and 11 buttons.
Coding would be simpler than for matrix.

totally_skint
post Jan 8 2013, 05:46 PM

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QUOTE(C-Fu @ Jan 8 2013, 11:48 AM)
just need to figure out how to replace the membrane keys on the keyboard with long wires and switches, if that's even possible (i'm sure it is, just don't quite understand how membrane key works that's all).
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Skip the membrane keyboard part and wire directly into the chip.
You just need to figure how the keyboard actually is wired to the chip.
totally_skint
post Jan 10 2013, 11:03 AM

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Almost 1 million Pis sold since February 2012 > Link

(how do you spell the plural of Pi? Pis?)
totally_skint
post Jan 10 2013, 02:32 PM

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Odd how Lowyat Forums are more active during the work-week. blink.gif
totally_skint
post Jan 13 2013, 09:11 PM

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QUOTE(satz @ Jan 10 2013, 03:43 PM)
i am not sure about the others, but vztech 7 port one worked just nice for me.
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Is this a powered hub?

Do they sell this model without the adapter?
I got enough adapters in my junk box. tongue.gif
Would there be any internal difference between the two products (if available that is)

I have seen other brand powered hubs (you can see the power socket) sold without the adapter but wondered if they also removed board components too.
Actually I'm not even sure the power socket is inside the hole. rolleyes.gif
totally_skint
post Jan 17 2013, 11:19 AM

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QUOTE(satz @ Jan 13 2013, 09:24 PM)
Yeah, its a powered hub, i dont remmember the power rating, plug sudah hilang.. smile.gif
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I just bought the VZTech 7 port hub. Comes with 1A power adapter.
What is the purpose of the switch on the side?

QUOTE(totally_skint @ Dec 30 2012, 09:04 AM)
How do I get RaspBMC to output video via composite?
Old CRT TV shows no signal.
*
Bad cable! doh.gif
totally_skint
post Jan 17 2013, 01:20 PM

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QUOTE(Fubar20 @ Jan 17 2013, 11:26 AM)
Switch on or off the powered hub.
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It switches off completely not just power as I had assumed.
Will this VZTech hub still work if I cut off the 5V line from the USB cable to prevent back feed?

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