Arduino RPM counter for a Motorcycle - Can I just use an analog pin?

Using Arduino Motors, Mechanics, Power and CNC
1

Hi all,

I am trying to setup an RPM counter using a coil in the spark cable. I saw a lot of people using fancy schematics for doing so. My question is should I worry with burning my arduino or could I just go ahead and plug the coil in an analog pin?

Thanks in advance!
PS: I saw a lot of related topics but none solved my particular doubt.

2

The problem you will have is that of over voltage on the input pin. They are only rated to just over 5v and your coil could give a lot over that. This is why there is circuitry to reduce the voltage before it gets to the pin.

Weedpharma

3

What about using a hall sensor near de spark cable? Can it work? (I am also not sure what hall sensor to use in this case)

4

Go to search at the top of the page and type in "inductive tachometer".
You will find many posts on exactly what you are trying to accomplish and an explanation of why you need some type of electronic circuit between your spark plug wire and your input pin.