You can make your project by hooking your computer to a microcontroller. A microcontroller can directly control a servo. Two of the wires are used for power, a negative and a positive. You can send a pulse to the servo wire and depending on the length, the servo will move.
You can also connect a sensors I/O pin to a microcontroller and send/recieve data. I do not know your intended design, but I will make an example for sake of simplicity.
You have a servo and a light sensor. When the light is on, the microcontroller pulses to the servo to remain at 0 degrees. Say the light is turned off and in your program you can have a line of code that sends a new length pulse to the servo moving it to 180 degrees. Now your sensor is at 180 degrees due to the microcontroller maintaining the circuit.
If you are looking to have a display, then yes, I would use a computer. You can connect your computer to the microcontroller and the microcontroller can wait for an input from the computer.
Well, the bell rang. I'll elaborate more if you need it.