Contents:
Introduction
During the CDC
simulator project and its operation together with a Car-PC there was
coming up the wish to have a possibility to display MP3 title information
in the car (means not only on the PC).
The FIS (german for: Driver-Information-System)
in the dashboard (DB) seems to be the right place for that, because the
radio/navigation system is already displaying information there.
The following project describes
a solution for VAG dashboards (Audi, VW, Skoda, Seat etc.) that are operated
via the so called 3-wire-bus (3LB) interface.
Newer dashboard units (with
CAN) are not supported by this interface.
Dashboard
types and "FIS Fool" support
|
Dashboard
|
supported
by
"FIS
Fool"
|
|
controlled
by 3-wire-bus
|
yes
|
|
controlled
by CAN
|
no
|
|
only with 2 line
text display (2 lines, each with 8 characters)
|
yes
|
|
with 2 line text display
and
grafic panel
|
planned
|
|
controlled
by radio
|
yes
|
|
controlled
by navigation system
|
planned
|
Features
-
Operation via serial RS232 interface
e.g. by a PC.
-
Separate control of text in line
1 and 2 of the FIS is possible.
-
Static text display (only first
8 characters) configurable.
-
Scrolling text display (up to
30 characters scrolling from right to left) configurable.
-
Suport of dashboards that are
coded for use with radio or navigation system.
-
Control of the grafical area of
the FIS.
Display
Examples
|
Display
with two static lines
|
Picture
(51kb)
|
|
Display
with one static and one scrolling line
|
MPEG
Video
(190kb)
|
|
Display
with two scrolling lines
|
MPEG
Video
(130kb)
|
Hardware
and connection
HW documentation (Schematics,
PCB data, part lists) are available in the download
area.
Basically the connection is
done as follows:
-
Power Supply:
-
The ground points of all components
(dashboard, radio, power supply, "FIS-Fool" board) must be connected together.
-
The 12V power (ca. 100mA) should
be taken from a point in the car, that is switched on and off by ignition
(e.g. Clamp 15 or if available S-contact of the radio etc.).
-
Dashboard / Radio:
-
The 3LB interface lines (ENA,
CLOCK, DATA) must be connected to the according pins at J1 of the "FIS-Fool"
board.
-
Control:
-
"FIS-Fool" is controlled via a
serial RS232 interface on J2 (protocol see technical details below).
Switching the 3LB signals (that
are passed to the DB) from the radio or from "FIS-Fool" is done by the
SW.
Therefore the board contains
two relays:
-
Relay not actuated (opening
contact is closed - idle position)
-> 3LB signals from the radio are passed to the DB:
-
"FIS-Fool" is off (not powered)
-
FIS simulation was stopped via
the serial interface
-
Relay actuated (closing
contact is closed - activated position)
-> 3LB signals from "FIS-Fool" are passed to the DB:
-
"FIS-Fool" is on and any FIS update
mode was selected via the serial interface
Technical details:
