Good evening ladies and gentlemen.
Im new to arduino And programing but am happy to get stuck into anything.
I'm after some advice on the best way to go with this project.
My car is a seat ibiza. It already has hvac controls with a lcd display. And is mostly an electrical system.
this system is made up of the.
Main board.
Display board .
Tape deck control baord
Hvac control board.
The main hvac buttons are electrical and work of 0v To 5v and. I have already found a pdf file which tells me each buttons voltage.
Fan speed up.
Fan speed down.
AC.
Recirculate.
AUTO.
Temp up.
Temp down.
Then flap potion is done by a manual dial which sits in the middle.
But after a lot of research online the manual dial is part of a hvac control module j255 and the main circuit board joins to this module. By two wires. Not can bus as there not twisted. And from there the j255 joins all the sensors and components toghter.
As I say I'm very new to this type of thing but have been doing lots of research. here is what I have found out so far the main chip on the main board. Is as follows (note of information I think I have found so far.)
M30612MAA 232FP
ROM SIZE (BYTE) 96K
RAM capacity 4k byte
main chip M16C/61 package 100P6S-A
SERIAL I/O UART0 UART1 UART3
Klima txd =out pin 30 (p70/txd2/TAoOut)
Kilma rx =in pin 29 (p71/rxd/TAoIn)
These are the two wires I belive come out of the back of the main board and connect down to the j255 control module. on the pdf these wires are in a multi pin connector and labeld Kilma bus in. Klima bus out.
8-bit I/O port P7 equivalent to P6 ( P70 and P71 are N channel open-drain output.) UART2 I/O
Kilma-ENA PIN 77 (p13/D11) 0-5v
8-bit I/O port P1 When set as separate bus these input and output data (D8-15)
Kombi rxd pin 32 (p66/RXD1)
I belive this joins to the lcd display to show all the hvac data etc. This is also in the same multipin connector pin and shown as kombi in. But don't think this joins down to the j255 module.
DIAG-TXD pin 35 (P63/TXDo)
DIAG-RXD pin 36 (P62/RXDo)
8-bit I/O port P6 also functions as UART0 and UART1
Pin 97 p100/ANO s1
I think this is the A-D converter for the hvac buttons.
8-bit I/O P10 equivalent to P6 also pins function A-D converter input pins.
My main aim is to get rid of all the boards have a arduio hooked up to the original hvac buttons board. And then send the right commands to control the hvac. I would then like to display the hvac data onto a android tablet.
Or a new lcd display or the old one. if I had two.
sorry again for the very noob kinda thread.
If I could find out the right data on these main two wires would I be on the right kinda track?
Thanks for any information or ideas on the best way to tackle this project.