RPM Input

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TheStigP11GT
 

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RPM Input

Post by TheStigP11GT »

I am doing a small project to build a RPM Window Switch using Arduino, I have searched online and can not find the answer, but basically, I am looking to get details on how to Measure the RPM from the ECU.

I am unsure whether it uses voltages or digital signals or what, but basically I would like the Arduino to display the RPM on the display screen and Com Input so I can then build the rest of the code around it. If it is voltage or other signal is there any other conversion which would need done to build into the code to interpret the data?
Matt
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Re: RPM Input

Post by Matt »

Yes it is a voltage from the ECU. 5V pulse which frequency increases as RPMs increase
TheStigP11GT
 

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Re: RPM Input

Post by TheStigP11GT »

Matt wrote:Yes it is a voltage from the ECU. 5V pulse which frequency increases as RPMs increase
Thanks Matt, Would a ADC converter convert the values to a number so it can be displayed using an Arduino?
Eric
 

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Re: RPM Input

Post by Eric »

I once got this working on an Arduino using a 74HC14 (schmitt trigger) and frequency counter library or freqmeasure library...can't remember which one I used, but I think both worked.
Matt
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Re: RPM Input

Post by Matt »

No ... you need to count pulses in a time period to measure. Frequency counters or similar extra ICs like Eric mentioned can assist
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