Arduino Programming Part1 Slides

8/17/2019 Arduino Programming Part1 Slides

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Arduino Programming

Part 1EAS 199A, Fall 2010, Lecture 5

Gerald RecktenwaldPortland State University

[email protected]


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Arduino Programming: EAS 199A

Overview

• Discuss details, now that you had a taste

• Arduino Environment

• Basic code components! Two required functions: startup() and loop()

! Variables! Calling built-in functions

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References

• These notes borrow from! Arduino web site

! http://arduino.cc/en/Guide/Environment

! http://arduino.cc/en/Tutorial/HomePage

! Adafruit tutorial #1 and 2

! http://www.ladyada.net/learn/arduino/lesson2.html

! Leah Buechley’s Introduction to Arduino

! http://web.media.mit.edu/~leah/LilyPad/03_arduino_intro.html

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Basic Process

Design the circuit:! What are electrical requirements of the sensors or actuators?

! Identify inputs (analog inputs)

! Identify digital outputs

Write the code! Build incrementally

! Get the simplest piece to work first

! Add complexity and test at each stage

! Save and Backup frequently

! Use variables, not constants

! Comment liberally

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Writing and Downloading Code

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A

A

Write sketch on PC

Download sketch to Arduino


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Running Code While Tethered

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Arduino interacts

with its environment

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Run sketch on Arduino

and send data back to PC

Serial communication

back to host


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Running Code Stand-Alone

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A

Run Arduino in stand alone mode

Arduino interacts with

its environment and

runs on battery power


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Arduino IDE

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IDE =

Integrated

DevelopmentEnvironment

Message pane

Code pane

Stop serial monitor

New sketch

Open sketch

Save sketch

Upload sketch

Open Serial monitor

Tab

controls

Verify/Compile

http://www.arduino.cc/en/Guide/Environment


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Arduino IDE

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Stop serial monitor

New sketch

Open sketch

Save sketch

Upload sketch

Open Serial monitor

Tabcontrols

Verify/Compile

http://www.arduino.cc/en/Guide/Environment


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Arduino Web Site References

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• Overview of the development environment! http://www.arduino.cc/en/Guide/Environment

• Language reference! http://arduino.cc/en/Reference/HomePage

• Code tutorials! http://arduino.cc/en/Tutorial/HomePage


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Code Structure: Header

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Header provides information.Later, it will also contain code


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Code Structure: setup function

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setup function is executedonly once at the start


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Code Structure: loop function

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loop function is

repeated indefinitely


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Code

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Digital I/O Functions:pinModedigitalWritedigitalRead

pinMode(13, Output)

prepare pin 13 foroutputs of voltage


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Code

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digitalWrite(13, HIGH)Sets pin 13 to voltagethat means “on”


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Code

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delay(1000);tells microcontroller to donothing for 1000 ms = 1 s


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Code

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digitalWrite(13, LOW)Sets pin 13 to voltagethat means “off”


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Arduino Variable Types

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int Integer values: 1, 2, 3, -4, 7234

float Values with non-zero fractional part, 7 digitsdouble Currently the same as a float. Normally a

double stores values with non-zero fractionalpart, 15 digits

char Character values: ‘a’, ‘b’, ‘D’, ‘1’

boolean True or false values


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Using variables and functions

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Assigning values:

int red_LED_pin = 5;

pinMode( red_LED_pin, OUTPUT );

digitalWrite( red_LED_pin, HIGH );

Defines the variable type as an integer

Defines the variable name as red_LED_pin

calls the function named “pinMode”

Uses the value stored in red_LED_pin

calls the function named “digitalWrite”

HIGH and OUTPUT are pre-defined constants

Arduino Programming Part1 Slides

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