Hello everyone, I am pretty new to arduino but have some experience. I am using my arduino to read tachometer data from my miata and I am using a 5K and 2.1K ohm resistor voltage divider. I have the resistors hard wires with very short lengths of wire to help reduce the noise. Using a multimeter, the car ideals around .17 volts, however, my arduino code will read the analog pin anywhere from 30-700 in the serial monitor. (I realize this isnt the actually voltage just the analog read) with some 0 and 1023. anyone know if my setup is off or if there is a way to denoise the voltage coming in? Thanks in advance
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