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SIEMENS VDO N 02 012 195 HOW TO
SIEMENS VDO N 02 012 195 SERIAL
SIEMENS VDO N 02 012 195 SOFTWARE

(did you know the gauge was double glazed?)

Safely remove the clear plastic “glass” from the unit and keep the rubber seals.

The front panel may come away at this point, if not, push firmly on the metal connectors where the plug attached to, the front should now push out.

On a clean workbench (where you are not going to lose the screws!) remove the 3 T10 torx screws from the back of the unit.

Remove the gauge from your boats engine panel and remove the connector from the back (this is a tight fit and may need to be levered out).

If you now power up the Arduino (using USB cable supplied) the display should clear, a "VDO" logo will be shown followed by "88888888" - if you have got this far, everything is working as expected.

Connect the GND (ground 0v) to the Arduino pin marked 0V.

Connect the VCC (+5v) to the Arduino pin marked VIN.

Connect the SDA (data) to the Arduino pin marked D6.

Connect the SCL (clock) to the Arduino pin marked D7.The display has 4 connections - VCC GND SCL SDA Also use thin stranded flexible wire so you can bend and twist it as needed. Make sure you leave these wires long enough to give yourself working room 15-20cm long is great. To make the display fit inside the case, I had to remove the presoldered header pins and replace them with 4 wires. Next, you will need to connect the display to the Arduino. The source code is available from me, send me a message on the forum with your email address and I’ll sent it to you.

SIEMENS VDO N 02 012 195 SOFTWARE

Start by programming the Arduino (ATMEGA328) using the Arduino software - there are hundreds of websites devoted to this topic so I won’t repeat them here. Other websites/sources can provide similar products, just ensure the display is the same - and uses the I 2C communications protocol - not SPI.

Compatible Nano V3.0 - ATmega328 Mini USB Controller Board + Cable For Arduino.

SIEMENS VDO N 02 012 195 SERIAL

White 0.96" I2C IIC Serial 128X64 OLED LCD LED Display Module For Arduino.

The actual parts I brought and used for this project were… These parts are readily available for home hobbyist use.

So, this project uses a tiny computer (AtMega328) and an organic LED screen.

I spent many hours decoding the old signals and determining what they mean, the result is the knowledge to be able to build an adapter and understand the original LCD protocols.įor those that are interested, the original LCD appears to use a chip similar to PCF8562 ( ) The next problem is that modern displays “talk” differently, so an adapter is needed to convert the old signals into new. Unfortunately, VDO’s original display (LPH3930-2) is custom made for them, and can’t be purchased, so rather than trying to repair the original LCD display, I’ve chosen to replace it with a modern alternative. The fault is due to a ribbon cable attached to the LCD display using a process known as chip on glass - practically impossible to repair without specialist tools/knowledge.

These gauges have a tendency (fault!) to intermittently display the hour counter, eventually the display is permanently blank.

SIEMENS VDO N 02 012 195 HOW TO

Useful instructions on how to calibrate the gauge (once its working!) My tach is a 0-4000rpm, with digital hour counter and inductive pickup from alternator. My tachometer is marked with the following model numbers, so this guide may work on other models of similar vintage (2004). As promised, heres a description of how to repair the hour counter on a VDO tachometer gauge (also used on Volvo Penta)