I'm trying to read a oil pressure switch (I'm actually not sure about the sensor type) from my motorcycle (ZX6R) with a Teensy 4 board (Arduino like). Here is a picture from the electrical schematic:
Measuring BL/R to ground with a multimeter it looks like it's a closed circuit when the switch is open while it opens once the bike starts up and therefore there is oil pressure. Hooked it up on a digital pin with pullup and of course I fried the board. Then I hooked up again the multimeter and (with the bike running) I see an AC voltage with freq and amplitude that changes with RPM. Then I measured it with an oscilloscope as differential voltage BL/R to ground and I see a voltage that oscillates symmetrically around zero with a varying amplitude between a few mV and 1.5V (I bet if rev up the engine more the amplitude and frequency will continue to rise almost linearly).
The BL/R wire goes straight to the dash that powers an LED. The stock dash will be removed.
- any idea of what kind of sensor it is?
- how do I safely measure it with a Teensy board? (digital is 3.3V tollerant)
As you can see I don't have much clue of what I'm doing but I have tools and willing to figure this out :)