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…
