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 Posted: Aug 28, 2006 - 08:57 AM |
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Joined: Jul 14, 2006
Posts: 27
Location: United Kingdom
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japroach wrote:
As long as its a LDO it should be fine. Another reason is less bias current, a 7805 uses 10's of mA while a LDO is usually uA's.
and I believe the serial port can source 20mA of current.
Ah, that explains it then. If you source the the supply from the serial port, you are going to need an LDO.
Cheers. Phil. |
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"If they did that in Manchester, they'd be chinned"
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Posted: Aug 29, 2006 - 02:07 AM |
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Joined: Jul 03, 2006
Posts: 2
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I did a programmer for my atmega8 based on http://www.lancos.com/e2p/betterSTK200.gif and the programmer didnīt work. I got the "Device missing or unknow device (-24)" error.
My parallel port is ECP and I canīt figure out why this canīt work!
Maybe Iīm wrong with some capacitors.
Please somebody can give me some ideas? |
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Posted: Sep 02, 2006 - 02:41 PM |
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Joined: Nov 01, 2005
Posts: 6323
Location: Hilversum - the Netherlands
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Goredaimon, pls read back in this thread; Lancos.com copied the suggested circuit as published here, and did not look back. Some components were changed to cope with different types of parallel ports
Plons |
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Dragon broken ? Or problems with the Parallel Port Programmer ? Scroll down on my projects-page http://www.aplomb.nl/TechStuff/TechStuff.html for tips
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Posted: Sep 17, 2006 - 09:30 PM |
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Joined: Dec 30, 2005
Posts: 55
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I'm part way into designing my board to replace my STK200.
Here's a sample of my board so far. It still needs to be double checked for accuracy. |
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Posted: Sep 17, 2006 - 09:44 PM |
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Joined: Nov 01, 2005
Posts: 6323
Location: Hilversum - the Netherlands
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Pwillard, I had a quick look at the board: 33 pF should be 330 pF ( 3 times )
I'm missing 1k from Gnd to shield of the subD 25 pole connector.
Nice job.
Plons |
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Dragon broken ? Or problems with the Parallel Port Programmer ? Scroll down on my projects-page http://www.aplomb.nl/TechStuff/TechStuff.html for tips
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Posted: Jan 02, 2007 - 10:37 PM |
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Joined: Jul 03, 2006
Posts: 2
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Quote:
Goredaimon, pls read back in this thread; Lancos.com copied the suggested circuit as published here, and did not look back. Some components were changed to cope with different types of parallel ports
Plons
Plons, where I can find a great circuit for AVR ATMEGA programming? Do you know where my project lacks? |
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Posted: Jan 03, 2007 - 12:52 AM |
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Joined: Nov 01, 2005
Posts: 6323
Location: Hilversum - the Netherlands
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Quote:
Plons, where I can find a great circuit for AVR ATMEGA programming? Do you know where my project lacks?
Please be more specific
Plons |
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Dragon broken ? Or problems with the Parallel Port Programmer ? Scroll down on my projects-page http://www.aplomb.nl/TechStuff/TechStuff.html for tips
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Posted: Jan 09, 2007 - 12:14 AM |
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Joined: Nov 23, 2006
Posts: 69
Location: Slovakia, Bratislava
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Hi, I think that I have same problem as Goredaimon, and I will be very thankfull if you wrote me exactly which schematic would I to use, because I'm misoriented in it.
Thank you very much, and please excuse my bad english  |
_________________
The working of integrated circuits is based on smoke -- when smoke flow out, they stop working 
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Posted: Jan 09, 2007 - 12:56 AM |
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Joined: Nov 01, 2005
Posts: 6323
Location: Hilversum - the Netherlands
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Quote:
I will be very thankfull if you wrote me exactly which schematic
How about reading this thread first, and then ask a specific question if something is unclear.
Plons |
_________________
Dragon broken ? Or problems with the Parallel Port Programmer ? Scroll down on my projects-page http://www.aplomb.nl/TechStuff/TechStuff.html for tips
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Posted: Jan 15, 2007 - 06:24 PM |
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Joined: Nov 23, 2006
Posts: 69
Location: Slovakia, Bratislava
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Hi Plons... it's sounds easy "read this thread first"... but my english skills is not enought to understand everything about these technical problems... but I keep trying ... I decided to make version from cb951303 (posted Aug 09, 2006 - 09:52 PM) and I believe that it will be okey.
If you want, I post there my circuit board design when it will be done.
see you soon |
_________________
The working of integrated circuits is based on smoke -- when smoke flow out, they stop working
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Posted: Jan 28, 2007 - 10:55 PM |
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Joined: Jan 25, 2007
Posts: 1
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I'd like to report about successful dongle building.
Schematics is like pwillard posted Sep 17, 2006 - 10:30 PM with Plons notes posted Sep 17, 2006 - 10:44 PM.
Works fine with my laptop through 1.8 shielded cable from laptop to dongle and ~30cm cable from dongle to test board.
BIG THANKS to everyone, who helped newbies like me to build nice dongle |
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Posted: Feb 27, 2007 - 06:05 AM |
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Joined: Feb 26, 2007
Posts: 4
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i'm totally confused. i built one pppd using a 74ls245. initially it did work but now its not working. i'm a newbie and am totally confused.i'm unable debug my pppd. so i'm planning to build a new one.but here too there are lots of schematics and am not sure which to build.
any suggestions.
am using cv avr for programming and pony prog to write the program. which are the fuse bits needed to be programmed for a 4MHz crystal,using pony prog.  |
Last edited by sarvoavr on Feb 27, 2007 - 06:22 AM; edited 1 time in total
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Posted: Feb 27, 2007 - 06:08 AM |
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Joined: Feb 26, 2007
Posts: 4
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my mc is an ATmega16L.
also can anyone suggest how to connect and program a wheel encoder.
plz reply quickly.
my parallel port seems to be ok and is set at ecp. |
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Posted: Feb 27, 2007 - 12:59 PM |
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Joined: Dec 17, 2005
Posts: 1498
Location: Europe- Estonia- Tallinn
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| just build the improved_pppd_mod_march_4_2006 it works best on my computers (32 bit ones). |
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Posted: Feb 27, 2007 - 03:18 PM |
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Joined: Nov 01, 2005
Posts: 6323
Location: Hilversum - the Netherlands
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| sarvoavr wrote:
Quote:
i'm totally confused. i built one pppd using a 74ls245
And what if you use the 74HC244 like it says in the schematic ? |
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Dragon broken ? Or problems with the Parallel Port Programmer ? Scroll down on my projects-page http://www.aplomb.nl/TechStuff/TechStuff.html for tips
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Posted: Mar 04, 2007 - 03:08 PM |
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Joined: Feb 26, 2007
Posts: 4
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| i did build the even better schematic and that too isn't working. |
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Posted: Mar 04, 2007 - 03:24 PM |
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Joined: Dec 17, 2005
Posts: 1498
Location: Europe- Estonia- Tallinn
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and were you using 74HC244?
It WILL work! where did you connect the RC filters? they must be before the wires to the AVR not after; must be between AVR and 74HC244. |
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Posted: Mar 04, 2007 - 06:31 PM |
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Joined: May 13, 2004
Posts: 382
Location: north west uk
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Quote:
am using cv avr for programming and pony prog to write the program. which are the fuse bits needed to be programmed for a 4MHz crystal,using pony prog. Confused
Have you attempted to use cvavr's inbuilt programming interface which supports the stk200/300/500 lpt/serial programmers and many more ,this will give you a better picture of fuse settings etc etc.
Good Luck
Stephen |
_________________
Codevisionavr & Avrstudio 4.18
Easyavr5A-Jtagicemk1
Call me Pedantic, But not after 9.
if Milk_Brilliant
else Codevision_Avrs==Better
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Posted: Mar 18, 2007 - 03:51 PM |
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Joined: Nov 01, 2003
Posts: 679
Location: Amadora, Portugal
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Well, my cable is one of the basic ones.
As you can see, the resistors are rather high. This puts a low limit on the programming speed, but adds a lot in protection. I also dimensioned them in order to tolerate an AVR powered at levels as low as 3.3V and, in fact, I do a lot of programming of AVR's powered as low as 2.4V. All lines have resistors for protection.
My latest addition was the capacitor, which provides top reliability as already described in this thread.
The cable as it is in the schematics currently provides me total reliability, although it programs slowly (I'm using around 512bytes/s). Looking at the wave in the scope I would say it could be used up to ~200Kbit/s.
The cable is a DB25 conector and 60cm of flat ribbon-cable.
I hot-plug the cable PC all the time, but since it has big resistors and is totally passive, I guess no big problems... |
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Posted: May 01, 2007 - 01:32 PM |
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Joined: Apr 21, 2006
Posts: 2
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Hello folks,
I've also built last version of the improved PPPD (with 330 Ohm-330pF RC filter), it works great for me! For anyone interested, I am attaching the Eagle .brd file (this extension being not allowed, you'll have to rename attached file), comments are welcome since this is the first time I use Eagle. I've added an extra LED to monitor the programmer activity. The only thing missing on the board is the 1k resistor from Gnd to shield of the subD 25 pole connector.
aleks
Plons wrote:
Phil, if I understand you correctly, you built the one with the extra transistor ?!
Good to hear that it works. Thanks for letting it know.
Being a newbie, you'll encounter more newbie-problems. Don't be alarmed .... it's SOP (Standard Operating Procedure) ... it's part of the game.
Happy computing you both
Plons
(building a new programmer based on a Butterfly and Dean's ButtLoad)
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