Antilock brake sensor. Can it be read?

Archiver

Hello all... I am new to the group.

I am wandering if anyone here is familiar with the ABS wheel sensor
used on my 95 Firebird. I know there is a sensor plugged into the
hub... and I know it generates output of some type as long as the
wheel spins, but I have no idea how to read the output from it.

I have a project in mind (maybe an electric car... maybe something in
between) but this is one of the obstacles on my list. I very much
want to read the output from this part into a Stamp module while the
vehicle is moving.

All help is appreciated!!

Thanks in advance.

-- Tim


PS You can meet me and my daughter at:
http://tim.mindriot.net

Archiver

Hi Tim,

The sensor is probably an inductive proximity switch, outputing a
pulse every time it moves past a toothed target gear.

A simple solution to measure this output and read it into the stamp
is to use a F/V (Frequency to Voltage) converter and also an ADC
(Analog to Digital).

National make a low cost F/V chip especially for this purpose, the
LM2907. A pdf containing circuit diagrams and information can be
found at http://www.national.com/pf/LM/LM2907.html.

Depending on the resolution of the measurement that you're after, you
can use a low cost 8bit ADC such as the National 0831. There is an
example of how to use this ic to talk to the stamp in the Basic Stamp
handbook (available at www.parallaxinc.com).

This is probably the simplest and easiest way to get what you're
after. If you're after higher resolution, there are plenty of
examples of how to use a MAX186 (12bit ADC) with a Stamp floating
around the net.

I hope the above helps.

Simon


--- In basicstamps@y..., MisterGuru@h... wrote:
> Hello all... I am new to the group.
>
> I am wandering if anyone here is familiar with the ABS wheel sensor
> used on my 95 Firebird. I know there is a sensor plugged into the
> hub... and I know it generates output of some type as long as the
> wheel spins, but I have no idea how to read the output from it.
>
> I have a project in mind (maybe an electric car... maybe something
in
> between) but this is one of the obstacles on my list. I very much
> want to read the output from this part into a Stamp module while
the
> vehicle is moving.
>
> All help is appreciated!!
>
> Thanks in advance.
>
> -- Tim
>
>
> PS You can meet me and my daughter at:
> http://tim.mindriot.net