(G) MAREA steering wheel remote 2 SONY adapter finished ....

Hello to all!

I've just finished interface (adapter) based on Microchip PIC16F877 microcontroller to connect FIAT steering wheel remote control with my SONY CDX-F5700!

This is first version ov interface which is currently assembled at universal(testing) board. I'm very satisfied for now and future versions will be improved and more functions will be implemented ....

Interface should work with any SONY car-stereo devices which have SONY RM-X2S or RM-X4S joystick input.

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Resistance measures:

SONY RM-X2S & RM-X4S

0R Off
2.2k Source
4.4k Mute
6.6k List(Disp)
8.8k Seek up
12.1k Seek down
16.8k Volume up
23.6k Volume down
33.6k Select
48.6k Mode

Pinout:
RED wire signal
WHITE wire SHIFT
SHIELD siglal ground


FIAT Marea - steering wheel (measured values)

930R VOL+
0R MUTE
450R VOL-
1.8k SEEK+
7k MODE
3.2k SEEK-

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Schematics:



If anyone will be intrested about it, I will explain more details ....


Have a nice day

Nice
I'll put a direct here from the ICE section.

very thanks

No problem folks!


Maybe it looks as some "mistery" but device is very simple ..... it works as basic resistance convertor between steering wheel and SONY. In practice, it was done with A/D converter and switched output which change resistance in order to simulate SONY Joystick.

About half parts can be ommited and it can be done with any PIC microcontroler which has A/D converter ..... just with few changes in code!

In second way, it can be done with R-C constants (without A/D converter) with measuring delay between discharging and charging capacitor.


I will put ASM code on forum when I clean it ..... now is very rough becouse it is still under facelifting!


Have a nice day!