If you are looking for the Chapter 3 content for the 1st Edition of Exploring Arduino, please click here.

Interfacing with Analog Sensors

Parts List

• Arduino Uno or Adafruit METRO 328
• USB cable (Type A to B for Uno, Type A to Micro-B for METRO)
• Half-size or full-size breadboard
• Assorted jumper wires
• 220Ω resistors (×3)
• 10kΩ resistors (×2)
• 10kΩ trim potentiometer
• Photoresistor
• An analog sensor (any of the following):
  • TMP36 analog temperature sensor
  • Sharp GP2Y0A21YK0F IR distance sensor with JST cable
  • ADXL335, ADXL377, or ADXL326 triple-axis accelerometer
• 5mm white LED
• 5mm common-anode RGB LED

Code

Download Code (2nd Edition, Chapter 3)
(Also available on GitHub)

Useful Links

• Arduino Analog Input Pin Reference Page
• Arduino analogReference() Command Page
• Arduino analogRead() Command Page
• Arduino map() Command Page
• Arduino constrain() Command Page
• TMP36 Datasheet (PDF)

Videos

This video will teach you about the Arduino’s analog inputs:

This video is a primer on the differences between analog and digital signals on microcontrollers: