vwcdpic port for arduinos

I have a time to study vwcdpic AVR port for arduino mega which was ported by guy vti on hackaday.com forums and make changes to run it on arduino deumilanove/uno/nano. Code is on github. This is full software based, no hw SPI is used, so is easy to port. Future planes are atmega8 port, which is little diferent in speak of timers.. and attiny85 port of corse, cose I have nothing better to do :D

then headphone support emulating pushbuttons, and bluetooth...

to make it easy to test I clean/tuneup/fixed radio emulator
 

vwcdpic boards

vwcdpic boards are for sale (1Euro for board + shipping)

preprogramed pic +2E

asembled emulators + simple cable with jack or cinches (tested wvcdpic + audio cable = 10euros + shipping )

contact me on email if you are interested


 

list of materials

C10,2  - 100n,1206
R1       - 10k,  1206
R5,6,7 - 3k3,  1206
U1       - PIC12F629-I/SN, SW: VWCPIC v3, 8SOIC
U2       - AMS-1117-5.0 (5V) SOT-223

 assemble plan: 

 

 

schematics in PDF

finished emulators:

for audi concert2

audi concert1/chorus1

this version of firmware is know to work with VW RCD300 units

to make cost as low as posible, 2.54 pin socket is used:

RCD300 version

RCD300 version

how to connect this pic based emulator

breadboard adapter for blk-md-spk-b

simple breadboard adapter for cheap BLK-MD-SPK-B module from ebay based on OVC3860 with 3.5mm jack adapter, here is it in action:

 schematics/board are on my github

few pictures:

kicad library for BLK-MD-SPK-B is also on github

copy of pdf with OVC3860 AT commans used in video (AT#MD AT#ME....)

CD Changer emulator

PIC version based on vwcdpic project

 Edit: better look for this
 
UPDATE: simple boards are for sale (1Euro for board + shipping), also asembled emulators + simple cable with jack (tested wvcdpic + audio cable = 10euros + shipping ), contact me on email if you are interested, also I can send preprogramed pic +2E

originaly this was on fritzing project page. There is lot of "files" so i make it clear here, I hope:

whole project is build around www.k9spud.com/vwcdpic/ project (mirror,mirror of devel site) , which was realease under gpl (2 I thing ...)

There are 3 firmware version:
v1: for large 16pin pic ... don't care
v2:

• for pic12f629
• source code provided
• serial output, easy to handle with arduino
• has bug with serial comuniaction, selecting CD3,4,5,6 send always command 0xd3 (cd3 selected), but fix is sipple,fixed pic asm is on my github
• is buggy(don't use it!) on blaupunkt chorus1 and  concert1 not on philips concert1

v3:

• for pic12f629
• just hex
• serial output but with bug in serial communication (can't fix, no source code)
• is buggy(don't use it!) on blaupunkt chorus1 and  concert1 not on philips concert1

I don't know what's real diffrence in v2 and v3 code, except used pins.

I use buggy version 3 of fimrware only for emulating CD changer, without controling anything else and fixed version 2 to comunicate with arduino, which then I used to controling HTC phone and BT module.

When I start to search about this, I found that guys form cz skoda forum are doing this fake changer, they add power control to "switching" permament +12V ...... so I take their design and used it. After some builds, and research how to use this emulator with old audi chorus unit, I realize that BSP452 which is used to switch and provide stable 12V on ACC pin is capable of 0.7A as minimum, so I remove whole "power switch" and drive it whole directly from radio ACC pin.

Also audio amlifier is better not to be used, lot of noise etc... I try a lot of shielding, koax kables and design , and then I just give up. Best is to use simple emulator made on universal board, just like next picture, and connect audio directly to coresponding pins on radio CD changer connector. If you relly want to use regural PCB go with smd version down there and just "cut" audio part.
 

Simple version

for compiling pic asm: gpasm xxxx.asm

for burning I use http://rweather.github.io/ardpicprog/

Emulators with audio amlifier

kicad files
fritzing files

Schematics, for firmware v3

PCB is just remake of PCB which was on k9 site:

kicad version build

fritzing version

Separated audio ground filling, to try killing the noise comming from comunication PIC<->radio. but it don't fix it :(. This can be easy converted to "just emulator" version.
edit: after a while I connect audio ground with separate cable to chassis and it fix noise problem, so as always, problem was ground loop. ...

HTC support

files on gitbut, also with instruction

this use v3 of firmware, because there is just "play/pause" on headphone remote control, so bug in firmware is not problem

Bluetooth support

files on gitbut, also with instruction

problem with this BT module is in handling incoming call (or its bug in my HTC) after "pickup" it disconected from phone.

only pic I have :)

currently im doing "sniffer" for pic version,  so I can update shyd version of emulator on atmega. I do this because on chorus1 and concert1, there is som sort of bug, which some time lock radio in strance mode, when radio still send one command and do not want to recognize fake changer :)

ATMEGA version

based on SHYD work, ported to arduino (ATMEGA168,328 and also works with ATMEGA8 -1$ on ebay). Works with 16MHz Xtal and also with internal 8MHz RC oscilator (tested) - set CPU_SPEED to cpu clock value in MHz more about this in newer post

connection of arduino to HU

code on github

audi FIS 3-line protocol

UPDATE:

check libraries for reading data from radio and writing to cluster:

https://github.com/tomaskovacik/VAGFISReader
https://github.com/tomaskovacik/VAGFISWriter

Here is  wikipage with schematics:

https://github.com/tomaskovacik/VAGFISReader/wiki/How-to-connect

also page ti theory of operation:

https://github.com/tomaskovacik/VAGFISReader/wiki/Theory-of-operation

When writing to the cluster, no external components are required,the  cluster has all these components inside.


I think, this apply for pre-CAN-BUS cars only, check sticker on your radio, if there are 3pins labled ENA DATA CLK in middle section of mini-iso connector:

some 2000 models can be switched from canbus to this 3lb protocol.

 

static text

moving text

									DEC	255-DEC		ASCII	REAL
0	0	0	0	1	1	1	1		15	240			ADDR?
1	0	1	0	1	1	0	1		173	82		R
1	0	1	1	1	1	1	0		190	65		A
1	0	1	1	1	0	1	1		187	68		D
1	0	1	1	0	1	1	0		182	73		I
1	0	1	1	0	0	0	0		176	79		O
1	0	0	1	1	0	0	1		153	102		f	_
1	0	1	1	1	0	0	1		185	70		F
1	0	1	1	0	0	1	0		178	77		M
1	0	1	1	1	0	0	1		185	70		F
1	0	1	1	0	0	1	0		178	77		M
1	1	0	0	1	1	1	0		206	49		1
1	1	0	1	0	0	1	0		210	45		-
1	1	0	0	1	1	1	0		206	49		1
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	0	1	0		218				CRC
0	0	0	0	1	1	1	1		15	240			ADDR?
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	0	0	1	1	1		199	56		8
1	1	0	0	0	1	1	0		198	57		9
1	1	0	1	0	0	0	1		209	46		.
1	1	0	0	1	1	0	0		204	51		3
1	1	0	1	1	1	1	1		223	32
1	0	1	1	1	0	0	1		185	70		F
1	0	1	1	0	0	1	0		178	77		M
1	1	0	0	1	1	1	0		206	49		1
1	1	0	1	0	0	1	0		210	45		-
1	1	0	0	1	1	1	0		206	49		1
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	1	1	1	1	1		223	32
1	1	0	0	0	1	0	0		196				CRC

CRC=MODULO(SUM(255-DEC),256) = ((SUM(0xFF-HEX))&0xFF)

Starting "pulse" ?

packet

so, it's SPI!?

TODO: try to use SPI libs to hadle this. http://www.gammon.com.au/forum/?id=10892

ENABLE is bi-direction "wire":

from audi concert plus

audi concert (nav)/chorus

and here is something like "ping" to radio:

Arduino code to receive from radio and to send text to cluster is down there:

Arduino code to send data from RS232 to cluster 

Arduino code to receive data from radio

comunication betwen arduino reader and actual radio

video of code in action

How to enable CD changer input on audi chorus I

How to enable CD changer input on audi chorus I

 From schematics, difrence between chorus and concert which has CD changer input,  is just few parts and enable CD-changer by coding as in here. Parts need to be soldered on main board to enable are this:

Audio input filter:

C1407 2.2uF/10V(THT, 2.54mm)

C1427 2.2uF/10V (THT, 2.54mm)

C1424 820pF (SMD 0805)

C1404 820pF (SMD 0805)

R1401 10kΩ (SMD 0805)

R1421 10kΩ (SMD 0805)

R1402 10kΩ (SMD 0805)

R1422 10kΩ (SMD 0805)

Location of all components on bottom side of PCB.

Power supply switch:

BSP452 (cheepest on ebay)

R2018 150Ω (SMD 0805)

Location of 150Ω resistor is on first picture.

Comunication lines Data-In, Data-out, clock

R5301 1kΩ (SMD 0805)

R5304 1kΩ (SMD 0805)

R5305 1kΩ (SMD 0805)

R5202  2,2kΩ (SMD 0805)

R5303  2,2kΩ (SMD 0805)

V5301 BC848B any BC848/850 is ok

 V5302 BZX84C5V6

V5303 BZX84C5V6

V5304 BZX84C5V6

Location of 3x1k and 2x2k2 is on first picture.

Price for this components is 0.68€ at gme.sk.

After this, you need CD changer emulator and simple circute, which emulate "mode" button press. For so small project is perfect attiny25/45/85 actualy 85 is cheapest one. For attiny support in arduino, follow this tutorial. Sketch for tiny:

code

Schematic  and pcb for this "mode button emulator":

schematics

PCB

audi a4 b5 woofer + fix

If subwoofer and rear speakers not working (avant version):
While radio is ON check if ther is 12V as red marks show. If so, check if there is a short like yellow marks show, if there is no short while 12V is in place, that means, relay is not working, change it or make permanent short between yellow solder joints.