I am preparing to build a digital tach using a microcontroller (PIC MICRO for those who know what that is) anyways, i am having a hard time obtaining an oscilloscope (expensive as ****) to hook up to an ignition (blue wire) to figure out the signal. My question is: how many pulses are there per revoltion and the max voltage of each pulse.
Thanks in advance...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMmaster &raquo;</TD></TR><TR><TD CLASS="quote">I am preparing to build a digital tach using a microcontroller (PIC MICRO for those who know what that is) anyways, i am having a hard time obtaining an oscilloscope (expensive as ****) to hook up to an ignition (blue wire) to figure out the signal. My question is: how many pulses are there per revoltion and the max voltage of each pulse.
Thanks in advance...</TD></TR></TABLE>

There are other sensors to take the signal off of. Like the Crank Position Sensor, which is two pulses per revolution.

A sensor signal might be less noisy (with proper ground) than an ignition signal.

-PHiZ

 

So what kind of signal is present on the tach wire (blue)?