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by jimmy
Fri Aug 02, 2013 4:43 pm
Forum: C/C++
Topic: Sending data between seperate programs
Replies: 3
Views: 1206

Re: Sending data between seperate programs

A named pipe is probably the easiest way to do inter process communication, although, it does have its drawbacks. Use the Unix/Linux command to create a FIFO file, mkfifo <filename> or as an example mkfifo /tmp/myfifo. After that you can write to /tmp/myfifo (if that's the name used when you created...
by jimmy
Fri Apr 19, 2013 5:43 pm
Forum: Advanced users
Topic: RPi as Display over Ethernet
Replies: 4
Views: 1757

Re: RPi as Display over Ethernet

In my experience with VNC and Pi over the network, is that it won't provide enough bandwidth to watch movies.
by jimmy
Tue Mar 19, 2013 3:41 pm
Forum: HATs and other add-ons
Topic: Have I fried my Atmega?
Replies: 4
Views: 1955

Re: Have I fried my Atmega?

The code you wrote shouldn't 'fry' the Atmega chip, but, you might check two things:
first make sure that your jumpers on the gertboard to the Atmega chip are still correct (SPI BUS GP8 - 11), second, make sure that the 'programmer' in the Arduino IDE is set to 'Raspberry Pi GPIO.
by jimmy
Wed Feb 13, 2013 1:50 pm
Forum: C/C++
Topic: Looking for Recommendation for Learning Qt
Replies: 9
Views: 2794

Re: Looking for Recommendation for Learning Qt

You might want to also look into books/tutorials on object oriented (OO) programming. It's not really that much different in terms of writing code (vs procedural languages like Basic and Fortran), but, conceptually it is quite different. Having a little OO background might make it easier to understa...
by jimmy
Wed Jan 23, 2013 2:29 pm
Forum: General discussion
Topic: Gertboard availability in the USA
Replies: 7
Views: 1804

Re: Gertboard availability in the USA

Got my Gertboard kit from MCM Electronics a few days ago, looks like they still have some in stock (kit form). I'm working on assembling it now. At first, the surface mount components gave me some concern, as my eyesight is not what it used to be. But, once I got the hang of working with the surface...
by jimmy
Fri Jan 18, 2013 2:15 pm
Forum: General programming discussion
Topic: Possible to control 16 switches with 4-5 GPIOs?
Replies: 8
Views: 1565

Re: Possible to control 16 switches with 4-5 GPIOs?

A company called 'sparkfun' has a small board with an I2C to 16 bit parallel chip on it to do (hopefully) what you want. The Raspi has an I2C bus interface as part of the GPIO pins, that interface would connect to this board, then there are 16 general purpose inputs/outputs on the board that can be ...
by jimmy
Mon Dec 31, 2012 4:34 pm
Forum: General programming discussion
Topic: Is bare metal for me?
Replies: 2
Views: 939

Re: Is bare metal for me?

C is really a pretty easy language to learn, but, there are two areas three areas where I have seen beginners have problems. The first of these are that C has two types of references to data values, one is a direct reference to the data value itself, the other is a pointer to the data. Beginners (an...
by jimmy
Fri Mar 16, 2012 8:23 pm
Forum: Automation, sensing and robotics
Topic: Stepper Motor Project
Replies: 15
Views: 9765

Re: Stepper Motor Project

<r>You'd need to build a 'connector cable', but, there's a shield for the arduino that controls two steppers, two servos and 4 dc motors.  Note, though, that the dc motors and the steppers use the same ports, so you can do say, one stepper and two dc motors or anything in between.  You can find the ...
by jimmy
Thu Jan 26, 2012 8:06 pm
Forum: General discussion
Topic: LCD / LVDS Interface for Raspberry Pi
Replies: 81
Views: 128562

Re: LCD / LVDS Interface for Raspberry Pi

<t>The problem with this board is that its input is a parallel video interface (18/24 bits of RGB info, H Sync, V Sync, etc.), the Rpi doesn't provide this type of interface.  Maybe, though, it can be 'demuxed' from the MIPI DSI connection on the Rpi board.  Alternatively, Texas Instruments makes a ...
by jimmy
Wed Jan 04, 2012 5:56 pm
Forum: Other projects
Topic: Would this screen work?
Replies: 2
Views: 2029

Re: Would this screen work?

I have thought many times about using a digital picture frame for a display, but, I can't seem to find anyone who has done that.
by jimmy
Fri Dec 30, 2011 7:08 pm
Forum: General discussion
Topic: Will you get the A or B? Why?
Replies: 56
Views: 13144

Re: Will you get the A or B? Why?

<t>I'll probably get a B, mostly because of the increased RAM.  I'm planning on doing a graphic interface using a touch sensitive LCD screen.  I'm currently in the process of building a CNC router and have purchased a tiny-g board (Synthetos.com) to control the positioning motors.  The tiny-g connec...
by jimmy
Fri Dec 30, 2011 6:55 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3705
Views: 205094

Re: Introduce yourself!

<t>Hello, I'm Jim Noeth from Midwestern United States (St. Louis, MO metro area).  I've been involved with IT since the days of punched cards and plug boards.  I'm currently doing .NET (C#) programming for a major bank, but, have programmed in more languages than I can count on both hands, from main...

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