Why not use a pitot tube? Would be easier to make, and you could also make the manometer or buy it.
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Does it have to be digital ? The simplest way to do it is to measure the output voltage of a DC motor driven by the cups. Steve
Do you mean like the classic 4 arms and half-spheres ?
i was hopping to make a 3 arm one with half spheres. it was the digital electric parts that i need a bit of a hand with like building a circuit for it