Go to advanced search

by Jezmo
Tue Jun 11, 2013 6:03 am
Forum: General discussion
Topic: i kind of wonder whats going on at the pi foundation
Replies: 3
Views: 1029

Re: i kind of wonder whats going on at the pi foundation

No?
I didnt think so, oh I know, Ill just use this board where the parts fall off as an industrial control system, it will be fine.
by Jezmo
Tue Jun 11, 2013 5:26 am
Forum: General discussion
Topic: i kind of wonder whats going on at the pi foundation
Replies: 3
Views: 1029

i kind of wonder whats going on at the pi foundation

We have this little computer, 50 quid, teach kids to program, thats cool, then it gets hijacked by linux nerds who know no better than to load it with huge libraries and bloated software and wonder why its slow and people using it in the most ridiculous and dangerous places and the people who claim ...
by Jezmo
Tue Jun 11, 2013 4:49 am
Forum: General discussion
Topic: please help
Replies: 40
Views: 11028

Re: please help

OtherCrashOverride, Seems like a bit overkill. You can talk to GPIO, serial port, and network sockets without ever leaving the language he already knows: C Yes, you can do serial port. GPIO, and network sockets in C. I have done so myself a few times in the past. Of course you can do pretty much an...
by Jezmo
Mon Jun 10, 2013 4:56 pm
Forum: Other projects
Topic: Help needed to interface OV7725 camera to Raspberry pi
Replies: 5
Views: 1987

Re: Help needed to interface OV7725 camera to Raspberry pi

Its a bog standard cmos camera module, just google for suitable datasheets, you will really really struggle to do anything with it using a pi, Ive got an FPGA application which does Sobel filtering in hardware so its able to very easily handle the data bandwidth require for real time processing. Ima...
by Jezmo
Mon Jun 10, 2013 4:45 pm
Forum: General discussion
Topic: Sage Math on the Raspberry Pi
Replies: 36
Views: 12899

Re: Sage Math on the Raspberry Pi

A much nicer package which is very powerful, but free and open source is geogebra, is comes as either a stand alone application or as a HTML5 app
http://www.geogebra.org/cms/en/ I use it for work as a replacement for mathcad.
by Jezmo
Mon Jun 10, 2013 1:16 pm
Forum: General discussion
Topic: Industrial Embedded
Replies: 25
Views: 5545

Re: Industrial Embedded

In industrial systems its nothing to do with the speed of the processor, its to do with reliability, fault tolerance and fail safe design, none of which are present in a pi- which is a toy computer designed to get kids into programming, I mentioned this once before but I think I got away with it..
by Jezmo
Mon Jun 10, 2013 1:12 pm
Forum: General discussion
Topic: Industrial Embedded
Replies: 25
Views: 5545

Re: Industrial Embedded

Can the promoters of the other devices being spoken of here, kindly read the FIRST post and tell us if their devices are actually better for that sort of application? Anyone who actually knows industrial electronics? yes of course, any product that isnt actually an educational toy designed to get ki...
by Jezmo
Mon Jun 10, 2013 9:52 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: other UARTs?
Replies: 2
Views: 785

Re: other UARTs?

You could just write a software uart and bitbang the GPIO pins
by Jezmo
Mon Jun 10, 2013 9:48 am
Forum: General discussion
Topic: Adding RAM to Pi
Replies: 52
Views: 89987

Re: Adding RAM to Pi

Its all good training for writing code for embedded systems which don't have unlimited resources.Its the kind of stuff that your average CS course won't teach you
by Jezmo
Sun Jun 09, 2013 10:39 am
Forum: General discussion
Topic: please help
Replies: 40
Views: 11028

Re: please help

It boggles the mind how you can go through uni or college and expect to graduate knowing nothing and not even being prepared to find out for yourself.
You can imagine what will happen when he gets a job and hes given a real life project to work on.
by Jezmo
Sat Jun 08, 2013 8:56 am
Forum: General discussion
Topic: bulb matrix... with real bulbs
Replies: 4
Views: 1103

Re: bulb matrix... with real bulbs

I could do you a suitable design which wont end in tears if you drop me a line.
by Jezmo
Sat Jun 08, 2013 8:54 am
Forum: General discussion
Topic: bulb matrix... with real bulbs
Replies: 4
Views: 1103

Re: bulb matrix... with real bulbs

What you need as a set of opto isolators and triacs to drive the bulbs, playing with mains when you dont know what you are doing is prolly going to end in tears so try not to lick the mains cables.
by Jezmo
Fri Jun 07, 2013 6:35 pm
Forum: General discussion
Topic: Industrial Embedded
Replies: 25
Views: 5545

Re: Industrial Embedded

The problem stems from people who have no background in electronics design sucking up whatever they read about the pi and being more than a little selective in what sinks in. I woulld have thought that anyone who promotes the idea of using the pi in industrial control is open to being sued or being ...
by Jezmo
Fri Jun 07, 2013 5:55 pm
Forum: General discussion
Topic: Industrial Embedded
Replies: 25
Views: 5545

Re: Industrial Embedded

I bet Eben would agree with many of those points. The problem isn't that the Pi isn't suitable for Industrial Embedded. It wasn't intended to be. The problem is that a few (albeit vocal) people pick up on the Pi (or whatever preceded it, or indeed, will follow it), and hail it as the greatest thing...
by Jezmo
Fri Jun 07, 2013 5:40 pm
Forum: HATs and other add-ons
Topic: May I separate the ARM CPU and RAM chip sets?
Replies: 10
Views: 4018

Re: May I separate the ARM CPU and RAM chip sets?

If you need to use a development board which is real open source hardware, such that you can actually redesign it and get the parts you need then use an arduino or beaglebones, dealing with broadcomm will get you nothing more than a poke in the eye with a sharp stick unless you have several million ...
by Jezmo
Fri Jun 07, 2013 4:53 pm
Forum: Advanced users
Topic: Will 6V damage my Pi?
Replies: 36
Views: 7635

Re: Will 6V damage my Pi?

Basically the power regulation on the pi is a mess.
by Jezmo
Fri Jun 07, 2013 4:48 pm
Forum: Advanced users
Topic: Will 6V damage my Pi?
Replies: 36
Views: 7635

Re: Will 6V damage my Pi?

The real problem is that rather bizarrely the HDMI interface uses the 5 volt supply coming from the USB interface with no other regulation.This is the real reason why you dont want to run it over 5 Volts input.
by Jezmo
Fri Jun 07, 2013 4:45 pm
Forum: Advanced users
Topic: Will 6V damage my Pi?
Replies: 36
Views: 7635

Re: Will 6V damage my Pi?

yes too much Rubbish I am afraid the voltage regulator used is the LM11173v3 or its equivalent which has a maximum input voltage of 20 volts, you can supply it with upto 20 volts and it will produce 3v3 output..Because its a linear regulator supplying it with a higher voltage will cause it to dissip...
by Jezmo
Fri Jun 07, 2013 7:59 am
Forum: Advanced users
Topic: Will 6V damage my Pi?
Replies: 36
Views: 7635

Re: Will 6V damage my Pi?

Bloody hell, would it have killed them just to design the power conditioning correctly instead of all this cocking about?
by Jezmo
Thu Jun 06, 2013 7:05 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: SPI driver latency and a possible solution
Replies: 241
Views: 135472

Re: SPI driver latency and a possible solution

A very simple observation, if you want real time performance from your operating system, why the hell are you using linux?
If you used a realtime OS you would get realtime performance.
by Jezmo
Thu Jun 06, 2013 5:42 pm
Forum: Advanced users
Topic: Using the Pi in a vibration-prone, power-hostile environment
Replies: 9
Views: 3289

Re: Using the Pi in a vibration-prone, power-hostile environ

You will have enormous cross talk on all your signals, huge temperature excursions, hideous RF fields, stupendous supply voltage glitches, stunning mechanical noise and vibration to name but a few things.
by Jezmo
Thu Jun 06, 2013 5:37 pm
Forum: Advanced users
Topic: Using the Pi in a vibration-prone, power-hostile environment
Replies: 9
Views: 3289

Re: Using the Pi in a vibration-prone, power-hostile environ

The pi simply isnt designed to withstand the type of environment that you will find in automotive systems. It will crash repeatedly at random.Its an educational toy computer not a ruggedised industrial control system.
by Jezmo
Thu Jun 06, 2013 10:49 am
Forum: General discussion
Topic: sending my pi into space
Replies: 29
Views: 4685

Re: sending my pi into space

By the way how on earth do you expect to be able to get hold of anything from any American affordable weapons tech program?

I am shocked that you haven't got one, I thought everyone had one.
by Jezmo
Thu Jun 06, 2013 9:16 am
Forum: General discussion
Topic: Feature request for potential new hardware revision
Replies: 6
Views: 1139

Re: Feature request for potential new hardware revision

You probably need a brownout detector and an external watchdog such as a maxim825.
by Jezmo
Thu Jun 06, 2013 8:54 am
Forum: General discussion
Topic: sending my pi into space
Replies: 29
Views: 4685

Re: sending my pi into space

This is what annoys people who hardware design for a living, people using a toy to do real control systems.

Go to advanced search