For now, refer to the following pdf file.

1. For voltage regulation, you'll have to find the LM38T05 spec sheet.
2. The LEDs have a current limit, so what component should you use to limit the current?
3. The optoisolator spec sheets are here, here, and here. They should all work the same. I believe that the PS2501 (or maybe the MCT06) has a nice example circuit so you can see how the pull-down resistors should go (to effectively create pull-down voltage dividers).

There are also a set of experiments for working with the Arduino.

• Experiment set no. 1
  1. LED blinking via PWM.
  2. Analog input using a potentiometer as a voltage divider.
  3. Potentiometer plus optisolation and LED blinking.
  4. IMU reading.
  5. Binary switches and digital input
• Experiment set no. 2
  1. PWM output and servo motors.
  2. External trigger.
  3. Motor encoder and counting.

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