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Hall and inductive sensors

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Jun 19, 2012, 1:22 PM

Post #1 of 6 (1309 views)
Hall and inductive sensors Sign In


I have a few questions, maybe you will know the answers:

Can I connect a car on-board computer to inductive speed sensor?
And what would be different if I connect a hall sensor instead of inductive sensor?
Thanks in advance

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 19, 2012, 1:25 PM

Post #2 of 6 (1304 views)
Re: Hall and inductive sensors Sign In

It's only programmed to read what it came with.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Veteran / Moderator
Sidom profile image

Jun 19, 2012, 1:33 PM

Post #3 of 6 (1296 views)
Re: Hall and inductive sensors Sign In

I assume you are talking about a hall effect sensor as opposed to an a/c pulse generator which most speed sensors are.
HT is right in the fact you can't add different stuff on the the vehicles PCM, it's not expandable like a desktop or laptop pc.

What is it that you are trying to have me curious


(This post was edited by Sidom on Jun 19, 2012, 1:34 PM)


Jun 19, 2012, 2:05 PM

Post #4 of 6 (1277 views)
Re: Hall and inductive sensors Sign In

I know that the PCM is only getting the information from the sensors, but I am wondering if I can connect and inductive speed sensor to the board computer?
And for the second question, hall sensor's and inductive sensor's digital signal forms are different, but are there any other differences?
I am making a final project for my college, a onboard computer imitation display, and I got these questions.

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Sidom profile image

Jun 19, 2012, 2:26 PM

Post #5 of 6 (1268 views)
Re: Hall and inductive sensors Sign In

They are 2 completely different sensors, one generates a digital pattern the other a sine wave pattern, one generates it's own signal the other uses reference voltage. The a/c signal is very prone to outside interference.

You still haven't told us what it is you are trying to do.....

Any PCM is programmed to receive a series of inputs and based on those inputs will perform various outputs trying to keep the engine in fuel control and achieve the lowest possible emissions....

Those inputs (& outputs) will be listed as PIDs on a scan tool. That PCM is looking for a very speific signal, at a specific amplitude, at a specific time for each PID. If you go outside the box, the PCM doesn't like that and will possibly disable what ever circuit it's monitoring or at the very least turn on the service engine soon light....

I'm not sure what you are doing but you would probably have to engineer a flash for the PCM to be the very least.....


Ultimate Carjunky / Moderator
Discretesignals profile image

Jun 19, 2012, 3:50 PM

Post #6 of 6 (1248 views)
Re: Hall and inductive sensors Sign In

The board also has to have the circuitry, such as an A/D converter, when using analog sensors.

There is a lot more than just wiring up a sensor to a board. The board and of course the software has to be able to handle the type of sensor being used.

The VR sensors and PM generators produce their own voltages. A hall effect sensor needs a voltage source to operate. On most vehicles the power for the hall effect sensor comes from the computer itself.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Jun 19, 2012, 3:58 PM)

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