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rpm meter help


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migo star

Mon Jun 29 2009, 08:55AM

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hi
i need help in my project
i am working in a project which is used to measure the rpm of the car
but i thought that i can use the analog rpm meter in the car and convert it to digital
but i have some doubts
if analog rpm meter is already found
can i convert its analog signal to digital signal by using ADC
are all types of cars have an rpm meter ?
if the rpm meter is not a good idea
can i use a tachometer or a taco generator?
plz help

gopi

Mon Jun 29 2009, 07:57PM

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Its better if you use a contactless tachometer.

Never cry in front of others...........
Don't give them the pleasure of knowing how much they hurt you.

migo star

Mon Jun 29 2009, 10:09PM

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i know but i have to use some thing to determine the engine speed and then
transmit the data wireless

mangesh.ghugal

Mon Jun 29 2009, 10:28PM

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hi,
its better to tap from the inbuilt speedometer of the car and convert the analog siglal to digital one

migo star

Wed Jul 01 2009, 10:04AM

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hi
i know that but i think that old cars doesn't contain an rpm meter
so that i need a more generic method that can be performed on every car
so that i determined to use a sensor called KMI15/1 which is a rotational speed sensor
but i need to know am i wrong or not?

ExperimenterUK

Wed Jul 01 2009, 04:04PM

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Rev counters often get an input from the ignition system which fires the spark plugs.

Older contact type systems are fairly standard and easy to tap.

Modern electronic systems will be less standardised and harder to tap.