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