Paul,

Can you remind me how you generated your mass flow vs. voltage data
for a hot wire MAF?  Was the data published somewhere?

Matt-

I don't think that was me but can you forward the message or messages you are
referring to?

I suggested holding it out the window of a moving car.

To convert it to a pulse width.
It can be done for sure using a saw tooth wave generator and a comparator.
The question then becomes "how linear is the saw tooth weave generator.

Paul Lamar

--



Matt,

I bought an MAP sensor on eBAY for a reasonable price.   Attached is an
EXCEL file showing the voltages compared to airflow.   Flows will vary
slightly depending on how you use it. My use is in a flow bench so I can
do comparative testing.

Cheers


Doug in Japan

Thanks for the data Doug.
Bad news for the simple 555 system. Oh Well back to the linear manifold pressure
sensor.

Paul Lamar

Paul,

Perhaps you didn't get the Excel spread sheet showing actual voltage
outputs at different airflows.

Here it is again.

Doug in Japan.

I did get it and you had the data plotted.
The plot jpg is what I screen captured and up loaded.

Here it is again.

Paul Lamar