Lab 3: DC, Steppers and Servos, Oh My!

Objectives

• Motors!
• Understand the pros and cons of different motors

Components

• The basics (Arduino, breadboard, jumperwires)
• DC Motor
• Servo motor
• Stepper motor
• Transistors (PN2222, PN9207)
• Diodes

Overview

In this lab, we're going to wire up our first motors and make sure we can make the motors go.

1. Build out the circuit below:

2. That transistor is a PN2222 (NPN).
3. Fire up the IDE.
4. Write a script to turn the motor on full speed.
5. Modify your script to run the motor at half speed.

1. You got the motor moving at partial speed and full speed. How can you make the motor go the other way?
2. What is the purpose of the diode in this circuit?
3. What is the purpose of the transistor in this circuit?
4. What is the operating voltage of this motor?

Exercise 2: Servo Motor

1. Build out the circuit below:

2. Write a script to turn the motor on full speed.
3. Modify your script to run the motor at half speed.

Exercise 3: Stepper Motor