Talkback for article: 236, May2002

A LCD control panel for your Linux server

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From: lcdtastatur <lcdtastatur(at)> [ date: 2002-05-07 ]
the same on Parallelport with 15 keys and LCD

cheaper but without watchdog:
From: Peter Newman [ date: 2002-05-07 ]
Linuxgazette had last month a good article on parallel port and LCD:

From: M Walterfang [ date: 2002-05-15 ]
Guter Artikel zu einem sehr interessanten Gebiet. Dieses Thema stand schon länger ganz oben auf meiner "Wunschliste"!
Bei allem Lob aber auch ein Kritikpunkt:
Bei der Anleitung zum Herstellen selbstgeätzter Platinen darf ein Hinweis auf die ornungsgemäße Entsorgung der verbrauchten Ätzlösung nicht fehlen !
Der Umwelt zuliebe.

Viele Grüße und weiter so!
From: Ditto <ditto(at)> [ date: 2002-06-17 ]
i have a question ,
can i connect 2 RS232 I/O PORT through MAX232 with AT90S4433's PORT D?
i want to exchange data through AT90S4433 between 2 RS232 I/O,
can i do it with AT90S4433?
anybody know this?
if you know ,tell me how to do ,
Thank you very much !

From: hj_18 <mh_jcxx(at)> [ date: 2002-07-01 ]
请在makefile中的两句uisp命令的中间插入一句sleep 1,可以使它正常工作。
From: floris lambrechts <floris-(at)-linuxfocus-(dot)-org> [ date: 2002-11-23 ]
Guido, as usual a very nice article.
You are really making me enthousiast about all this hobby hardware stuff.
Well done!
From: hp kirchhoff <hp.kirchhoff(at)> [ date: 2003-06-22 ]
Endlich eine Lösung.Für viele Server genau das richtige.Wollte seit Jahren
so eine Minikonsole wenigstens zum shutdown bauen, hatte aber nie genug Zeit dafür.Vielleicht findet sich auch mal jemand, der eine kleines Linuxprogramm
schreibt, mit dessen Hilfe man einen Server herunterfahren kann, wenn nur eine Maus (keine Tastatur) angeschlossen ist. Eventuell mit einer Kombination wie 3x [linke Taste- rechte Taste]. mfg. hpk.
From: T. Koray Peksayar <koray(at)> [ date: 2003-09-22 ]
I have a minor problem loading the software to the AVR. The program loading works very seldom. I mean when I connect the board to the parallel port and make load the script often tells that the AVR is not found. Seldomly, it finds the AVR, tries to load the software but tells that verification can't be done.

What am I missing here ? Did I do something wrong on the board or is it a problem with usip ? I'm using the latest version of uisp by the way.

Any help is greatly appriciated.

From: STepan <stpworld(at)> [ date: 2004-08-08 ]
Sorry, but you using incorrect scheme in part, where max232 and at90s4433 connected. Usin your scheme, I have a lot of mistakes, when I try to recieve by 4433 the byte. The correct alternative of this part you can find in max232 datasheet:
... may be I am not understand the reason of this scheme ?
Respected autors, please, fix it defect.
Thank you.
Best regards.

From: Ahmet Muratoğlu <ahmetmuratoglu(at)> [ date: 2005-05-22 ]
The perfect embedded project..!
From: Randy <rreese6(at)> [ date: 2006-06-29 ]
Well I have the Unit built except I am needing to find a 20x2 LCD
I have 16x2 (too small) and I also have a couple 24x 2 LCD.
Can I use the 24x2 LCD (PC-016ATE)?

Thanks for the great article]

From: julio cesar montesquieu <chechaj(at)> [ date: 2006-07-03 ]
friend if you know a pagina algun frecuencimetro for 100 mhz that uses pics 16fxxx you prune to send me it to the email thanks

From: dan mccormick <god_tiamat(at)> [ date: 2006-11-21 ]
Thanks for the very fine article! You were careful to tell us to be sure of the power supply lines for the LCD. By using a diode, you can use it to block the power if the polarity is wrong. For example: put a diode so it is forward biased in the +5 volt line (+ on diode to + on power supply line). If someone hooks the lines wrong, the diode will NOT conduct, saving the circuits! This method does introduce a diode drop of about 0.5 to 0.7 volts, so you might want to adjust your supplies to make up the difference.
BTW... god_tiamat is my alter ego when I am gaming. I'm not a real god :)
Dan McCormick from Richmond, California USA

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