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by J Sanderson
Wed Aug 03, 2016 11:00 am
Forum: HATs and other add-ons
Topic: Shim physical design?
Replies: 0
Views: 393

Shim physical design?

Shims like the "PIFACE SHIM I/O SHIM" and the "PIFACE SHIM RTC" don't require soldering as the holes in the PCB for the GPIO pins are smaller and are staggered, they also are very low profile which is my reason for wanting to use a shim type design for a Pi Zero interface I'm working on, rather than...
by J Sanderson
Tue Jun 14, 2016 4:42 pm
Forum: Troubleshooting
Topic: Broadcom magic pixie dust. DVI monitors work!
Replies: 0
Views: 317

Broadcom magic pixie dust. DVI monitors work!

I wonder what magic pixie dust Broadcom used so that every DVI monitor I've tried works fine with the Pi. I've been having a lot of hassle with an OMPA5432 system who's HDMI output will rarely work at all on most DVI monitors and on the few it does display something it keeps cutting out:-( I thought...
by J Sanderson
Tue Dec 22, 2015 3:52 pm
Forum: For sale
Topic: Pi-Tops available from stock in Worthing
Replies: 0
Views: 684

Pi-Tops available from stock in Worthing

Anyone after a late present?
Just found out that my local Pi supplier cjemicros.co.uk has Pi-Top's in stock :D
by J Sanderson
Sat Apr 11, 2015 9:53 am
Forum: For sale
Topic: YouTube Workshop (Video Tutorial Series & Kit)
Replies: 4
Views: 8018

Re: YouTube Workshop (Video Tutorial Series & Kit)

Kit looks great. Though it seems all the tutorials are in docx format :-(
Wouldn't PDF be better?
by J Sanderson
Thu Feb 26, 2015 5:48 pm
Forum: Compute Module
Topic: WiFi chips
Replies: 14
Views: 3121

Re: WiFi chips

Sorry I've still not got far with this. I did manage to get a brief data sheet for one Realtek USB dongle chip that actually had a pin out but it isn't nearly enough. In addition to the standard USB pins, power and earth there are are quite a few extras whose descriptions tell me little. I realise m...
by J Sanderson
Fri Jan 09, 2015 11:55 am
Forum: Compute Module
Topic: flash process interrupted... now cant access emmc
Replies: 7
Views: 1313

Re: flash process interrupted... now cant access emmc

Showing my ignorance here but I'm confused. I though a pull request was where someone was requesting the maintainer of a distribution to include a routine (often a driver) in a distribution. Here the maintainer seems to say that made a mistake but asked someone else to request a pull of a bug fix. I...
by J Sanderson
Fri Nov 07, 2014 11:35 am
Forum: Compute Module
Topic: SDIO for Wifi/Bluetooth module
Replies: 93
Views: 43281

Re: SDIO for Wifi/Bluetooth module

"I plan to use a RT5370 embedded module which is connected via USB. You can get those for about 3$ as THT or SMT in China" Any ideas of a source of a datasheet for it? I've been trying to get one out of MediaTek for nearly a year now. I'd be interested in any single chip USB to Wifi that has support...
by J Sanderson
Tue Nov 04, 2014 1:29 pm
Forum: Compute Module
Topic: Dual cameras with UV4L
Replies: 4
Views: 3334

Re: Dual cameras with UV4L

I deduce UVl4 is a video input Linux driver but can anyone point me in the direction of a non technical overview of UV4L. Google finds me lots of technical detail but I can't find anything giving me an overview with examples of its uses etc. The documentation at http://www.linux-projects.org/modules...
by J Sanderson
Fri Oct 10, 2014 8:58 am
Forum: HATs and other add-ons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 115348

Re: Gert's VGA add-on for the B+

"but for 1bit version, you draw 9.45mA from the RGB pins." My maths (probably wrong!) gives 3.3/275=0.012 Amps per colour Surely the number of bits used doesn't affect the current draw? A white screen would be 275 Ohm cumulatively for one bit through to 8 bit? I do see though that you have to be car...
by J Sanderson
Thu Oct 09, 2014 11:49 am
Forum: HATs and other add-ons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 115348

Re: Gert's VGA add-on for the B+

If I've understood the maths and resistor choice I'm going to try: 1 Bit per pixel: use 274 Ohm resistors 2 Bits per pixel: 412 Ohm on MSB and 825 on the other = 275 Ohm n.b. I don't have any 412s at present so will try: 422 Ohm on MSB and 845 on the other = 281 Ohm Can anyone confirm if I've calcul...
by J Sanderson
Wed Oct 08, 2014 4:57 pm
Forum: HATs and other add-ons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 115348

Re: Gert's VGA add-on for the B+

Thanks Gert I look into 'tiny logic'.
by J Sanderson
Wed Oct 08, 2014 3:47 pm
Forum: HATs and other add-ons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 115348

Re: Gert's VGA add-on for the B+

Hi I'm going try and build my own. To avoid the problem of drawing more power than the Broadcom specs say you should for the HSYNC and VSYNC I was thinking of using a transistor and the 3v3 line. What value resistor would give the necessary current that the VGA specs say HSYNC and VSYNC? I've tried ...
by J Sanderson
Fri Oct 03, 2014 10:58 am
Forum: HATs and other add-ons
Topic: Gert's VGA add-on for the B+
Replies: 240
Views: 115348

Re: Gert's VGA add-on for the B+

A few questions, I suspect Gert is the only person who can answer authoritatively to some of them! 1. If you have an SD Image downloaded in the last 4 weeks is it necessary to "Copy the file dt-blob-dpi.bin to boot partition of sdcard, renaming it to dt-blob.bin"? 2. Re 3 or 4 bits per channel use (...
by J Sanderson
Wed Aug 06, 2014 4:16 pm
Forum: Troubleshooting
Topic: MODEL B+ and the ATRIX LAPDOCK
Replies: 12
Views: 3092

Re: MODEL B+ and the ATRIX LAPDOCK

i.e. will D+/D- & 0V be enough for USB to work? Yup. When people want to stop their (cheap) USB hub back-powering their (Model B) Pi, the recommendation is to always just "cut the red wire" ;) Sorry I'm confused. To run a B+ I know I need to connect 5V to the B+'s micro USB input (Connection A). Th...
by J Sanderson
Wed Aug 06, 2014 12:19 pm
Forum: Troubleshooting
Topic: MODEL B+ and the ATRIX LAPDOCK
Replies: 12
Views: 3092

Re: MODEL B+ and the ATRIX LAPDOCK

In all the blurb about the Pi B+ Model it is clearly stated that it is no longer possible to power the Pi via the USB Ports due to change in circuitry. You will need to power the Pi B+ thru the microUSB port O.k. but in addition to connecting the lapdocks 5V output (on the micro USB male) to the mi...
by J Sanderson
Thu Jul 31, 2014 9:00 am
Forum: Compute Module
Topic: WiFi chips
Replies: 14
Views: 3121

Re: WiFi chips

Is this the type of USB WiFi Module ?? http://www.aliexpress.com/item/MINI-1T1R-RT5370-Embedded-150Mbps-USB-wifi-module-with-WPS-function-Support-Android-OS/753550577.html Yes and no, but we don't want a module, we want to build the chip onto the board. The images on the Aliexpress site are very co...
by J Sanderson
Thu Jul 31, 2014 8:52 am
Forum: Compute Module
Topic: WiFi chips
Replies: 14
Views: 3121

Re: WiFi chips

RaTTuS wrote:can you post a model number of the things you have been looking at
We need to use one that has a driver included in the standard distribution, so I suspect my question should be where on github do I look to find a list of those WiFi chips that are included? Thanks for your time.
by J Sanderson
Wed Jul 30, 2014 5:40 pm
Forum: Compute Module
Topic: WiFi chips
Replies: 14
Views: 3121

Re: WiFi chips

Thanks for the link RaTTuS but that is about 10 times the price and a lot larger @ 14 mm x 21 mm than a WiFi dongle chip. Space and price is important for our product. It also is SPI which would cause other problems.
by J Sanderson
Wed Jul 30, 2014 3:57 pm
Forum: Compute Module
Topic: WiFi chips
Replies: 14
Views: 3121

WiFi chips

We want to include WiFi on the CM motherboard we are designing. i.e. include the chip that is in a WiFi Dongle. Unfortunately the biggest makers of the chips MediaTek & RealTek aren't interested in supplying us. Anyone know another manufacturer preferably with European distribution?
by J Sanderson
Sat Jun 28, 2014 12:25 pm
Forum: Other
Topic: XBMC Best Remote
Replies: 5
Views: 3198

Re: XBMC Best Remote

CEC seems probably the best but my project will not always be run on CEC compatible systems.
It would be great to know the pro's and cons for:
CEC
TSOP4838
The Adafruit option
and FLIRC.
or ? are there any other options.
by J Sanderson
Thu Jun 26, 2014 1:08 pm
Forum: Other
Topic: XBMC Best Remote
Replies: 5
Views: 3198

XBMC Best Remote

Hi I hope this is the right place for XBMC questions.

What is now considered the best method of Remote Control.
If USB which?
Infra red e.g. VISHAY TSOP4838
or?
Pro's and Cons please.

Thanks Jon
by J Sanderson
Wed Oct 03, 2012 12:02 pm
Forum: HATs and other add-ons
Topic: Adding external RTC
Replies: 10
Views: 4241

Re: Adding external RTC

The DS1307 is a 5V device and not suitable according to my reading of the datasheet: http://datasheets.maximintegrated.com/en/ds/DS1307.pdf The DS1307 has to be run at 4.5 - 5.5V and whilst the specs say Logic INPUT can be 2.2V - 5.3V the Logic OUTPUTS will be 5V which is out of spec for the BCM2835...
by J Sanderson
Thu Sep 06, 2012 12:54 pm
Forum: General discussion
Topic: Rev2 boards are here!
Replies: 103
Views: 13521

Re: Rev2 boards are here!

deleted by poster
by J Sanderson
Mon May 14, 2012 8:44 pm
Forum: Other projects
Topic: More New Yoctopuce cases for those that missed out
Replies: 14
Views: 3977

Re: More New Yoctopuce cases for those that missed out

If you're not making a significant profit at £15 then you need to change some of your suppliers!
by J Sanderson
Tue Mar 20, 2012 3:35 pm
Forum: Other projects
Topic: Cases for the Raspberry Pi
Replies: 866
Views: 395803

Re: Cases for the Raspberry Pi

<t>modmypi said: <br/> <br/> <br/> @mrlinux2u<br/> <br/> I was waiting for someone to ask for pink I'll look into it, although not that many ABS suppliers seem to stock it, and when they do, its at a horrific price.<br/> <br/> ModMyPi<br/> <br/> <br/> What about clear? I hear some 3D Printers will p...

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