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PWM to DC converter with op amp - slowly but steadily rising output voltage

I assembled a circuit to convert a PWM signal generated by an Arduino to a DC voltage in the range 0..10 V. I use the 10k-10u RC filter to convert the PWM signal to DC voltage in the range 0..5 V, ...
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Photodiode and Arduino to measure the speed of a projectile

I am trying to build a chrono to measure the speed of a projectile. I plan to use an Arduino and photodiode. I would like the photodiode to change the state of the Arduino's digital pin when an ...