Presentation at OSHWCON 2012, Madrid

1. ArduRadio:
Playing Internet Radio with Arduino
Javier Montaner
montanerj@yahoo.com
@tumaku_
OSHWCON 2012 (Madrid)

2. Agenda
 Introduction
 Bill of Materials
 Key Learnings
 Project Status & Next Steps
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3. Introduction
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4. 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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5. 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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6. Bill of Materials (BOM)
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7. 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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8. 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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9. 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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10. 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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11. 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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12. Key Learnings
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13. 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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14. Project Status & Next Steps
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15. 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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16. 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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17. More Info
Javier Montaner (Madrid, Spain)
montanerj@yahoo.com
@tumaku_ (twitter)
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