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From: <ne...@gm...> - 2003-12-27 18:19:02
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Hi can anyone tell me how to turn my backlight on with using lcd4linux?? I have got Suse 9.0 and a HD447.. Display I get Screens on the Display but the Backlight is off?? Please help me Thx a lot Stefan |
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From: Thomas S. <th...@gm...> - 2003-12-28 08:35:24
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Stefan, ne...@gm... schrieb: | Hi can anyone tell me how to turn my backlight on with using lcd4linux?? | | I have got Suse 9.0 and a HD447.. Display I get Screens on the Display | but the Backlight is off?? This is a hardware issue and has nothing to do with the software. The backlight is a simple lamp which can be connected over a little resistor to +5V. On most HD44780 display modules this can be achieved by connecting Pin 16 to GROUND and PIN 15 to the slider of a 100 ohm potentiometer. The other end (does not matter which of both Pins) of the resistor goes to +5V, the third end stays unconnected. After this you should have the backlight which can be changed in its intensity by adjusting the slider of the potentiometer. But: Please make sure that you have a *real* HD44780 compatible module first. If not you may destroy your module because I am refering to real HD44780 compatible Pinouts only. If the above method dos not work then it might be possible that your backlight lamp has become defective. | | Please help me Thx a lot | | | | Stefan | CU, Thomas. - -- thomas siedentopf - public key available. This is Linux Country. On a clear silent night, you can hear Windows reboot. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQE/7pZtdERBopHyS4MRAlueAJ9nNKMhTEBF2EhBAPNEypLIH9JYlwCg4rRB zW3A4ZATi5jVWNF40avm8qw= =UcR0 -----END PGP SIGNATURE----- |
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From: nef17 <ne...@gm...> - 2003-12-29 12:57:53
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HI thx for your answer. My LCD runs under WinXP with jaLCD really good. backlight is on. But if i use lcd4linux i can make screens but the backlight can't be turned on. My lcd is connected like this : http://www.jalcds.de/ images/4x20backlight.gif Display HD44780 Port 0x378 Size 20x4 #Delay 503 Bits 8 Wire.RW AUTOFD Wire.RS INIT MY QUESTION: How can i turn my Backlight On??? Thx a lot Stefan Am Sonntag, 28. Dezember 2003 09:38 schrieb Thomas Siedentopf: > Hi Stefan, > > ne...@gm... schrieb: > | Hi can anyone tell me how to turn my backlight on with using lcd4linux?? > | > | I have got Suse 9.0 and a HD447.. Display I get Screens on the Display > | but the Backlight is off?? > > This is a hardware issue and has nothing to do with the software. > > The backlight is a simple lamp which can be connected over a little > resistor to +5V. On most HD44780 display modules this can be achieved by > connecting Pin 16 to GROUND and PIN 15 to the slider of a 100 ohm > potentiometer. The other end (does not matter which of both Pins) of the > resistor goes to +5V, the third end stays unconnected. > > After this you should have the backlight which can be changed in its > intensity by adjusting the slider of the potentiometer. > > But: > Please make sure that you have a *real* HD44780 compatible module first. If > not you may destroy your module because I am refering to real HD44780 > compatible Pinouts only. > > If the above method dos not work then it might be possible that your > backlight lamp has become defective. > > | Please help me Thx a lot > | > | > | > | Stefan > > CU, > Thomas. |
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From: Michael R. <re...@eu...> - 2003-12-30 12:17:58
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Hi Stefan, > My LCD runs under WinXP with jaLCD really good. backlight is on. > But if i use lcd4linux i can make screens but the backlight can't be turned > on. My lcd is connected like this : > http://www.jalcds.de/images/4x20backlight.gif I see. They control the backlight with the SELECT signal and a transistor. lcd4linux does not support this. You could hardwire your backlight so it stays on all the time. there are several possibilities: either connect the base of the transistor to +5V (including the resistor 150 ohm!!!), or shortcut collector-emiiter. bye, Michael -- Michael Reinelt Tel: +43 676 3079941 Geisslergasse 4 Fax: +43 316 692343 A-8045 Graz, Austria e-mail: re...@eu... |
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From: Michael R. <re...@eu...> - 2003-12-31 14:33:20
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Hi Stefan, >>> My LCD runs under WinXP with jaLCD really good. backlight is on. >>> But if i use lcd4linux i can make screens but the backlight can't >>> be turned on. My lcd is connected like this : >>> http://www.jalcds.de/images/4x20backlight.gif >> I see. They control the backlight with the SELECT signal and a >> transistor. >> >> lcd4linux does not support this. >> >> You could hardwire your backlight so it stays on all the time. >> there are several possibilities: either connect the base of the >> transistor to +5V (including the resistor 150 ohm!!!), or shortcut >> collector-emiiter. > Ok i connected the backlight directly it runs. Thx a lot Would be > nice if in next version i can control this port. Good Idea. I will add it to my ToDo-List. But there are so many other, more important items, so it will take its time... On the other hand, if you have some spare time, are you willing to write a patch? I will support you as much as I can. There are other display drivers which have software-controlled backlight, so sample code is available. > But can you tell me > how i can display different rows on after the other. I mean like > first a screen for CPU than after 30 sec a Screen for Ram and.... At the moment lcd4linux does not really support such "screens", but this will change. I planned to get a lot of this rework done over the christmas holidays, but unfortunately I got "SpellForce" as a christmas present. I spent about 100 hours on playing the last days :-) There are two possible workarounds: 1. the ugly one: provide more than one config file, each containing one screen. use a shellscript which rotates the config file (symlink?) every 30 seconds, and send a SIGHUP to lcd4linux so it rereads its config. 2. the not-so-ugly one: Use "virtual rows" for this. See the doc on the web page. bye, Michael -- Michael Reinelt Tel: +43 676 3079941 Geisslergasse 4 Fax: +43 316 692343 A-8045 Graz, Austria e-mail: re...@eu... |
