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r u no an me u o

Suree Pumrin, Ph.D.

Semester 2/2556

1

Lecture material taken from:

Lecture 6 Introduction to the ATmega328 and Arduino, CSE

P567, University of Washington,

http://courses.cs.washington.edu/courses/csep567/10wi/lectures/lect

ures.html.

Intro to Arduino Linz Crai Nick Poole Prashanta Ar al Theo

Simpson, Tai Johnson, and Eli Santistevan, Sparkfun Electronics.

Beginning C for Arduino, Jack Purdum, Ph.D., Technology in Action,

.

2

Objectives

Programming the Arduino Uno Rev3 (cont.)

Creating project on Atmel Studio

3

Arduino input/output (cont.)

Programming Atmel studio

4

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Arduino Uno Rev3

5

PWR INUSB

(to Computer)

RESET

(I2C Bus)

POWER

5V / 3.3V / GND

Analog

g aPWM(3, 5, 6, 9, 10, 11)

INPUTS6

a ng n an a ng u

Analo or Di ital?

A few ins on the Arduino allow for us to

modify the output to mimic an analog

.

This is done by a technique called:

Concepts: Analog vs. Digital

To create an analog signal, the microcontroller

uses a techni ue called PWM. B var in the dut

cycle, we can mimic an average analog voltage.

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Introducing a new command

analogWrite( pi n, val ) ;

, ,

6, 9, 10, 11

val 8 bit value (0 255).

=> =>

ove one o your p ns over

to Pin 9In Arduino, open up:

File Exam les 01.Basics Fade

Fade - Code Review Fade - Code Review

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Example-- Fading

Challen e a Chan e the rate of the

fading in and out. There are at least two

them out?

that one fades in as the other one fades

.

Current Loads

NPN Transistor (Common Emitter Amplifier

Circuit

to Digitaln

Digital Input

Connect digital input to your Arduino using Pins # 0 13

(Although pins # 0 & 1 are also used for programming)

Digital Input needs a pi nMode command:

inMode inNumber INPUT

Make sure to use ALL CAPS for INPUT

To get a digital reading:

int buttonState = digitalRead

(pinNumber);

Digital Sensors

Digital sensors are more straight forward than Analog

No matter what the sensor there are only two settings:

Signal is always either HIGH (On) or LOW (Off)

Voltage signal for HIGH will be a little less than 5V on

Voltage signal for LOW will be 0V on most systems

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http://opensourcehardwarejunkies.com/tutorial-03-

Description( ) == ( ) is equal?

( ) != ( ) is not equal?

( ) > ( ) greater than

( ) < ( ) less than

( )

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Using Serial Communication

Method used to transfer data between two devices.

Data passes between the computer and Arduino

through the USB cable. Data is transmitted as zeros

an ones sequen a y.

Arduino dedicates Digital I/O pin # 0 to

receiving and Digital I/O pin #1 to transmit.

Serial Monitor & analogRead()

Initializes the Serial Communication

9600 baud data rate

prints data to serial bus

Serial Monitor & analogRead()

Opens up a

Serial

TerminalWindow

Analo Sensors

2 Pin Analog Sensors = var.

res s orTake two sensors -- Use

the Serial Monitor and findthe range of input values

.

ax na og ea = _________

= _________

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Analog Sensors

Examples:Sensors Variables

Mic soundVolume

Photoresistor lightLevel

Potentiometer dialPosition

Temp Sensor temperature

Flex Sensor bendAccelerometer tilt/acceleration

Sending a Message

{

Ser i al . pr i nt ( Hands on ) ;

er a . pr n ear n ng ;

Ser i al . pr i nt l n( i s Fun! ! ! ) ;

Serial Debugging

voi d loo ( )

{

i nt xVar = 10;

Ser i al . pr i nt ( Var i abl e xVar i s ) ;

Ser i al . pr i nt l n ( xVar ) ;

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Serial Troubleshooting

voi d l oo ( )

{

Ser i al . pr i nt ( Di gi tal pi n 9: ) ;

Ser i al . pr i nt l n ( di gi t al Read( 9) ) ;

}

eve opmen oo s

Atmel Studio 6 is the integrated development

environment (IDE) for developing and debuggingembedded applications based on Atmel AVR and

ARM Cortex-M microcontrollers (MCUs) in

.

The IDE brings together an editor with assisted

code writin a wizard for uickl creatin new

projects, the Atmel Software Framework with free

source code library, a GNU C/C++ Compiler, apowerful simulator, and the front-end for all Atmel

programmers and in-circuit debuggers.

302102444 Introduction toEmbedded Systems

Starting Atmel Studio (1)

Atmel Studio is started by clicking on the Atmel Studio 6.1

shortcut in the Start-Up menu.

, .

you can create new projects and reopen recently used projects,

as well as browse through articles providing tutorials, help and

.

The Start page can also be accessed from ViewStart Page,orAl t+V+G.


32Figure 1. The Project related section of the Start Page

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Starting Atmel Studio (2)

The left section of the start page contains project-related

items: New project - Use this to create a new project. If you are very

new to the concept of software development with Atmel Studio,

- - .

available options are described in detail in Project Management

New example project - To take a step-by-step tour of the

ava a e me p a orms unc ona es us ng e o ware

Framework, click this button .

O en ro ect - Load an existin ro ect, not mentioned onthe Recent projects pane


Creating a project (1)

On the Start Page, click the New Project option.

Figure 2. Project options

Creating a project (2)

1. In the New Project dialog box, select Installed Templates. This lists

e ava a e pro ec ypes.2. For this example, create an GCC C Executable Project.

. , .

4. In the Location box, select a save location.

5. Atmel Studio will suggest a name in the Solution name box. You

can override this name if wanted.

6. Leave the Create directory for solution checkbox checked.

. .

35

oos ng a arge ev ce

When a new project is created, the Device Selection dialog is

displayed and you will be prompted to select the project targetdevice..

36

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Writing and Compiling Code


#include

int main(void)

DDRB = 0xff;

while (1)

z = PINB;

PORTB = z+1;}

}


nc u e

#include

int main(void)

DDRB = 0xff;

while (1)

{

*or n = ; = ; =

{

PORTB = i;

_delay_loop_2(30000);

for (int i = 128; i> 1; i -= i/2)

{

= ;

_delay_loop_2(30000);

}

}


Exercise

1. Code Atmel Studio 6.1 Tool Chain Arduino Setup Video2. Atmel studio

odevoid setup() {

DDRB = B00011111;}void loop() {

PORTB = 1;}3. Datasheet Atmel PORT

ON/OFF LED PORT

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