I am less familiar with electronics and the hardware side of these projects, so I would really appreciate it if someone could take a look and let me know if something stands out as incorrect!
Here is my project. It is using 2 laser diodes (5mW 650nm) and 2 photo-resistors that send an analog signal that will change when the ball breaks the laser:
I basically began by creating this tripwire project:
and then duplicated the laser/sensor part in parallel (as well as the Bluetooth unit). I guess my main concern is around whether or not I have to worry about the voltage amounts since I've put additional sub-circuits in parallel. All sensors and Bluetooth communication is working correctly with my Android application, my main concern is whether or not I am okay leaving this on for longer periods of time (running off of 9V).