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Comp.Arch.Embedded is a worldwide Usenet news group that is used to discuss various aspects of Embedded Systems development.
We found 724 threads matching "led"
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The most relevant threads are listed first
Re: PID autotuning - not working for heating application
Bob - 2009-11-05 17:43:00
Frank W. wrote:
> Is there a control engineering expert here?
>
> I could us a bit of help on how to implement a PID autotune function for a
> heating application (a small boiler).
>
> My current PID autotune function produces no reliable results. I use the
> relay feedback method (Å...
servo motor controller using dspic
vibz86 - 2009-11-04 08:56:00
Hi, I have to control 2 servo motors with dspic30f3011. I came across a
sample code which I have attached below. Im finding it really difficult to
understand it and customize it according to my needs. Can some one explain
to me whats the code doing (I can of course understand all the
initialization ...Re: Disabling interrupts to protect data
ChrisQ - 2009-10-30 14:35:00
David Brown wrote:
>
> This may sound like a silly question, but why don't you just use a local
> variable to hold the old interrupt status? It is rare that you would
> want to disable interrupts in one function, and restore the state in a
> different function - since you want to ke...Re: Microcontroller Recommendations for School Project: Laser Tag
larwe - 2009-10-22 11:48:00
On Oct 22, 11:36=A0am, "Not Really Me"
wrote:
> > microcontrollers/components for this project I would appreciate it
> > very much! Thanks.
>
> Look at TI MSP430. =A0Lot's of low power stuff and I think they have one =
with
> ZigBee support.
But he doesn't really want to design...LCD SERIAL - PIC16F84A
zss - 2009-10-21 06:51:00
Hi I'm new here. and I am currently doing a project on Toxic Gas Release
Alarm system using PIC.
I'm using PIC16f84a and I have used several I/O pins for LEDs, speakers &
a/d converters. and only I/O 6 pins left for LCD. (R0A,RB3-RB7). I'm using
LCD Serial port with 8 pads(www.cytron.com.my).
...Re: Digital pin used as analog pin
Arlet - 2009-10-12 07:39:00
On Oct 12, 12:18 pm, fasf wrote:
> i want use a digital pin as analog output voltage: is it possible
> linear decrease voltage (maybe with a proper 1-0 combination) as
> output without PWM?
If you need to control many output pins, e.g. for a LED matrix, "Bit
Angle Modulation" may be a...STM32, ADCs, Timing Problem
Mike Kaufmann - 2009-10-09 18:28:00
Hello Everyone,
these days I encountered a serious timing problem using the ADCs, twice.
Because of this the ADC interrupt used up all computing power, leading
to a not or *very* slow running application and, if activated, a
watchdog reset.
What happend:
The first time the error occured so...Ethernet issue on AT91SAM9260 custom board
Al Williams - 2009-10-05 14:05:00
I have a custom board using an Atmel 9260 with a Micrel KZ8041NL PHY. I've
ported U-boot & LINUX 2.6.30 to the board and it works fairly well except
one big issue - I can't get the Ethernet to work at speeds above 10BT.
Some notes on the behaviour:
1) Negotiates link speeds fine - detects ..."LOOP" routine in Assembly
Lodewicus Maas - 2009-09-23 09:09:00
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charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Hi All
Google is NOT my friend here, or maybe I'm not searching correct - gets =
gazillions of hits on exa...Re: Anyone for a cardboard PC?
Mark Borgerson - 2009-09-22 01:43:00
In article ,=20
andrews@sdf.lonestar.org says...
> On 2009-09-20, larwe wrote:
> > On Sep 20, 10:42=A0am, Grant Edwards wrote:
> >
> > > 1) It looks like a RFI problem waiting to happen.
> > > 2) A sheet-metal case is probably the most non-hazardous,
> > > =A0 =A0easily rec...Re: Atmel JTAG MKII - Difference between HW Rev A and B (PDI Programming)
Ulf Samuelsson - 2009-09-21 18:19:00
Frank-Christian Krügel skrev:
> Hi.
>
> The programming interface changed from ISP to PDI on XMega controllers.
> The JTAG MKII can program and debug the XMegas via PDI with a software
> update, but only the newer hardware revisions seem to have the required
> hardware support.
>
...Re: Software architecture using C for mid-range PIC.
Joe Chisolm - 2009-09-13 01:26:00
On Sat, 12 Sep 2009 22:26:57 +0000, Fevric J. Glandules wrote:
> Hans-Bernhard Bröker wrote:
>
> > Fevric J. Glandules wrote:
> >
> > > Let me guess - you live in a 32 bit world, right?
> >
> > Erm ... no.
>
> Apologies. I based my assumption on:
> switch((u16)buf[0] ...Using infrared leds and transistors to make a keyboard
Enrico - 2009-09-08 14:11:00
Hi,
I have to design a 5-button keyboard.
I would like to use infrared leds and transistors to make the buttons
of the keyboard. Years ago, in fact, I had a digital manometer that
had 4 buttons based on that principle.
Before starting the design I would like to see a couple of keyboards
...Re: New approach to transfer exact data By FT2232H
Galland - 2009-08-13 07:55:00
> > Paul Ham schrieb:
> > > Hi all.
> > >
> > > I really appreciate you guys to concern my past question.
> > >
> > > (In the past thread, "For exact data transfer by using FT2232H." ,
> > > I asked why the FT2232H makes data delay randomly WHILE I sent the
> > > exact data from FPG...Looking for 2-wire to 100mil header cable
larwe - 2009-08-06 21:25:00
I'm looking for a source of the type of cables you find connecting
front panel LEDs to motherboards in PCs. These are two pieces of
stranded wire running to a crimped 2-pin, 100mil female connector that
slides onto 100mil header on the PCB. About 6" wire length would be
ideal, but I can make sho...Re: BIOS vs bootloader
An Schwob in USA - 2009-07-24 00:41:00
On Jul 23, 4:48=A0am, "shani" wrote:
> Hi
> I am trying to understand the difference between a BIOS and bootloader
> from an embedded system's perspective. In particular, the system we are
> designing will have no hard disk and uses a NAND flash as a storage mediu=
m.
> The processor i...Denx Linux 2.6.19.2 and MicroSys CR825/PM827
gchauvet - 2009-07-21 10:38:00
Hi all,
I use BuildRoot and Linux 2.6.19.2 (Denx kernel) on a MicroSys CR825/
PM827 board, but Linux didn't recognize my 32M flash (4 Intel
28F640C3). I have also tried the pm82x_defconfig profile but Linux
crash after line "NFTL driver: nftlcore.c $Revision: 1.98 $,
nftlmount.c $Revision: 1....Inexpensive
larwe - 2009-07-13 15:34:00
I'm building a little toy, and need to read a hand-encoded storage
medium something like punched tape. Right now I'm looking at the
Panasonic CNB1002 reflective photosensors, which integrate an IR LED
and phototransistor in a small gull-wing SMD package. In my small
quantities they're about $0.5...Re: continued fraction program
Paul Keinanen - 2009-06-27 00:32:00
On Fri, 26 Jun 2009 20:42:36 +0100, Paul Carpenter
wrote:
>
> I thought most of the shape issues had been calculated and observed as
> far back as the 18th Century. One experiment was to measure out known
> straight line due South in the Andes, and compare lattitude with
> expected. S...Program in external SDRAM and caching
odi - 2009-06-14 14:19:00
hi,
I have a simple program for my AT91RM9200 to turn led on and off. When I
run it from internal SRAM it works ok, but when I copy it into external
SDRAM and execute from there it jumps to address 0x2000001c (FIQ vector or
is it just a coincidence?) instead of 0x2000003c (start code is there).
64M...Re: How to make a laptop start up when ext power is applied?
larwe - 2009-06-13 09:43:00
On Jun 13, 8:40=A0am, "Shenan Stanley" wrote:
> Peter wrote:
> > I need to make a laptop start up when external power is applied,
> > without having to press the power button.
>
> If the system has a BIOS setting that controls the power settings - it ca=
n
> be done. =A0If it does ...Re: Thoughts on uC input protection for automotive/marine enviroment wanted
petrus bitbyter - 2009-06-13 07:39:00
"IanM" schreef in bericht
news:h0tbkc$rkr$1@energise.enta.net...
> I have a one off hobby project which involves taking a possibly irregular
> pulse train from a switch, debouncing it and generating a pulse train at a
> different frequency so than for any run,
>
> N*count_in-M*count_...Re: Problems with programming AT91RM9200
odi - 2009-06-12 03:08:00
hi,
Problem is solved. I tried using hyperterminal in Windows instead of
minicom and data was successfuly sent from PC - dataflash was programmed
correctly (now I use cutecom in Linux).
I was told that the fault was probably due to JTAG and openocd. Processor
must have went to some specific state ...Re: Intels chips in early days...Quire interesting...
Mike Silva - 2009-05-30 10:53:00
On May 28, 5:14=A0am, ssubbarayan wrote:
> Hi all,
> Just was going through this video from Howstuff works and I got amazed
> by the invention of the Intel4004 in the companies earlier days way
> back in 1969.Quite a remarkable work I believe.Share your thoughts....
>
> http://videos....Re: Background noise
Stefan Arentz - 2009-05-25 21:13:00
Peter Keller writes:
> David Brown wrote:
> > And if you don't want to use FTDI devices (though I recommend them),
> > there is libusb - no need to write the 10,000 lines yourself.
>
> Do you mean libusb as a library on a linux machine? Or libusb as in some
> collection of C or ...Re: Constant Current Regulators ('diodes') are back
didi - 2009-05-20 08:45:00
On May 20, 9:06=A0am, -jg wrote:
> On Semi have released some low cost, constant current regulators that
> target LED drive,
> but have many more applications
>
> http://www.onsemi.com/PowerSolutions/newsItem.do?article=3D2094
>
> Starting at $0.0545/10K, these are not the usual 'ni...Re: http://www.wolframalpha.com/
Don McKenzie - 2009-05-19 15:01:00
rebel wrote:
> I gave it a couple of tries yesterday and suspect - as a work in progress - that
> it needs a LOT more work. Wanted a straight fact (numerical) answer to a
> question, and it led me off at one helluva tangent without ever getting close to
> the right subject.
>
> I hop...Re: TRIAC gate control problem
2009-05-18 14:21:00
On May 18, 5:46=A0am, dgleeson422111 wrote:
> Hello All
>
> We have a problem with the a TRIAC device we are using.
>
> We are using it to switch 230V AC mains on and Off.
>
> The gate is connected directly to the output of our Attiny processor.
> The whole cct is at mains level w...Re: Monitor Automotive Spark Plug?
Nobody - 2009-05-16 00:44:00
On Fri, 15 May 2009 18:46:36 -0500, Tim Wescott wrote:
> I agree with Mr. Stewart: do a web search on "Kettering ignition" or just
> "automotive ignition" and see if you can find some numbers. Looking to
> see if anyone has a timing light project may be a good deal, too.
Hmm; the first...Re: Bios commands and usb
mmmm - 2009-05-08 02:37:00
Going farther in this topic how it is with caps lock on and off before
system starts. When i turn the caps lock or other lock keys, pc sends
message to keyboard and the led turns. what is responsible for sending this
message? how it exectly works?
...Re: What does an embedded beginner need to know?
Vladimir Vassilevsky - 2009-04-21 21:09:00
Mike Silva wrote:
> I've been asked to write a tutorial to introduce people who have had a
> bit of programming experience to embedded hardware and software. I
> can think of plenty of material for such a tutorial, but I don't want
> to miss something important, or treat my particular b...Re: Need guidance,where to start C programming
minita - 2009-04-03 14:36:00
> On Thu, 02 Apr 2009 16:53:13 -0500, "minita"
> wrote:
>
> > > On Wed, 25 Mar 2009 19:02:23 -0500, "minita"
> > > wrote:
> > >
> > > > I've done C programming for 3 years using Keil - professional
version.
> > Now
> > > > for last 3 years i haven't done any programming and now wanna...Re: MPLAB ICD 2 usage
Jon Kirwan - 2009-04-02 01:02:00
On Wed, 01 Apr 2009 23:32:47 -0500, "kiran_hk"
wrote:
> > On Wed, 01 Apr 2009 01:06:59 -0500, "kiran_hk"
> > wrote:
> >
> > > I have downloaded MPLAB IDE v8.30 and installed it.
> > > I wanted to communicate PIC18F452 and PC
> > > I am using a sensor for my project which gives analog...Re: W65C02S, Z80, 80C31 or other legacy processor?
2009-03-25 13:02:00
On Mar 25, 12:48=A0pm, Vladimir Vassilevsky
wrote:
>
> Obviously you want a fully static design so you can step it cycle by
> cycle and/or insruction by instruction. Also, it would probably be
Yes, that's true...
> to have tons of legacy software, such as debuggers, monitors,
> ...Re: National Semi lays off Bob Pease
Ben Bradley - 2009-03-20 01:48:00
On Thu, 19 Mar 2009 13:57:54 -0500, David Kelly
wrote:
> Tim Wescott wrote:
> > On Wed, 18 Mar 2009 14:51:38 -0700, Jim Stewart wrote:
> >
> > > They are either broke or desperate beyond measure...
> > >
> > > http://electronicdesign.com/Articles/Index.cfm?ArticleID=20847&bypass=1
...Re: Zero operand CPUs
David Brown - 2009-03-17 11:22:00
rickman wrote:
> On Mar 17, 9:58 am, "Antti.Luk...@googlemail.com"
> wrote:
> > On Mar 17, 3:24 pm, Jacko wrote:
> >
> >
> >
> > > Hi
> > > Three cheers for Chuck Moore, and his hidden friend Keep Less ;-)
> > > Another zero operand CPUhttp://nibz.googlecode.com
> > > cheer...Re: handling interrupts
tripura - 2009-03-13 16:28:00
I am also working on the interrupt handling using Microcontroller
ATMEGA2560.I want to read the switches input which are connected to the
PORTD of the MCU and on a particular switch press, a pattern of LED's had
to glow.Can anyone help me with this.
My C program is:
#define PORTD (*(volatile uns...Re: Embedded Basic interpreter recommendations?
Jon Kirwan - 2009-03-11 03:12:00
On Tue, 10 Mar 2009 20:15:49 +0100, Frank Buss
wrote:
> Jon Kirwan wrote:
>
> > It is VERY easy to teach. Not only from my own experience working
> > with literally hundreds and hundreds of users (as a tutor, then as a
> > teacher of classes, and as support staff with a timesharing s...Re: embedded tools
Simon Clubley - 2009-02-21 11:47:00
On 2009-02-21, 7 wrote:
> ashu wrote:
>
> > Perhaps this is a very naive question, but still, what are tools that
> > you use for embedded development and debug which make life
> > ( development and debug ) easy ?
>
> printf
>
> #define
>
True. And for when you can't use pr...Power Supply Question
syr123 - 2009-02-19 19:52:00
Perhaps someone with more electronics experience than myself can give me an
idea of roughly what sort of power supply I need for the following
scenario:
I am looking to power:
11 PIC16F690 microcontrollers which run on +5V
1 cold cathode light which runs on +12V (these are the specs given: I...