The sensor were all salvaged from old electronics / machines.
The sensors are three: PM-L24.
The PM-L24 is an ultra-small u-shaped micro Photoelectric Sensor with built-in amplifier. PM series NPN open-collector transistor sensor plays a key role in the miniaturization of our equipment. This sensor is equipped with two outputs one for light-on and other for dark-on sensing.
I am building a breakout board to power them, and “split” the signals for interfacing with the X-Controller; Details in a future post.
In the near future I will post some pictures of their locations in a build tour video / photos.