Posted in Arduino Hacks, Musical Hacks Tagged blue pill, optical sensor, optical theremin, stm32, theremin Optical Sensor Keeps Eye On Wandering Saw Blade May 24, 2021 by Tom Nardi 17 Comments ...

Here is a design concept for a cheap single point optical liquid sensor that can detect the presence or absence of certain colored liquids inside a transparent tube. It can be tailored to output a ...