I needed a simple air flow meter for a project so I went out to the garage and grabbed a MAF that was pulled from a Hyundai.

I used a PIC 18F2550 board I had from another project and a small boost converter to make it completely USB powered.

This particular MAF has the IAT sensor built in so it reports air temperature too.

Just breathing into it shows a decent response.

I tested it with a couple of fans I had lying around. One thing for sure that little fan shroud that a printrbot comes with really impedes the airflow.

I made a huge right angle nozzle  for a laser engraver that showed little drop in flow rate…

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