[HELP] RPM meter with inductive pickup

[joephie]

i want to create an RPM meter for motorcycle, using inductive pickup that wounded around spark plug cable on a motorcycle... i got this schematic

it says that the output can be conected directly trough µCrontroller, but i don't understand how to read it on µCrontroller... could anyone help me ?!
im using AVR ATmega32... here is the scematics *.sch [eagle]

 

[bobcat1]

Hi

According to the circuit the 555 produce a pulse for every spark - use external interrupt input in your micro controller to advance a software counter for every interrupt received

All the best

Bobi

The microcontroller specialist

 

[joephie]

i have dificulties programing using basic compiler... could u help me