| Arne Zunker (www.zunker-online.de/)
has also build the Opel Tachometer. He designed a PCB for it. He shows
some pictures at: www.zunker-online.de/lcd/.
I have copied some of the pictures here with some comments:
First of all the final working result!!!!
Arne has designed a PCB for the tacho meter. You can download a .zip
with the files that he has send me. The ".lay" file
contained in the zip was made with "Sprint Layout 3.0" The
layout looks as follows:
The copper side (Bottom view, this picture is not to scale).
Again the copper side but now with the components placed. (Bottom
view)
Unfortunately the PCB was exposed mirrored. Therefore the PIC and the
connectors were placed on the copper side. The design as shown above
is however correct.
This picture shows the numbering of the cableconnectors seen from the
cable side of the connector. There are female connectors located at
the PCB. The connector that comes from the car is also female. The connector
of the TID is a Male connector.
The top left (Car Male) is connected to the lower left (PCB-Car
Male). Connect pin number 1 to 1, 2 to 2, etc. This cable is
actually a one to one cable. The position of the number 1 wire does
not change, although the numbering is mirrored at one connector.
The connector on the top right (LCD Female) is connected to the
connector on the lower right (PCB-LCD Male). Again connect pin 1 to 1,
2 to 2, etc. The wiring of this cable is not random but was chosen to create an easy
layout of the PCB.
In addition pins
number 2 and 4 of the connector Car-Male need to be connected to the
pins 2 and 4 of the connector LCD Female to enable the temperature
readout. This can also be done on the PCB.
The other side.
He used a programmer that connects to the serial port of the computer
in order to program the PIC16F84A. More information can be found at: www.galinsky.org/PICs/PICs_Teil_2/body_pics_teil_2.html
and www.qsl.net/dl4yhf/winpicpr.html.
I picked up the tacho signal at the bobbin. The car of Arne is a
bit newer and there is a signal available denoted by the green wire in
the red circle:
This connector is located behind the instrument panel above the
steering wheel. More information including a howto can be found at: http://www.mathijssentechnics.nl/.
Testing with the engine off.
Testing with the engine on.
The PCB was placed in the center-console as the next pictures show:
PCB below the console
It will be placed behind or below the radio.
The two thick gray wires go to the PCB
The connectors
Placing the TID
"Welcome"
Engine off
Action.
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