These sensors are like a little clamp-on ammeter that gives you a pulse every time the plug fires. I'd guess the spark current is in the scores of mA, so there's lots of signal. What are you planning on using to read the frequency signal?
Best regards, Spehro Pefhany
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Hi people.
How can i build or use a inductive sensor so i can read the RPM form kart engine 2t 100cm3. Can anyone teach me how this sensor works? Can i make one, with a coil on spark cable?
This are the links from the market sensors :
Thanks for your time.
Best regards.
Marco A. Santos
First of all, if you can pick up the RPM signal from the ignition coil primary or from a phonic wheel on the crank shaft, this is the preferred way: you will get a far cleaner signal.
If you must pick up the signal from the spark cable, you can do it - and most of these sensors do it, even the PI - by capacitive coupling: put a wire near to the spark cable (no need to make a lot of windings), then input the signal to a monostable with an high impedance input (for example a CMOS version of a 555). You will get a signal with duty cycle proportional to the RPM. Then you can filter it to get a proportional voltage and there you go.
-- - asd -
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