OSHWCON 2012 (Madrid)

Javier Montaner

montanerj@yahoo.com

@tumaku_

ArduRadio:

Playing Internet Radio with Arduino

OSHWCON 2012 (Madrid)

Agenda

Introduction

Bill of Materials

Key Learnings

Project Status & Next Steps

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Introduction

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Internet Radio on Arduino

Exploratory work to understand what can(not) be done with

Arduino and similar HW platforms

Based on commercial Arduino boards and shields:

Arduino Mega

Ethernet

MP3

NFC

Final source code will be opened through github

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Project Scope

Build an Arduino-based device that plays internet streaming

radio

Use simple touch user interface (NFC/RFID) to select radio

stations

Learn about open HW

Share results with the community

A similar concept has been explored by Jordi Parra (@zenona)

in its SpotifyBox project: http://postscapes.com/spotify-box

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Bill of Materials (BOM)

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Arduino Mega 2560

256 KB

54 Digital I/O Pins

Can be implemented on Arduino

UNO but memory and available

PINs start being a problem

http://arduino.cc/en/Main/ArduinoBoardMega2560

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Arduino Ethernet Shield

Based on Wiznet W5100

10/100 Mb

TCP/IP library

Includes micro-SD card slot

Controlled through SPI

http://arduino.cc/en/Main/ArduinoEthernetShield

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Sparkfun MP3 Player Shield

Based on VS1053B

Plays Ogg Vorbis/MP3/

AAC/WMA/MIDI

3.5mm stereo output jack

Includes micro SD card slot

Controlled through SPI

https://www.sparkfun.com/products/10628

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SeeedStudio NFC Shield

Based on NXP PN532

Support Reader, Card

emulation and Peer to Peer

PCB printed antenna

Controlled through

software SPI

http://www.seeedstudio.com/depot/nfc-shield-p-916.html

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Total Cost of Prototype in €

Component Price

Arduino Mega €41

Ethernet Shield €29

MP3 Shield €32

NFC Shield €24

Speaker €15

Total €141

This cost is not suitable for a commercial product but it is extremely cheap to build a

working prototype

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Key Learnings

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General

Open HW community is very active

Quality of documentation varies greatly but people are

usually helpful and reactive

Google is a great source of (hidden) information

Arduino is a learning and prototyping tool. There are

definitely more powerful and cheaper platforms but almost

any technology that you can think of has already been

integrated in/through an Arduino shield

There are other HW solutions from alternative vendors for

all the elements in the BOM

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Project Status & Next Steps

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Current Status of the Project

I have built a working and stable prototype

It plays32kbps streams from internet

It works with NDEF formatted (NFC Forum) Mifare

Ultralight tags (type 2)

I use Android application to write the content of the tags

Arduino script size is around 34kB (including all the libraries)

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Next Steps?

Clean up all the code and publish it in github

Replace the Ethernet shield by the new Arduino WiFi shield

and try to play streams with higher bitrates

Integrate AM/FM Radio shield

Improve the NFC library to support other types of NFC Tags

Implement Card Emulation and/or Peer-to-Peer mode in

NFC library to interact directly with an Android application

over NFC

Port the solution to an Android USB dongle (can be bought

now for less than €50)

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More Info

Javier Montaner (Madrid, Spain)

montanerj@yahoo.com

@tumaku_ (twitter)