lcd´s issue

Hello , I would like to request some help with the next: I have a lcd display that i take from a fax printer he is driven by one HD44780A00 microcontroler type and y would like to make a realtime information panel to aplly on my car so that he displays something like "door open,hatchback open etc ... " i looked around in the net but i didnt find any circuit that i could aplly, i know that we must have a program to programe the lcd but i think that i need too, an analogique to digital converter so that the negative signal of 12 volts on one input pin could cause the light up of the characters adressed to that event , if someone could help me on how to do this or have or create some kind of shematic that i can aplly i really would thank, i love to mess around with electronics i know how to make pcb´s and small circuits and to aplly digital gadjets in my car , but i don´t have the needeed knowledge to create that kind of circuits, thank you!

Obs : Sorry for my bad english ,but i´m portuguese and its the best i know

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This is more complicated than you think. The HD44780 expects data words that are usually sent 4 bits at a time. Without another micro controller or a rather large array of logic chips with a memory chip I don't think you can do what you want.

Best is to study the HD44780 data sheet.

Theoretically you could cook up some logic circuitry that resets and pipes data out of an EPROM everytime an event occurs.

Regards, Joerg

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A display based around the HD77480 and work-alike chips is really fairly easy to use. A good reference is the "Character LCD User's Manual" which is linked at the bottom of the page at

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Usually the hardest thing to get right the first time is the initialization sequence. There is a flow chart in the manual; follow it and you'll be OK.

You will want to control the display with a microcontroller of some kind. If you're just starting out, perhaps one of the Parallax "Basic Stamp" modules would be a good fit.

Rich Webb   Norfolk, VA
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Rich Webb

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