Number 2: Explanation of setup
There is 2 photocell resistors that will allow the motor to spin when they are uncovered, the circuit will activate when photocell 1 becomes uncovered from being initially covered, which because of the voltage divider active the transistor and then the relay switch to allow the motor to turn on. The motor will active the physical/mechanical part of the Rube Goldberg not yet drawn, the motor will spin in a string on a rod object that will pull it off another, on the other rod another string will pull a block over the second photocell to turn off the motor after the motor activates the next persons circuit.
|Slide to slide over photo resistor|
|Motor and string|
Number 4: Videos
Number 5: Failures
The main failures I've have so far have been getting the transistor to activate the relay, that was solved by bumping up the voltage to a value that would work just by slowing increasing it until it triggered.