Measure the speed of a motor
thingiverse
In order to design the propeller for my 3D printed RC boat (coming soon!) I had to figure out the performance characteristics of some Johnson motors I bought on Ebay so I designed this little device. The first 3D printed part is the mount where you fit the Johnson or 540 type electric motor and a photodetector. The second 3D printed part is a rotor for the motor that breaks the beam twice per revolution. When connected to an Arduino this makes it easy to measure the relationships between current, acceleration and speed (RPM).
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