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2008-03-21 by James Wagner
Shervin - Yes, you probably could, but the 555 only represents a small part of what would go into a switch-mode power supply. Further, the 555 is really designed to vary its duty cycle or pulse width based on external resistors and not voltages. This makes it harder to use for th
2008-03-21 by Dennis Clark
Maybe I've lost the spirit of discovery, but I see no reason to design a new power supply when there are dedicated switching controllers out there for a song (low cost). Is there a reason you want to do this the hard way? DLC > hi friends > have u ever worked at any switching cir
2008-03-21 by bronzefury
Hi, I haven't seen a good website that teaches how to write C for the AVR and would like to get some opinion from the group about which book you'd recommend. Sometimes, ratings on Amazon are a bit skewed. I'd prefer to stick with AVR Studio and WinAVR. I already have the Kernigha
2008-03-21 by LEON HELLER
M F wrote: hi friends have u ever worked at any switching circuits? i want to design a DC power supply.may i use 555 Ic's?? is there any sites to help me.your ideas could help me. let me know if u have designed a switching power supply I have, I used an AT90S2313. Leon [Non-text
2008-03-21 by Zack Widup
I've designed quite a few. What are your power requirements? What voltages in and out? What maximum current out? There are far better ways to do it than with a 555. But that will work if you only need small currents. Zack On Wed, 19 Mar 2008, M F wrote: > hi friends > have u ever
2008-03-21 by M F
Note: forwarded message attached. ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ [Non-text portions of t
2008-03-21 by Steven Hodge
Thanks for the tip. I'll give them a try. Steve From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Roy E. Burrage Sent: Wednesday, March 19, 2008 3:43 PM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] Re: switch ratings Try these ones Steven: http
2008-03-20 by John Samperi
At 03:56 PM 20/03/2008, you wrote: >5 pins? Doesn't JTAG only use four I/O pins, plus VCC, GND and RESET? >Isn't that correct? Steve Spot on. :-) Actually reset is not really needed UNLESS you plan to disable JTAG in code for, then it is needed to regain control of the chip. I us
2008-03-20 by Steven Hodge
5 pins? Doesn't JTAG only use four I/O pins, plus VCC, GND and RESET? Isn't that correct? Steve From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of J C Sent: Wednesday, March 19, 2008 9:25 PM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] JTAG Than
2008-03-20 by J C
Thanks for the input. And I guess 5 pins isn't such a bad trade off. --------------------------------- Never miss a thing. Make Yahoo your homepage. [Non-text portions of this message have been removed]
2008-03-20 by David Kelly
On Mar 19, 2008, at 5:52 PM, Benny Smith wrote: [...] > The documentation of these functions is scant, and limited to just > what is > in the Help file. The i2c Help file mentions nothing about data > direction > nor does it say anything about initialization of the AVR. Thats why
2008-03-20 by David Kelly
On Mar 19, 2008, at 7:41 PM, Paul Sinclair wrote: > There are some other tools, like avr notepad and a few things (dont > have > them here, its pc only, and im on my mac at the minute) but i cant > quite > remember. There are a number of users of avr-gcc on MacOS X, that also use
2008-03-20 by David Kelly
On Mar 19, 2008, at 6:41 PM, Graham Davies wrote: > Even if you have to move to a smaller chip for production > for cost reasons, for heavens sake develop on a chip with a debug > interface. > > Mind you, by starting with the absolute cheapest thing out there > you've > minimized
2008-03-20 by David Kelly
On Mar 19, 2008, at 6:28 PM, stereotyperjack wrote: > With the talk about JTAG, and I'm definantly new as you will see by > the question, but won't JTAG make those pins on the micro useless for > anything but JTAG and ICE use? Yes, but using JTAG is optional. Is easier to not use
2008-03-20 by John Samperi
At 10:28 AM 20/03/2008, you wrote: >but won't JTAG make those pins on the micro useless for >anything but JTAG and ICE use? Pretty much so during debug. Once the debug is finished (is it ever?) you can use them for things like LEDs or DIL switches as you may be able to fake these
2008-03-20 by M F
hi friends have u ever worked at any switching circuits? i want to design a DC power supply.may i use 555 Ic's?? is there any sites to help me.your ideas could help me. let me know if u have designed a switching power supply thank u have a nice spring holidays Shervin ___________
2008-03-20 by paul sinclair
no worries, I did have a programmer homebrewed on a piece of breadboard, but i thought, rather than hooking up xtals and all the rest, i would remove the variable and possible problems of my circuit design and go with a dev kit. But i overlooked the software side of things. i sup
2008-03-20 by paul sinclair
Jeepers no, it cost me 20 euro on ebay!! :P On 3/20/08, Graham Davies wrote: > > --- In AVR-Chat@yahoogroups.com , "ei5gtb" > wrote: > > > ... i recently purchased a "my avr" > > board from http://www.myavr.de/ ... > > Wait a minute, I've just followed the link to the myAVR. Did
2008-03-20 by paul sinclair
Thank you for the informitave reply. I understand the debugging process now, i have used debugging in software development enviroments, just never in microprocessors, mind you, iv done very little in the microprocessors, iv always done everything with relays or transistors or wha
2008-03-20 by paul sinclair
I dont have the tools here, but the "flashing" tool is definetly only in german. There are some other tools, like avr notepad and a few things (dont have them here, its pc only, and im on my mac at the minute) but i cant quite remember. Why is this a minus for you? did you buy on
2008-03-20 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "paul sinclair" wrote: > Jeepers no, it cost me 20 euro on ebay!! :P OK, that's reasonable then. I was looking at list price. Forget my previous post. Graham.
2008-03-20 by Sander Pool
No need for a book. Read the AVR Studio documentation for JTAGICE or Dragon. Read about how to start debugging in AVR Studio, setting break points and watches etc. There are other methods to do the same thing but AVR Studio is a good place to start. Read more about JTAG and DW ca
2008-03-20 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "ei5gtb" wrote: > ... i recently purchased a "my avr" > board from http://www.myavr.de/ ... Wait a minute, I've just followed the link to the myAVR. Did this cost you $80? Can you send it back? I've succeeded so far in not "touting my own stuff",
2008-03-19 by Sander Pool
Yes and it's well worth it. Have a look at the data sheet to see how many (few) pins you loose doing JTAG and DW. Sander stereotyperjack wrote: > > With the talk about JTAG, and I'm definantly new as you will see by > the question, but won't JTAG make those pins on the micro usel
2008-03-19 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Paul Sinclair" wrote: > I'm really not familiar with the > debugging of these chips "on a > chip with a debug interface" Maybe you've used a hosted software development environment, like Visual Studio or Elipse. Working on a chip with a JTAG inte
2008-03-19 by Raymond Hurst
The way I understood it here is that the software tools only spoke german. In which case, that's a big minus for me also. Have you tried downloading the AVR tools and seeing if they work? I suspect the USB programmer is just a copy of the Atmel design. Ray Hurst Western Digital 2
2008-03-19 by Benny Smith
David, Thanks for the reply. The i2c functions in Codevision-AVR-Standard are not located in a library file, so I cannot look at them to figure out whether data direction is handled there. The i2c functions are embedded in the main CV-AVR compiler (according to the Pavel Haiduc)
2008-03-19 by Paul Sinclair
Hmm, I'm really not familiar with the debugging of these chips "on a chip with a debug interface" But I know I should go rtfm, buts its just too easy to ask. How about someone - instead of answering the question, will recommend a good book to buy. Paul, EI5GTB From: AVR-Chat@yaho
2008-03-19 by Graham Davies
--- In AVR-Chat@yahoogroups.com, Philippe Habib wrote: > I ... like the traffic light > thing ... teaching kids as > a first step ... Yeah, my thoughts exactly. Actually, sales picked up a tiny bit when I put the Traffic Lights Project in a special category "Disappointingly Unpop
2008-03-19 by Roy E. Burrage
Try these ones Steven: http://www.mouser.com/catalog/633/1598.pdf With these you can even use a less expensive, non-sealed switch so your cost will be a wash. However, compare the cost of one service call to the cost of a few seals and you may gain a whole nuther perspective on u
2008-03-19 by Graham Davies
--- In AVR-Chat@yahoogroups.com, "Philippe Habib" wrote: > ... don't worry too much about > the lack of ... debug ... use > the computer in your head ... I don't disagree with you, but I agree much more with those that advocate debuggers. Why not use your head and a debugger? The
2008-03-19 by stereotyperjack
With the talk about JTAG, and I'm definantly new as you will see by the question, but won't JTAG make those pins on the micro useless for anything but JTAG and ICE use?
2008-03-19 by Benny Smith
Indeed. I mentioned it once, but I think I got away with it. -----Original Message----- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of John Samperi Sent: Wednesday, March 19, 2008 2:35 PM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] My Avr A
2008-03-19 by Philippe Habib
Just wait 'till you have a 16 year old of your own. Then you'll know what not much money hanging around really means. Now that I've got the smart ass comment out of the way, don't worry too much about the lack of easy debug ability. A former boss used to tell us all not to rely o
2008-03-19 by Paul Sinclair
Heh, I wasn't sure what to take by your opening comment, but you saved it! Well, ill not worry too much about the debug capability. I suppose ill work on learning about the dam things first! Thanks all! Paul, EI5GTB From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com]
2008-03-19 by John Samperi
At 04:39 AM 20/03/2008, you wrote: >German flag on the left, British/US flags on the right. Download the PDF >and ......"do not mention the war". (Basil Fawlty, Hotelier etc..) Regards John Samperi ******************************************************** Ampertronics Pty. Ltd. 11
2008-03-19 by David Kelly
On Wed, Mar 19, 2008 at 11:54:07AM -0700, Benny Smith wrote: > > So far, no luck. I have followed the example shown in the CV-AVR Help > file. Using an oscilloscope, I do not see any activity at either of > the Mega128 ports that I have designated for I2C communication. Start by
2008-03-19 by Paul Sinclair
Oh, yes, there is English on it, but the actual programming software, i.e to put the program onto the avr chip, is in german. I was just wondering if other programming flashing software could be used. Debugging is nothing I have really thought abouty. The actual purpose of the de
2008-03-19 by Benny Smith
I have written a short program using the Codevision AVR C-compiler (version 1.25.8a) to communicate between an ATMega128 and an electronic compass chip using the I2C (inter-integrated-circuit) functions in Codevision. So far, no luck. I have followed the example shown in the CV-A
2008-03-19 by David Kelly
On Wed, Mar 19, 2008 at 01:29:56PM -0400, BobGardner@aol.com wrote: > I see lots of little British Union Jacks next to the tech bulletins in > the suppot section. Maybe those are in English? German flag on the left, British/US flags on the right. Download the PDF and you'll see t
2008-03-19 by BobGardner@aol.com
I see lots of little British Union Jacks next to the tech bulletins in the suppot section. Maybe those are in English? -----Original Message----- From: ei5gtb To: AVR-Chat@yahoogroups.com Sent: Wed, 19 Mar 2008 8:47 am Subject: [AVR-Chat] My Avr Hello, i recently purchased a "my
2008-03-19 by Sander Pool
I agree that JTAG capability is a must for anyone serious about programming AVRs. Used to be that Atmel JTAG was pretty costly but now that clones are available that's no longer true. The time saved using JTAG to debug is enormous. At least for mere mortals like myself who write
2008-03-19 by David Kelly
On Wed, Mar 19, 2008 at 08:22:11AM -0700, Steven Hodge wrote: > > However, I am switching over to a uC system and now want these > switches to just supply a logic signal, 3V level. After the responses > to my original post I checked the specs on the switches. The NKK have > parts
2008-03-19 by Steven Hodge
Well, once again this forum is a wealth of valuable information. You all have brought up a problem I may have at the other end of the spectrum. I have a switch panel, in use now for over 5 years, that can be exposed to the environment, ie, occasional rain or splashing (but not du
2008-03-19 by David Kelly
On Wed, Mar 19, 2008 at 12:47:38PM -0000, ei5gtb wrote: > Hello, i recently purchased a "my avr" board from http://www.myavr.de/ > But much to my disappointment the programming application was in > german. I am just a beginner, and was hoping to use this board to > educate myself
2008-03-19 by ei5gtb
Hello, i recently purchased a "my avr" board from http://www.myavr.de/ But much to my disappointment the programming application was in german. I am just a beginner, and was hoping to use this board to educate myself. Could anyone advise if this board can be used with other progr
2008-03-19 by David VanHorn
> I can see where a vibration sensor would need to have small contact > pressures in order to operate properly. I thought most vibration/shock > sensors these days are piezoelectric devices. These were gold plated rings sitting on gold plated pins, in a sealed capsule. Upping the
2008-03-19 by Philippe Habib
I really like the traffic light thing. I could see buying a few of these for teaching kids as a first step in a robotics club or something like that. On Mar 17, 2008, at 5:05 PM, Graham Davies wrote: > --- In AVR-Chat@yahoogroups.com, M F wrote: >> i am a student i am looking >>
2008-03-19 by Roy E. Burrage
No electro-mechanical switching device will do well with less than a very few micro amps, but with those really eensie weensie currents found in what's considered to be a "dry" circuit, less than 100 micro amps, the contact pressures must also be high. For dry circuit application
2008-03-19 by David VanHorn
> Silver alloys are fine for "power" applications but they're severely > limited when you get down in the mud with really low currents because > the contacts will build up an oxide or a sulfide coating. This is why > they depend on the small amount of arcing that will occur in a