I am testing 3d printed propellers, the sensor I am using is the TCRT5000. The problem is the propeller seems to not reflect enough IR light back to the sensor to trigger at >10,000 rpm.
I know hall effect sensors are better for this purpose, but sticking a magnet to the propeller would cause a lot of vibration and change its aerodynamic characteristics.
Ideally, the sensor should not need any modification to the propellers. I am thinking of using a pair of laser and detector modules, but they might face the same problem the IR sensors did.
The propellers I am testing have 2 blades and a cord of about 1cm for the sensor to detect when it passes.
Attached is the code I used to test the sensor, credit to InterlinkKnight on youtube
I would greatly appreciate help on this, thanks.
Tachometer_Using_micros.ino (11.7 KB)