Interfacing a VR sensor

Projects General Guidance
1

I'm looking at ways to interface several VR sensors to the Arduino, and wondering what ideas you have...

I know one sensor is only going to be connected to the Arduino, so I have control over which wire I connect to ground, it'll output about a 2.5Khz sine wave, an I want to sense it with a interrupt enabled pin.. Do you think putting it through a 5V op-amp with a very small positive feedback would be sufficient? How about if just have a resistor (Value TBD... lets say 3k ohm) in series with it, and then a diode/Zener pair to prevent it from dropping below 0 V or above 5V.. this would clip the wave so I only get one half of it.. I know that as the frequency of the output drops, so does the voltage produced by the VR sensor.. At low speeds I may never get the voltage needed to trigger the interrupt, but I'm not terribly concerned about it. Any ideas are appreciated.

Thanks

2

You should specify what you mean by VR.

Virtual Reality?

Voice Recognition?

Neither of those seem to make sense in the context you're describing.

3

Voluntary Redundancy?

Ventricular Tachycardia?

Véhicule Récréatif?

Ventricular Rate?

Vanilloid Receptor?

4

Sorry about the ambiguity.. Variable reluctance sensor is the one I'm talking about...

5

Have you got a link to the sensor you want to use?

6

nope.. it's on a Holset turbo for the shaft speed.. who knows where I'd find the datasheet for that!

7

Hi,
I assume it is just a 2 wire sensor, so just a coil with a magnetic core, detecting a metal marker on the turbo shaft.

Tom.... :slight_smile:

8

TomGeorge, yep, that's about all it is I think.. just wondering the easiest way to get an approximation of a square wave out of it

9

Google a MAX9926 VR conditioner.

10

I was hoping for an easier method,... yes, those are the right way of doing this... I'm going to go with a 2 channel and have a spare for future use.