Wheel Speed Signal Generator

[jeff_5_7]

Hi

I want to mimic the square wave of the wheel speed sensor on my car. I believe wheel speed sensor is active, it has one 12+ power wire and a - wire with the actual sensor in between the two.

I can generate a 5v square wave simply by switch a pin high and low on arduino. I believe this will be enough to send a “speed” signal to my ecu.

If I put the negative wire to say pin 12 on arduino and switch it low and high will this work to create a 5v square wave? I am worried since the ecu is 12v it could burn up the arduino. But seeing as how only pulsing a 5v signal into the negative of wheel speed signal I think it might work.

I don’t want to burn up another arduino board so I haven’t just hooked it up to try yet.

[Paul_KD7HB]

@jeff_5_7

If I put the negative wire to say pin 12 on arduino and switch it low and high

Negative compared to what? Ground?

[jeff_5_7]

Sorry yes I just want to hook the negative from the 12v wheel speed sensor ecu directly to my arduino to send a 5v square wave into the ECU.

ECU is powered by 12v on bench and I want to make it think the wheel is rotating. I believe sending a 5v square wave from arduino up the negative pole of the speed sensor wire to the ecu will do this.

Just worried about accidentally burning up the arduino

[Paul_KD7HB]

@jeff_5_7

Sorry yes I just want to hook the negative from the 12v wheel speed sensor ecu directly to my arduino to send a 5v square wave into the ECU.

How will the Arduino know it is a negative, since you are providing nothing for it to reference to? How many wires are coming from the wheel sensor ECU?

[TomGeorge]

Hi,
I think we need a basic wiring diagram of how you propose to connect it all.

Thanks.. Tom...

[johnerrington]

How to make a schematic you can post.

When you submit a question on the forum you will usually need to add a schematic (circuit diagram). The tutorial that follows will explain some ways to create a useful image; however lets start by explaining how to add the image to your post. Its easy. Having created the image all you need to do is : Save the image somewhere convenient - maybe your desktop Start your post, and place the cursor (insertion point) where you want the image to be shown; [upload image to forum] 3: click th…

[hammy]

Have a google for this , there are other projects out there for simulators for car ecu’s.

You could just opto isolate your Arduino output , then you can be Sure of no problems .