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2004-11-09 by Dave VanHorn
In the alarm industry, this is called a supervised circuit. A resistor at the far end sets the loop current. At the panel, a window comparator checks that against high and low limits. shorted loop alarms high, open loop alarms low, short to ground or panel power also alarms. Desi
2004-11-09 by Jim Wagner
A pulse won't help you. Vibrated open or short situations will still be an open or short circuit. I suggest that you use a steady-state voltage as I suggested in my earlier post, then digitally filter. That will do a LOT more for you than pulsing. Jim On Tue, 09 Nov 2004 15:21:18
2004-11-09 by Jim Wagner
Dave - I don't see your reason for using pulses. Why not just a soft pull up at one end (say, the receiving end), a hard pull down at the other. Then, if any switch opens, the pull-up end goes high and you have it. Jim On Tue, 09 Nov 2004 14:42:23 -0000 "Dave Mucha" wrote: > > Hi
2004-11-09 by slaw999
Dave, Sounds like a failsafe design is required. Most failsafe implementations require switches that have both a Normally Open and Normally Closed contacts. This would require 2 conductors, wired in series, to each switch. Depending on the type of switch, the contacts are either
2004-11-09 by Dave VanHorn
At 09:42 AM 11/9/2004, Dave Mucha wrote: >Hi all, > >I am looking an alarm type switch and am thinking of using a Tiny11 >to generate a pulse of something like 10khz and then send that thru >the 6 to 10 switches (in series) and then use the same Tiny11 to >detect that pulse. Any
2004-11-09 by Dave Mucha
Correct, it is a series loop. It is for a machine where the wires can be cut or vibrate open or be shorted. The current or pulse would offer a more accurate way to verify that the switches are in the circuit. Dave --- In AVR-Chat@yahoogroups.com, Dave VanHorn wrote: > At 09:42 AM
2004-11-09 by Dave Mucha
> > BTY, does anyone know if there will be another group buy ? > > I doubt if Chetan will be organising another, as he's got all he needs. Why > not organise one yourself? > > Leon If I remmeber correctly, someone went to a seminar and after the seminar, attendees were offered an
2004-11-09 by Leon Heller
----- Original Message ----- From: Dave Mucha To: AVR-Chat@yahoogroups.com Sent: Tuesday, November 09, 2004 2:42 PM Subject: [AVR-Chat] alarm switch Hi all, I am looking an alarm type switch and am thinking of using a Tiny11 to generate a pulse of something like 10khz and then se
2004-11-09 by Dave Mucha
Hi all, I am looking an alarm type switch and am thinking of using a Tiny11 to generate a pulse of something like 10khz and then send that thru the 6 to 10 switches (in series) and then use the same Tiny11 to detect that pulse. Any switch opens and the pulse is lost. An alternate
2004-11-08 by Chad Albrecht
I am selling my Flash Designs MicroICE 2000 with AVRSM3in1 and AVRDIL pods. Interested parties should see my Ebay auction: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=3851702666 Thanks!! -Chad
2004-11-07 by David Jones
>>> kholt@monitor.net 06/11/2004 7:15:52 am >>> >While skimming and deleting this thread, I have just been debugging a returned board that does seem to have a fuse/lockup problem. I cannot reach the Tiny26 through the ISP (STK500 cable); but the Tiny continues to operate it's pre
2004-11-07 by Stefan Wimmer
--- In AVR-Chat@yahoogroups.com, Ken Holt wrote: > Stefan - > Thanks for your advice - I have assumed that I will be just removing and > replacing the Tiny26, but I was starting to think what other theoretical possibilities there were. Ok, it is always good to understand WHY some
2004-11-06 by Larry Barello
The wiring for setting up the STK500 for parallel mode with a tiny26 can be found in the help section of Astudio 4.x (not 3.x!) - you will have to dig around a bit to find it. It requires a custom 10 conductor cable. What I do to recover chips that won't ISP program, is to get an
2004-11-06 by Ken Holt
Stefan - Thanks for your advice - I have assumed that I will be just removing and replacing the Tiny26, but I was starting to think what other theoretical possibilities there were. For parallel programming, my old STK500 manual doesn't even mention the Tiny26s, and I'd have to fi
2004-11-06 by John Samperi
At 12:19 AM 6/11/04 -0800, you wrote: > >hi every body >iam looking for a hardware implementation of a KVM >switch . and MPASM code for PIC16f84A that do the >function of the mouse and keyboard. You should post the question on piclist.com. Here the PIC word is not permitted, even
2004-11-06 by Ian Drennan
----- Original Message ----- From: "Larry Barello" To: Sent: Saturday, November 06, 2004 5:36 PM Subject: RE: [AVR-Chat] Fuse gotchas (was Re: STK500 starter kit) > > No AVR part is useless after programming the fuse bits. You just have to > use the appropriate programming method
2004-11-06 by Stefan Wimmer
--- In AVR-Chat@yahoogroups.com, Ken Holt wrote: > While skimming and deleting this thread, I have just been debugging a > returned > board that does seem to have a fuse/lockup problem. I cannot reach the > Tiny26 > through the ISP (STK500 cable); but the Tiny continues to operat
2004-11-06 by Larry Barello
No AVR part is useless after programming the fuse bits. You just have to use the appropriate programming method - fortunately the STK500 supports both ISP and Parallel programming. For example, program the RESET line to be an I/O pin on the tiny26 and you are REALLY HOSED, unless
2004-11-06 by Ian Drennan
> I agree that this is an issue for beginners and more attention should > be brought to it. > > Recall that I discovered that fuse gotchas are solved for AVRs with > the JTAG interface because this interface does not require the clock > to be running so you can repair any fuse mi
2004-11-06 by weston54
I need the PWM to alter the speed of two pager motors on a Mega8 Mark
2004-11-06 by ali asd
hi every body iam looking for a hardware implementation of a KVM switch . and MPASM code for PIC16f84A that do the function of the mouse and keyboard. thank you ALi Khatib __________________________________ Do you Yahoo!? Check out the new Yahoo! Front Page. www.yahoo.com
2004-11-05 by Ken Holt
While skimming and deleting this thread, I have just been debugging a returned board that does seem to have a fuse/lockup problem. I cannot reach the Tiny26 through the ISP (STK500 cable); but the Tiny continues to operate it's pre-downloaded program. I assume that the serial ena
2004-11-05 by Joel Kolstad
By the way, if you think AVR programming is 'non-robust,' I hope you never end up using CPLDs or FPGAs where 'accidentally' sending a bad bitstream can cause the part to _melt down and die_ (internally lots of outputs all get shorted together). We had a design where we accidental
2004-11-05 by Joel Kolstad
> What happens if you have a soldered an AVR part on a board and lock up > the ISP mode? - bad news. > I know people who refuse to use SMD or solder DIP AVR parts into any > board, and I must say I'm one of them. Call me paranoid, but I'm not > going to design in a non-robust ISP
2004-11-05 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "weston54" wrote: > > I need to generate PWM on PB0 and PB5 of a Mega8. Yes, I know there > are dedicated hardware PWMs on this chip, but that's not what is > required. Has anyone had experience bit-banging PWM? Do you need a true PWM where the du
2004-11-05 by Eric
Thanks everyone a real basic question and a lot of interesting answers From Eric Richards ----- Original Message ----- From: "Eric" To: Sent: Thursday, November 04, 2004 11:38 PM Subject: [AVR-Chat] STK500 starter kit Does anybody know about the Atmel AVR ® STK500 is a starter ki
2004-11-05 by weston54
I need to generate PWM on PB0 and PB5 of a Mega8. Yes, I know there are dedicated hardware PWMs on this chip, but that's not what is required. Has anyone had experience bit-banging PWM? Mark Weston
2004-11-05 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "David Jones" wrote: > ... ISP modes on other micros > like the PIC just work. No traps. Maybe the PIC, but not all micros. The ZiLOG Z8 Encore! has a far worse gotcha than the AVR because the oscillator settings are controlled by the first word o
2004-11-05 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "David Jones" wrote: > >>> dkinzer@e... 05/11/2004 2:16:14 pm >>> > >You can build an AVR910-compatible ISP programmer pretty simply using > > >either an AT90S1200 or AT90S2313 (see the URL below). Of course, you > > >need a programmer of some typ
2004-11-05 by David Jones
>>> dvanhorn@dvanhorn.org 05/11/2004 3:10:36 pm >>> >Hmm.. Well, we have a system in production with three AVRs in it, and >haven't had any problems. You haven't been unlucky enough to accidently program them incorrectly. If you like I can send you a nice file which will do just
2004-11-05 by Dave VanHorn
> >That's beside the point. It can and does happen. >What happens if you have a soldered an AVR part on a board and lock up >the ISP mode? - bad news. >I know people who refuse to use SMD or solder DIP AVR parts into any >board, and I must say I'm one of them. Call me paranoid, b
2004-11-05 by David Jones
>>> dvanhorn@dvanhorn.org 05/11/2004 2:22:25 pm >>> >Until you accidently "disable" the ISP mode which renders your chip >next to useless unless you have a parallel programmer to fix it. For >some reason people don't like to talk much about this major trap for >young players. >I
2004-11-05 by John Samperi
At 02:23 PM 5/11/04 +1100, you wrote: >Classic chicken and egg! :-> > Only a problem with evolution! :-) People who believe in creation know that the chicken was created first with the ability to lay eggs. .... of course this doesn't help with problem at hand :-) I used a free pa
2004-11-05 by John Samperi
At 03:16 AM 5/11/04 -0000, you wrote: >You can build an AVR910-compatible ISP programmer pretty simply using >either an AT90S1200 or AT90S2313 (see the URL below). Of course, you >need a programmer of some type to program the AVR used in the >programmer. > By the way I have just
2004-11-05 by David Jones
>>> dkinzer@easystreet.com 05/11/2004 2:16:14 pm >>> >You can build an AVR910-compatible ISP programmer pretty simply using >either an AT90S1200 or AT90S2313 (see the URL below). Of course, you >need a programmer of some type to program the AVR used in the >programmer. Classic ch
2004-11-05 by Dave VanHorn
> >Until you accidently "disable" the ISP mode which renders your chip >next to useless unless you have a parallel programmer to fix it. For >some reason people don't like to talk much about this major trap for >young players. I wouldn't say that so much as it just dosen't happen
2004-11-05 by Don Kinzer
--- In AVR-Chat@yahoogroups.com, "David Jones" wrote: > I have both the AVRISP and STK500, and use the AVRISP where possible > because most of my development is done with the chip on my actual > target board. You can build an AVR910-compatible ISP programmer pretty simply using e
2004-11-05 by David Jones
>>> dvanhorn@dvanhorn.org 05/11/2004 12:15:00 pm >>> >Not everyone wants to flash LEDs on a development board, and IMHO Atmel made >a mistake by pushing the STK500 as their base level programming solution. > >There's always the AVRISP. No good for Tiny-11's or anything else that
2004-11-05 by David Jones
>>> dkazar@sbcglobal.net 05/11/2004 12:03:07 pm >>> >What needed to be modified? I just got the STK500 and plan to use the Tiny26 >with it. >Dennis From memory, one of the ribbon cables had to be cut and a wire extended off onto one of the other jumper pins, plus another seperate
2004-11-05 by Dave VanHorn
> >Not everyone wants to flash LEDs on a development board, and IMHO Atmel made >a mistake by pushing the STK500 as their base level programming solution. There's always the AVRISP. No good for Tiny-11's or anything else that needs parallel programming, but otherwise, just fine.
2004-11-05 by Dennis
What needed to be modified? I just got the STK500 and plan to use the Tiny26 with it. Dennis ----- Original Message ----- From: "David Jones" To: Sent: Thursday, November 04, 2004 4:31 PM Subject: Re: [AVR-Chat] STK500 starter kit I found it difficult to use, and it needed to be
2004-11-04 by David Jones
>>> rajesh_almighty@yahoo.co.in 05/11/2004 4:03:17 am >>> >hey, i know about how to interface a 8 bit microcontroller with hdd. >u can do that by writing a device driver for ide interface . it possible well u can go through white papers of microsoft for fat16 or fat32 >driver whi
2004-11-04 by David Jones
I found it difficult to use, and it needed to be modified to support the AT-Tiny26 chip I wanted to use. This was also poorly documented and Atmel admitted the fact which they said they would fix. It is exactly what you say, a "development system", and in that respect it's not to
2004-11-04 by Stuart Whelan
Hmm, that looks interesting. Does anyone have one of these ICE-Cubes and give us a independent review? I am sure the product is great Graham, your provide good support and info to others on this list, but I always like to research as much as possible about new 'toys' I am buying.
2004-11-04 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Stuart Whelan" wrote: > Does anyone have one of > these ICE-Cubes and give > us a independent review? About a dozen are out there already, from California to Sweden. Nobody has actually reviewed it yet, though there are complimentary remarks in:
2004-11-04 by rajesh parwani
hey, i know about how to interface a 8 bit microcontroller with hdd. u can do that by writing a device driver for ide interface . it possible well u can go through white papers of microsoft for fat16 or fat32 driver which ever u desire David Jones wrote: >>> heavenly_arnold@yahoo
2004-11-04 by Graham Davies
--- In AVR-Chat@yahoogroups.com, Eric wrote: > Does anybody know about the > Atmel AVR ® STK500 ... This is the "classic" way to begin with Atmel AVR MCUs. If the $80 price tag is acceptable to you, I'd recommend it. You get serial and parallel programming capability for all the
2004-11-04 by Zack Widup
I bought one earlier this year. I'd highly recommend it. It takes a bit of learning to use it, but it's a tremendously versatile piece of equipment and well worth the money. Zack On Thu, 4 Nov 2004, Eric wrote: > Does anybody know about the Atmel AVR ® STK500 is a starter kit and
2004-11-04 by John Stiekema
Many do - be specific! Eric wrote: > Does anybody know about the Atmel AVR ® STK500 is a starter kit and > development system > > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.788 / Virus Database: 533 -
2004-11-04 by Eric
Does anybody know about the Atmel AVR ® STK500 is a starter kit and development system --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.788 / Virus Database: 533 - Release Date: 01-Nov-04