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by MaK11-12
Sun Nov 12, 2017 6:50 pm
Forum: Compute Module
Topic: Schematic Design Feedback
Replies: 0
Views: 489

Schematic Design Feedback

Hi all, I'm making an open source compute module development board here: https://github.com/deltabeard/cmio . I've finished completing the third iteration of the board, but the composite video and the SD card slot do not work - my computer detects the board however when connected via USB. Since the ...
by MaK11-12
Wed Mar 29, 2017 4:32 pm
Forum: Compute Module
Topic: I2S and DPI possible simultaneously?
Replies: 3
Views: 1094

Re: I2S and DPI possible simultaneously?

Yes. A bit of devicetree hackery is required, though. For example the downstream DT for the compute module: https://github.com/raspberrypi/linux/blob/rpi-4.9.y/arch/arm/boot/dts/bcm2708-rpi-cm.dts#L34 Change the pins_i2s node definition to gpio 28-31 ALT2 instead of 18-21 ALT0 and build the kernel ...
by MaK11-12
Wed Mar 29, 2017 3:53 pm
Forum: Compute Module
Topic: I2S and DPI possible simultaneously?
Replies: 3
Views: 1094

I2S and DPI possible simultaneously?

Hi all, Regarding the Compute Module 3, is it possible to use an I2S audio codec IC such as the PCM5102 on GPIO Bank 1 instead of Bank 0? I was hoping to use all the pins of Bank 0 for 24 bit DPI functionality. Therefore, using I2S on Bank 1 would be great. I'm using the compute module datasheet her...
by MaK11-12
Wed May 27, 2015 11:18 am
Forum: Other projects
Topic: Modifying a 3.5" car display for USB power.
Replies: 453
Views: 213706

Re: Modifying a 3.5" car display for USB power.

Perhaps you could break into the line, add a transistor and use PWM to reduce the brightness? I've never used transistors before, so I'm unsure how your idea would work. Would I connect the 21.6V input and a PWM signal to the transistor, and the transistor would then output a voltage depending on t...
by MaK11-12
Wed May 27, 2015 10:58 am
Forum: Other projects
Topic: Modifying a 3.5" car display for USB power.
Replies: 453
Views: 213706

Re: Modifying a 3.5" car display for USB power.

Has anyone had any luck in changing the backlight brightness level? I found that the voltage going to the 'K' and 'A' pins (the pins going to the backlight) on my 3.5" In-car LCD was a whopping 21.6V! This was whilst powering the LCD with 5V input after modding it with the instructions found in this...
by MaK11-12
Sat Mar 28, 2015 10:06 am
Forum: Troubleshooting
Topic: RTC clock
Replies: 9
Views: 3719

Re: RTC clock

I am also having problems with the DS3231 RTC. It's the same one that OP is using. I have used two so far thinking that the first one was broken, but now I believe it is a software issue. I bought my DS3231 from http://www.ebay.co.uk/itm/291394777661?_trksid=p2059210.m2749.l2649&var=590503201102&ssP...
by MaK11-12
Tue Feb 17, 2015 3:42 pm
Forum: Beginners
Topic: Changing volume using potentiometer
Replies: 5
Views: 5741

Re: Changing volume using potentiometer

I'm surprised nobody else picked up on this: your 3rd circuit seems to show an RPi GPIO pin used as an analog input. The RPi does not have any analog circuitry, such as the ADC that you need to make this idea work. So you need to get a ADC chip or one of the many GPIO add-on boards that have them. ...
by MaK11-12
Tue Feb 17, 2015 2:24 pm
Forum: Beginners
Topic: Changing volume using potentiometer
Replies: 5
Views: 5741

Re: Changing volume using potentiometer

1. You should use all 3 contacts of a volume control pot. Put the input audio and ground across the full track and take the controlled output from the slider and ground. The impedance of the following amp should be at least several times higher than the pot's resistance. I will be connecting ground...
by MaK11-12
Tue Feb 17, 2015 10:22 am
Forum: Beginners
Topic: Changing volume using potentiometer
Replies: 5
Views: 5741

Changing volume using potentiometer

Hello all. I'm making my own portable game console using the Raspberry Pi A+. Currently, I am trying to found out how I'll be able to change the volume of the headphone output and the internal speaker that I will have installed. I would like the volume to be changed using a potentiometer rather than...
by MaK11-12
Fri Feb 06, 2015 8:13 am
Forum: Advanced users
Topic: 3.6" TFT fbtft help
Replies: 3
Views: 2593

Re: 3.6" TFT fbtft help

FBTFT won't work with this display. If you look in spi_graphical.h, it mentions MCP23017. This is a SPI to 16-bit I/O expander. They drive a parallel interfaced LCD controller entirely through SPI. It resembles spritemods circuit in function: http://spritesmods.com/?art=spitft&page=2 :snip: Thank y...
by MaK11-12
Thu Feb 05, 2015 5:41 pm
Forum: Advanced users
Topic: 3.6" TFT fbtft help
Replies: 3
Views: 2593

3.6" TFT fbtft help

Hi everyone. I have a new 3.6" LCD that I have ordered from (dun dun dun) China. There is an SD card image that I found that works with the LCD. As in, /dev/fb0 is the LCD. The problem is that omxplayer or retroarch do not work. The only way to get them to work is if there is /dev/fb0 and /dev/fb1, ...
by MaK11-12
Fri Aug 12, 2011 10:03 pm
Forum: General discussion
Topic: If you could order now..
Replies: 151
Views: 22510

Re: If you could order now..

<r>I have no doubt that dosbox will work, depending on the game. I believe if you ran windows 95 in dosbox the speed should be fine.<br/> The recommended requirements <URL url="http://support.microsoft.com/kb/138349">http://support.microsoft.com/kb/138349</URL> are : 8MB RAM, ~50mHz 486CPU. Compared...
by MaK11-12
Wed Aug 10, 2011 11:16 am
Forum: General discussion
Topic: Wifi
Replies: 7
Views: 2171

Re: Wifi

<r>Go to the Ubuntu website and search for it there. Also look in the wifi section (<URL url="https://help.ubuntu.com/community/WifiDocs/WirelessCardsSupported"><LINK_TEXT text="https://help.ubuntu.com/community/WifiD ... sSupported">https://help.ubuntu.com/community/WifiDocs/WirelessCardsSupported<...
by MaK11-12
Wed Aug 10, 2011 11:06 am
Forum: General discussion
Topic: What have we missed?
Replies: 286
Views: 44898

Re: What have we missed?

<r>Quote from obarthelemy on August 10, 2011, 01:24<br/> I'm looking at the R.pi for home use as a barebones NAS/Torrent server, upstaging the NS K330 (<URL url="http://www.dealextreme.com/p/s.....rver-26320">http://www.dealextreme.com/p/s.....rver-26320</URL>). My wishes would be:<br/> <br/> --SNIP...
by MaK11-12
Tue Aug 09, 2011 7:50 pm
Forum: General discussion
Topic: What have we missed?
Replies: 286
Views: 44898

Re: What have we missed?

Can't it be have WLAN instead of LAN?
Also, documentation on installing / upgrading other linuxes like ubuntu 11.04, android and chromium.
=D
by MaK11-12
Tue Aug 09, 2011 7:37 pm
Forum: General discussion
Topic: How would you use a Raspberry Pi device?
Replies: 514
Views: 195309

Re: How would you use a Raspberry Pi device?

<t>- XMBC for media<br/> - Libreoffice for office (if arm compatible, otherwise openoffice, or alternative)<br/> - Dosbox for dos games and windows 95 emulation (for fun of course! Windows 95 on HD TV!)<br/> - I'm debating browser used, but Opera uses much less resources.<br/> - Snes9x and FCEUX to ...
by MaK11-12
Tue Aug 09, 2011 7:30 pm
Forum: General discussion
Topic: What DOS games can it run?
Replies: 39
Views: 10534

Re: What DOS games can it run?

Windows games can run under wine. Which is experimental and slightly CPU demanding.

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