Hi.
How can I create a rpm-meter for my motorcycle that uses the pulses sent to the coil to display the motors rpm, rather than magnets on the front wheel and a hall effect chip. The idea I have is to connect the base of a transistor to the cable going to the coil, and send +6v through. That way I will, hopefully, get 6V pulse which varies between 10hz-100hz depending on the motor RPM. But the problem is how I can make a LCD-display or maybe easier: 7-segment leds, to display the frequency (RPM). Is there some kind of IC that does the math and converts the frequency into a signal which I can feed directly to the 7-segments? Much like the IC which is used to create digital clocks.
Cheers.
Lac.
How can I create a rpm-meter for my motorcycle that uses the pulses sent to the coil to display the motors rpm, rather than magnets on the front wheel and a hall effect chip. The idea I have is to connect the base of a transistor to the cable going to the coil, and send +6v through. That way I will, hopefully, get 6V pulse which varies between 10hz-100hz depending on the motor RPM. But the problem is how I can make a LCD-display or maybe easier: 7-segment leds, to display the frequency (RPM). Is there some kind of IC that does the math and converts the frequency into a signal which I can feed directly to the 7-segments? Much like the IC which is used to create digital clocks.
Cheers.
Lac.