Microchip Technology AVR-IoT WG Manuel utilisateur

AVR-IoT WG User Guide

AVR-IoT WG Development Board User Guide

Preface

The AVR-IoT WG development board is a small and easily expandable demonstration and development

platform for IoT solutions, based on the AVR® microcontroller architecture using Wi-Fi® technology. It was

designed to demonstrate that the design of a typical IoT application can be simplified by partitioning the

problem into three blocks:

• Smart - represented by the ATmega4808 microcontroller

• Secure - represented by the ATECC608A secure element

• Connected - represented by the WINC1510 Wi-Fi controller module

The AVR-IoT WG development board features a USB interface chip Nano Embedded Debugger (nEDBG)

that provides access to a serial port interface (serial to USB bridge), a mass storage interface for easy

‘drag and drop’ programming, configuration and full access to the AVR microcontroller UPDI interface for

programming and debugging directly from Microchip MPLAB® X IDE and the Atmel® Studio 7.0 IDE. The

AVR-IoT WG development board comes preprogrammed and configured for demonstrating connectivity

to the Google Cloud IoT Core.

The AVR-IoT WG development board features two sensors:

• A light sensor

• A high-accuracy temperature sensor - MCP9808

Additionally, a mikroBUS™ connector is provided to expand the board capabilities with 450+ sensors and

actuators offered by MikroElektronika (www.mikroe.com) via a growing portfolio of Click boards™.

Table of Contents

Preface............................................................................................................................ 1

1. Chapter 1: Overview..................................................................................................3

1.1. Board Layout................................................................................................................................3

1.2. LED Indicators..............................................................................................................................3

2. Chapter 2: Getting Started.........................................................................................4

2.1. Connecting the board to the PC................................................................................................... 4

2.2. AVR-IoT Development on START.............................................................................................. 10

2.3. Advanced Modes........................................................................................................................16

2.4. Migrating to a private Google Cloud account............................................................................. 17

3. Chapter 3: Troubleshooting..................................................................................... 19

4. Appendix A: Hardware Components....................................................................... 20

4.1. ATmega4808.............................................................................................................................. 20

4.2. ATWINC1510............................................................................................................................. 20

4.3. ATECC608A............................................................................................................................... 21

4.4. MCP9808 Temperature Sensor..................................................................................................21

4.5. nEDBG....................................................................................................................................... 22

5. Appendix B: Board Layout.......................................................................................24

6. Appendix C: Firmware Flowchart............................................................................ 25

7. Appendix D: Relevant Links.................................................................................... 26

8. Document Revision History..................................................................................... 27

The Microchip Web Site................................................................................................ 28

Customer Change Notification Service..........................................................................28

Customer Support......................................................................................................... 28

Product Identification System........................................................................................29

Microchip Devices Code Protection Feature................................................................. 29

Legal Notice...................................................................................................................30

Trademarks................................................................................................................... 30

Quality Management System Certified by DNV.............................................................31

Worldwide Sales and Service........................................................................................32

AVR-IoT WG User Guide

1. Chapter 1: Overview

1.1 Board Layout

The AVR-IoT WG development board layout can be seen below.

1.2 LED Indicators

The development board features four LEDs that the demo code uses to provide diagnostic information as

represented in the table below.

Table 1-1. LED Indicators

LED Color Label System Element

Monitored

Details

Blue WIFI Wi-Fi® Network Connection Indicates a successful connection to

the local Wi-Fi® network.

Green CONN Google Cloud Connection Indicates a successful connection to

the Google Cloud servers.

Yellow DATA Data Publication to Servers Indicates that a packet of sensor data

has been successfully published to

the Google Cloud MQTT servers.

Red ERROR Error Status Indicates that an error happened after

the last step.

AVR-IoT WG User Guide

Chapter 1: Overview

2. Chapter 2: Getting Started

2.1 Connecting the board to the PC

First, connect the AVR-IoT WG development board to the computer using a standard micro-USB cable.

Once plugged in, the LED array at the top right-hand corner of the board should flash in the following

order twice: Blue->Green->Yellow->Red. If the board is not connected to Wi-Fi, the Red LED will light up.

The board should also appear as a Removable Storage Device on the host PC, as shown in the figure

below. Double click the CURIOSITY drive to open it and get started.

Note: All procedures are the same for Windows®, Mac OS®, and Linux® environments.

Figure 2-1. Curiosity Board as Removable Storage

2.1.1 The AVR-IoT WG Experience

The CURIOSITY drive should contain the following five files:

• CLICK-ME.HTM - redirects the user to the AVR-IoT web demo application

• KIT-INFO.HTM- redirects the user to a site containing information about the board

• KIT-INFO.TXT - a text file with details about the board like the serial number

• PUBKEY.TXT - a text file containing the public key used for data encryption

• STATUS.TXT - a text file containing the status condition of the board.

Double click on the CLICK-ME.HTM file to go to the dedicated webpage to access the Google Cloud

sandbox account. Figure 2-3 shows an image of the AVR-IoT WG webpage. On this page, the user can

quickly see sensor data, reconfigure the Wi-Fi credentials of the board, download additional example

codes and customize the application. The status markers at the middle of the page, as shown in Figure

2-2, indicate the progress of the system setup. These markers will light up once each stage is completed

successfully. The leftmost marker indicates if the board is connected to the host PC. Next to this, the Wi-

Fi marker lights up once the board is connected to a Wi-Fi network, turning on the Blue LED of the board.

To the right of the Wi-Fi marker, the Google Cloud MQTT marker can be found, indicating the status of

the connection to the Google Cloud server; this corresponds to the Green LED on the board. Finally, the

lighting up of the rightmost marker signifies that data is streaming from the board to the server, by blinking

AVR-IoT WG User Guide

Chapter 2: Getting Started

the Yellow LED on the board. If there is no data streaming, the lower right-hand side of the page will be

showing the video demonstration of the setup instructions.

Figure 2-2. Webpage Status Indicators

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Chapter 2: Getting Started

Figure 2-3. AVR-IoT WG Webpage (No Wi-Fi Connection)

2.1.2 Connecting to the Wi-Fi Network

When the connection has not been established, the lower left-hand corner of the Microsite will show a

wireless network connection window where the user can enter the credentials for the Wi-Fi network. For

this live demonstration, the user needs to fill in the text fields shown in Figure 2-4. These are the details

for the Wi-Fi network setup used during the class. For other means of connection to the internet like

mobile hotspots, the user may fill these fields with the SSID and password of their own Wi-Fi network .

Note: The Wi-Fi network SSID and password are limited to 19 characters. Avoid using names or

phrases that begin or end in spaces.

AVR-IoT WG User Guide

Chapter 2: Getting Started

Figure 2-4. Entering Wi-Fi Credentials in Microsite

Once these details are entered, click the Download Configuration button. This will download the

WIFI.CFG (text) file on the host PC. From the WIFI.CFG’s download location, drag and drop the file to the

CURIOSITY drive to update the Wi-Fi credentials of the board. The Blue LED will light up to show a

successful connection. Otherwise, refer to Chapter 3 to troubleshoot any board issues.

Note: Any information entered in the SSID and password fields is not transmitted over the web, to the

Microchip or Google servers. Instead, the information is used locally (within the browser) to generate the

WIFI.CFG file.

2.1.3 Security Provisions

The secure element (ATECC608A), present on the AVR-IoT WG boards, comes pre-registered within the

MCHP AVR-IoT (sandbox) account on Google Cloud. Each secure element provides an 18-digit

hexadecimal Unique Identification Number (UID) and a public or private key pair, pre-generated using

Elliptic Curve cryptography. The UID can be seen on the URL of the webpage application or via the serial

command line interface (discussed later on in the document). The private key is never revealed by the

AVR-IoT WG User Guide

Chapter 2: Getting Started

secure element but the public key can be viewed in the PUBKEY.TXT file or through the serial command

line interface.

Figure 2-5. Device UID

2.1.4 Visualizing Cloud Data in Real Time

Out of the box, all AVR-IoT development boards are pre-registered to Microchip’s Google Cloud sandbox

account. This account is set up for demonstration purposes only. All data gathered by the sensors of the

AVR-IoT development boards are published on the Microchip sandbox account and can be identified by

the following details:

Project ID avr-iot

Region us-central1

There is no permanent storage or collection of the data published by the boards connected through the

Microchip sandbox account. The full storage of the Google Cloud features will be available to the user

after the board is removed from the demo environment and migrated to a private account.

Once the board is connected to the Wi-Fi and to the Cloud, the avr-iot.com webpage will show a real-time

graph of the data gathered from the on-board light and temperature sensors. Data are transferred and

transformed from the sensor to the cloud through a JSON object: an ASCII string formatted as follows:

{ ‘Light’ : XXX, ‘Temp’: YYY }, where XXX and YYY are numerical values expressed in decimal notation.

Figure 2-6. Real-Time Data on the Microsite

2.1.5 The USB Interface

While the AVR-IoT WG development board comes out of the box fully programmed and provisioned, the

user can still access the firmware through the USB interface. There are three methods to do this: through

AVR-IoT WG User Guide

Chapter 2: Getting Started

drag and drop, the serial command line interface, or through the on-board programmer/debugger using

Atmel Studio 7.0.

I. USB Mass Storage (’Drag and Drop’)

One way to program the device is to just drag and drop a .hex file into the CURIOSITY drive. The AVR C

compiler tool chain generates a .hex file for each project it builds. This .hex file contains the code of the

project. The AVR-IoT WG board facilitates putting code into the board by having this drag and drop

feature. This feature does not require any USB driver to be installed and works in all major OS

environments. Alternative application example.hex files for the board firmware will be available for

download from the downloads section at the bottom of the avr-iot.com webpage.

II. Serial Command Line Interface

The AVR-IoT WG development board can also be accessed through a serial command line interface. This

interface can be used to provide diagnostic information. To access this interface, use any preferred serial

terminal application (i.e. Teraterm, Coolterm, PuTTy) and open the serial port labeled Curiosity Virtual

COM port, with the following settings:

Baud Rate 9600

Data 8-bit

Parity Bit None

Stop Bit 1 bit

Flow Control None

Additional Settings Local Echo: On

Transmit to the Microcontroller CR+LF (Carriage Return + Line Feed)

Note: For users of the Windows environment, the USB serial interface requires the installation of an

USB serial port driver.

The user can control the board by typing the command keywords, listed in Table 2-1.

Table 2-1. Serial Command Line Commands

Command Arguments Description

reconnect - Re-establish connection to the

Cloud

wifi (see Figure 2-8 for example) <Network SSID>, <Password>,

Enter Wi-Fi®network

authentication details

key - Print the public key of the board

device - Print the unique device ID of the

board

version - Print the firmware version of the

serial port user interface

*- Type in one of these three numbers to choose among the following security options:

1. Open

AVR-IoT WG User Guide

Chapter 2: Getting Started

2. WPA/WPA2

3. WEP

Figure 2-7. Serial Command Line Interface

Figure 2-8. Wi-Fi Authentication Example

III. USB Programmer/Debugger interface

For users familiar with the Atmel Studio interface, the AVR microcontroller can also be programmed and

debugged directly via the Atmel Studio 7.0 IDE. The AVR-IoT development board is automatically

detected by the Atmel Studio IDE, enabling full programming and debugging through the on-board

nEDBG interface.

2.2 AVR-IoT Development on START

Atmel START, a quick development tool, can be used to select and customize additional code examples

including single-click support for 100+ Click sensor boards (out of the 450 models available so far). The

codes can be downloaded by clicking Browse Examples on the Atmel START page, as shown in Figure

2-9.

I. Generate the AVR-IoT Development Board Demo

To generate the microcontroller code used on the AVR-IoT development board, select Browse Examples

from the Atmel START home page and follow these simple steps:

AVR-IoT WG User Guide

Chapter 2: Getting Started

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