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by edyb
Sun Jun 28, 2015 5:18 am
Forum: Gaming
Topic: RetroPie Setup - Auto-installer/updater for RetroArch gaming
Replies: 853
Views: 489680

Re: RetroPie Setup - Auto-installer/updater for RetroArch ga

I figured out the answer to my own question. If it helps anyone... Used fdisk -l to see where the USB stick was found. It was under /dev/sda. I made directory using mkdir /mnt/sda. Then I used mount /dev/sda /mnt/sda. Then I was able to get the files copied over from /mnt/sda to the roms dir, which ...
by edyb
Sun Jun 28, 2015 1:16 am
Forum: Gaming
Topic: RetroPie Setup - Auto-installer/updater for RetroArch gaming
Replies: 853
Views: 489680

Re: RetroPie Setup - Auto-installer/updater for RetroArch ga

Hi, not sure if this was answered already but this was the first thread I found. I recently made an image of RasPicade and booted it up. I had to edit configuration to allow HDMI safe mode but that's another story. Anyways, I am trying to load Roms on the SD card and not sure the best way how. I can...
by edyb
Sun Feb 17, 2013 8:14 pm
Forum: General discussion
Topic: Raspberry Pi Blackberry App (Phone and Playbook)
Replies: 1
Views: 1493

Raspberry Pi Blackberry App (Phone and Playbook)

Hi everyone, Just a reminder. If you have a BB phone or Playbook be sure to download the FREE Raspberry Pi for Blackberry App which streams in content from: Raspberry Pi blog (this official site) Adafruit RasPi Blog Raspi.TV blog RasPi Beginners Youtube video channel The app was made with approval f...
by edyb
Fri Aug 10, 2012 5:48 am
Forum: General discussion
Topic: Raspberry Pi on Blackberry (New Free App!)
Replies: 1
Views: 4870

Raspberry Pi on Blackberry (New Free App!)

Dear Raspberry Pi Friends, I wish to announce the release of the "Raspberry Pi on Blackberry" app, now available FREE for all Blackberry phones (OS 5 through OS 7) and the Playbook tablet. Simply search through Blackberry AppWorld on your phone/tablet for "Raspberry Pi", or follow the direct link he...
by edyb
Thu Jul 19, 2012 2:28 am
Forum: General discussion
Topic: Full proof backup of SD card
Replies: 16
Views: 9859

Re: Full proof backup of SD card

Maybe I don't understand the question correctly, but couldn't we just use the same Windows utility (Win32DiskImager.exe) to backup an SD card image that we have already played around with, the same way we use this utility to write the SD card image in the first place? I usually download the OS image...
by edyb
Thu Jul 19, 2012 2:10 am
Forum: General discussion
Topic: Multiplexing, will this work?
Replies: 7
Views: 3516

Re: Multiplexing, will this work?

Check out the following breaboard setup: http://i49.tinypic.com/1zqsj1i.jpg http://i45.tinypic.com/ern6dl.jpg http://i50.tinypic.com/24v62bn.jpg It is a 3 row x 2 column array but each column has 2 LED paired in anti-direction. For example, one side of my breadboard is Y1 and other side Y2. The pair...
by edyb
Tue Jul 17, 2012 5:52 pm
Forum: General discussion
Topic: Multiplexing, will this work?
Replies: 7
Views: 3516

Re: Multiplexing, will this work?

https://projects.drogon.net/7-segment-l ... pberry-pi/ Thanks, I am going to download WiringPi and start working in C/C++ (instead of Python) as soon as the new hard-float Raspbian image is available, because I am going to be over-writing my current SD card anyways and don't want to reinstall every...
by edyb
Mon Jul 16, 2012 12:34 pm
Forum: General discussion
Topic: Multiplexing, will this work?
Replies: 7
Views: 3516

Multiplexing, will this work?

I want to try something but need help from the community to understand if it is going to work or not. Please refer to the attached schematic here: http://i48.tinypic.com/2cq1r44.jpg As you can see, I have created a multiplex 3x3 array but placed 2 LEDs in anti-parallel direction at each node. So it ...
by edyb
Sat Jul 14, 2012 2:23 pm
Forum: HATs and other add-ons
Topic: GPIO LED matrix?
Replies: 22
Views: 16417

Re: GPIO LED matrix?

Thank you, I read up on charlieplexing and multiplexing. I also was thinking of something "in between" the two that keeps wiring more simple.... not sure what you call it.... but here it goes: We know for multiplexing you can use 2n pins to control n-squared LEDs in a square grid, since it is the nu...
by edyb
Fri Jul 13, 2012 2:20 pm
Forum: General discussion
Topic: Raspberry Pi LED control with Python
Replies: 6
Views: 8352

Re: Raspberry Pi LED control with Python

Thanks for the feedback! This is the best part of Raspberry Pi, our awesome community! I think when I typed in the code I put "for" instead of "if" by mistake, you are absolutely correct. Regarding arrays/lists, I didn't know Python very well, happy for the coding help! I am used to C/C++ so maybe I...
by edyb
Fri Jul 13, 2012 5:11 am
Forum: General discussion
Topic: Raspberry Pi LED control with Python
Replies: 6
Views: 8352

Re: Raspberry Pi LED control with Python

Here is the code, in case it's not visible clearly in the video: import time import RPi.GPIO as GPIO GPIO.setmode(GPIO.BOARD) from array import * a = array('i',[7,11,12,13,15,16,18,22]) for i in range (0,8) print "setup pin", a[i] GPIO.setup(a[i],GPIO.OUT) GPIO.output(a[i],GPIO.HIGH) count = 0 delay...
by edyb
Fri Jul 13, 2012 4:56 am
Forum: General discussion
Topic: Raspberry Pi LED control with Python
Replies: 6
Views: 8352

Raspberry Pi LED control with Python

Hi folks, I just wanted to share my progress with GPIO output which I recorded on Youtube! A simple beginner project I hope everyone will try, even the "non-technical" like myself, thanks to the support from some amazing users here in the forums. I was able to get this happening and recorded the vid...
by edyb
Fri Jul 13, 2012 4:43 am
Forum: HATs and other add-ons
Topic: GPIO LED matrix?
Replies: 22
Views: 16417

Re: GPIO LED matrix?

I uploaded a video of my setup and code here:

http://youtu.be/D3CiRmh4cE8
by edyb
Fri Jul 13, 2012 2:11 am
Forum: HATs and other add-ons
Topic: GPIO LED matrix?
Replies: 22
Views: 16417

Re: GPIO LED matrix?

...Just a follow-up... Perhaps better to wait until the new Debian image with floating point comes out? As far as I know, there is no way I can really migrate my existing setup easily to the new image. So I assume that I will have to copy my work-files at least (source code files) but everything els...
by edyb
Thu Jul 12, 2012 11:53 pm
Forum: HATs and other add-ons
Topic: GPIO LED matrix?
Replies: 22
Views: 16417

Re: GPIO LED matrix?

Ha! I am using 0.3.0a!!!
I was scratching my head and so thanks, at least I know I am not crazy!

I will upgrade. Maybe a stupid question, how do I upgrade? Download, unzip and untar, then install?

Will it just over-write the old library? Or do I need to remove something first?

Thanks!
by edyb
Thu Jul 12, 2012 9:35 pm
Forum: HATs and other add-ons
Topic: GPIO LED matrix?
Replies: 22
Views: 16417

Re: GPIO LED matrix?

I am having some trouble with the Python program controlling LEDs... It seems to be working backwards. My program is supposed to turn on each LED high in a row of 8 LED (each on a different GPIO) and the turn on sequence has a sleep delay of half second between each turn on... So I should she each L...
by edyb
Wed Jul 11, 2012 3:08 am
Forum: HATs and other add-ons
Topic: gertboard accessibility
Replies: 16
Views: 6690

Re: gertboard accessibility

Thanks to the help from folks on the forum, TheMagPi and other online links I managed to get the simple GPIO access through Python. I've posted it on my blog here: http://doctorbraun.blogspot.com What I was wondering was how to implement the same thing in C. I am more familiar with C/C++ and Java. I...
by edyb
Fri Jul 06, 2012 9:16 pm
Forum: HATs and other add-ons
Topic: Isolating GPIOs and using alternate power source
Replies: 20
Views: 13175

Re: Isolating GPIOs and using alternate power source

Just saw this is similar to the thread I started regarding isolation of GPIO pins. I was thinking of using the 3.3v or 5v pin on the RasPi to drive my LEDs, or possibly another power supply with higher voltage. However, I need the GPIO to enable me to switch circuits on/off, and transistors seem the...
by edyb
Fri Jul 06, 2012 2:57 am
Forum: HATs and other add-ons
Topic: Protection circuitry
Replies: 6
Views: 8244

Re: Protection circuitry

I had a look at the I-V curve for Zener diodes and I see that below the reverse voltage threshold of 3.3v the current increases like an avalanche. So the voltage can never get any more but current can increase, so I guess the resistor is there to stop it from going up to high. My understanding is th...
by edyb
Thu Jul 05, 2012 10:49 pm
Forum: HATs and other add-ons
Topic: Protection circuitry
Replies: 6
Views: 8244

Re: Protection circuitry

I read the blog a bit more closely, to try to understand it... Here is what it says, and I quote: It uses a zener diode across the input. Basically this will prevent the input voltage from going any higher than 3V3 because at that voltage it breaks down and starts to conduct thus clamping the maximu...
by edyb
Thu Jul 05, 2012 10:22 pm
Forum: HATs and other add-ons
Topic: Protection circuitry
Replies: 6
Views: 8244

Protection circuitry

I just read the latest Blog entry on the site regarding creating a break-out board like a Gertboard and wanted to understand more about the Zener diode component and how exactly that is supposed to work. From my understanding of the schematics, each GPIO from the RasPi gets connected through a seria...
by edyb
Wed Jul 04, 2012 12:52 pm
Forum: HATs and other add-ons
Topic: GPIO LED matrix?
Replies: 22
Views: 16417

Re: GPIO LED matrix?

Thank you for the suggestions. So I think I am understanding that if I use another GPIO pin instead of ground for the voltage "sink" on the ground side of my LED display, then if I set it to zero it acts as a ground? And if I set to 1 it is the same voltage as the GPIO's driving the LED display so n...
by edyb
Wed Jul 04, 2012 1:43 am
Forum: HATs and other add-ons
Topic: GPIO LED matrix?
Replies: 22
Views: 16417

Re: GPIO LED matrix?

I've been looking at a few posts on Youtube about multiplexing and I thought maybe it would be possible to do so by using some transistors and flicking the LED's on really quickly in software to simulate the digital display. That works if you have the individual LEDs and can arrange them either in a...
by edyb
Tue Jul 03, 2012 8:28 pm
Forum: HATs and other add-ons
Topic: GPIO LED matrix?
Replies: 22
Views: 16417

Re: GPIO LED matrix?

A similar related problem which I thought I'd post is my desire to control a 7-element LED array. This is the product: http://www.rohm.com/products/opto_device/led_display/numeric/lbp-602ma2/ It is ROHM LBP-602MA2, which has 2 numeric digits. There is a common ground for each digit on pin 13 or 14, ...

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