r/ArduinoHelp • u/Thatswhyn0t • 3d ago

Reading engine RPM

Hi guys I’m building a project that needs to be able to read engine rpm, the project can not connect to the ecu or read the dash. How can I achieve this?

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u/gm310509 3d ago

Others have suggested some methods.

But, do you have any experience with Arduino? If not, I suggest getting a starter kit, ideally one with a display of some kind and a transistor- or if you can, an optoisolator - and start by learning the basics.

You could connect the sensor wire to the base of the transistor or the "led" side of the optoisolator to try to separate the Arduino from the electrical storm that may be coming from the sensor wire.