System with different Voltages

[KansaiRobot]

Hello everybody. and thank you for all your help

This time, I would like to ask a few question concerning a system in which several parts use different voltages.

So far I have

1. A sensor part. Working with -12V and 12V
2. A motor part that I think works with 110V
3. A controller (5V??)
   

My questions are

1. Can I use the sensor output (an analog signal 0-12V) into a ADC pin of the microcontroller?? I guess not, since I think the max would be 5V
2. How can the output of a microcontroller be used to send signals to a servo controller that works with 110V? is this possible?

Any comment or advice will be greatly appreciated

With my thanks in advance

Kansai