book

Exploring Arduino, 2nd Edition

by Jeremy Blum

November 2019

Beginner

512 pages

11h 50m

English

Wiley

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Why Arduino?Who This Book Is ForWhat You'll Learn in This BookFeatures Used in This BookGetting the PartsWhat You'll NeedSource Code and Digital ContentErrataSupplementary Material and SupportWhat Is an Arduino?An Open Source PlatformBeyond This Book
Exploring the Arduino EcosystemCreating Your First ProgramSummary
Digital OutputsPulse-Width Modulation with analogWrite() Reading Digital InputsBuilding a Controllable RGB LED NightlightSummary
Understanding Analog and Digital SignalsReading Analog Sensors with the Arduino: analogRead() Using Variable Resistors to Make Your Own Analog SensorsSummary
Driving DC MotorsBuilding a Roving RobotSummary
Driving Servo MotorsBuilding a Sweeping Distance SensorUnderstanding and Driving Stepper MotorsBuilding a “One-Minute Chronograph”Summary
Understanding How Speakers WorkUsing tone() to Make SoundsBuilding a Micro PianoSummary

Understanding the Arduino's Serial Communication CapabilitiesListening to the ArduinoTalking to the ArduinoTalking to a Desktop AppSummary
Emulating a KeyboardEmulating a MouseSummary
Understanding Shift RegistersControlling Light Animations with a Shift RegisterSummary
History of the I2C BusI2C Hardware DesignCommunicating with an I2C Temperature ProbeCombining Shift Registers, Serial Communication, and I2C CommunicationsSummary
Overview of the SPI BusSPI Hardware and Communication DesignComparing SPI to I2C and UARTCommunicating with an SPI AccelerometerCreating an Audiovisual Instrument Using a 3-Axis AccelerometerSummary
Setting Up the LCDUsing the LiquidCrystal Library to Write to the LCDBuilding a Personal ThermostatSummary
Using Hardware InterruptsUsing Timer InterruptsBuilding an Interrupt-Driven Sound MachineSummary
Getting Ready for Data LoggingInterfacing the Arduino with an SD CardReal-Time ClocksBuilding an Entrance LoggerSummary
The Electromagnetic SpectrumReceiving Key Presses with the RF LinkMaking a Wireless DoorbellThe Start of Your Smart Home—Controlling a LampSummary
Demystifying BluetoothCommunication between Your Arduino and Your PhoneControlling an AC Lamp with BluetoothSummary
The Web, the Arduino, and YouControlling Your Arduino from the WebInterfacing with Web APIsSummary
Reading DatasheetsUnderstanding the Arduino Schematic
About the Technical Editor

Content preview from Exploring Arduino, 2nd Edition

13Interrupts and Other Special Functions

Parts You'll Need for This Chapter

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
Pushbutton
100Ω resistor
220Ω resistors (×3)
10kΩ resistor
5 mm Common-anode RGB LED
10μF 50V electrolytic capacitor
Piezo buzzer
74AHCT14 hex inverting Schmitt trigger
- CODE AND DIGITAL CONTENT FOR THIS CHAPTER
- Code downloads, videos, and other digital content for this chapter can be found at:
- exploringarduino.com/content2/ch13
- Code for this chapter can also be obtained from the Downloads tab on this book's Wiley web page:
- wiley.com/go/exploringarduino2e

Up to this point, every Arduino program you've written has been synchronous. This presents a few problems, one being that using delay() can preclude your Arduino from doing other things. There are a variety of ways to make your Arduino multitask so that you don't waste any valuable processor cycles doing nothing.

In this chapter, you will learn how to leverage both timer and hardware interrupts to make your Arduino sketches asynchronous. Interrupts make it possible to execute code asynchronously by triggering certain events (time elapsed, input state change, and so on). Interrupts, as their name implies, allow you to stop whatever your Arduino is currently doing, complete a different task, and then return to whatever command the Arduino was previously executing. You will also learn how to execute interrupts ...