Intel Galileo Hardware Manual page 14

Hardware
3.3: Ways to Wire Up Inputs
Buttons
A button or switch can be made by simply using any two pieces of metal and touching them
together, but they can be made in many shapes and sizes. The button can be placed between 5V and an
analog input pin (A0 for example). For a more reliable button, it can be connected like in the figure below.
Try pressing the button. Does it do anything? Try different combinations of the button to see how it works.
Button
Resistor
A0
GND
5V
Lesson 3, Figure 2
Potentiometers
normally have the same layout, with three places to connect wires (Lesson 3, Ficure 3).
Potentiometer
Resistor
A0
GND
5V
Lesson 3, Figure 3
Hardware 14