View source for S16: Sound Buddy

=== Grading Criteria ===
<font color="green">
*  How well is Software & Hardware Design described?
*  How well can this report be used to reproduce this project?
*  Code Quality
*  Overall Report Quality:
**  Software Block Diagrams
**  Hardware Block Diagrams
**:  Schematic Quality
**  Quality of technical challenges and solutions adopted.
</font>

== Project Title ==
=== Sound Buddy ===

== Abstract ==
Have you ever wanted your home's sound system to follow you from room to room? Sound Buddy is a portable, wireless speaker system designed to play your favorite songs and follow you to whichever room you desire. Load your favorite MP3 songs onto a micro SD card and plug it into Sound Buddy and you are ready to enjoy your music anywhere at home.

With the use of several technologies such as the Nordic transceiver, MP3 decoder, and SJOne board, Sound Buddy comes to life!

== Objectives & Introduction ==
Show list of your objectives.  This section includes the high level details of your project.  You can write about the various sensors or peripherals you used to get your project completed.


Sound Buddy can be broken down into four main efforts: reading the MP3 file, formatting and sending the MP3 over Nordic wireless, receiving the MP3, decoding the MP3 to audio. 

'''Reading the MP3 File'''
The MP3 file is read from the SD card on the SJSU ONE board. 

'''Converting and Sending MP3 over Nordic Wireless'''
The MP3 file is formatted for Nordic wireless transmission. Then sent to two SJSU ONE boards. 

'''Receiving MP3 Files'''
The receiver boards receive the files and prepare them for transmission over an I2C bus to the MP3 decode board.

'''Decoding MP3 to Audio'''
The decode boards receive the files over the SPI communication link, then reformat the file to standard MP3 and decode it to analog. 


=== Team Members & Responsibilities ===
*  Brigitte De Leon
**  Nordic Wireless
*  Catherine Gamboa
**  PCB Design/Delivery

*  Hudo Assenco
**  Integration Master
*  Yang Thao
** MP3 Decoder

== Schedule ==
Show a simple table or figures that show your scheduled as planned before you started working on the project.  Then in another table column, write down the actual schedule so that readers can see the planned vs. actual goals.  The point of the schedule is for readers to assess how to pace themselves if they are doing a similar project.
 
{| class="wikitable" style="width: 90%; height: 40%;"
|-
! scope="col" style="width: 75px"| Week#
! scope="col" style="width: 75px"| Date
! scope="col"| Task
! scope="col"| Actual
|-
! scope="row"| 1
! style="text-align: center;"| 03.14
| <li>Finalize Schedule <li>Determine PCB board circuit<li>Order Parts<li>Update Wiki
| <li>Completed
|-
! scope="row"| 2
! style="text-align: center;"| 03.21
| <li>Design PCB schematic on Eagle<li>Review Nordic Wireless component on SJOne Board<li>Update Wiki
| <li>Completed
|-
! scope="row"| 3
! style="text-align: center;"| 03.28
| <li>Order PCB<li>Develop Nordic communication protocol<li>Write code to allow Nordic wireless communication between two boards<li>Update Wiki
| <li>PCBs received <li>Missing the antennas to test Nordic code (move to 4/11 week)
|-
! scope="row"| 4
! style="text-align: center;"| 04.04
| <li>Build MP3 decoder prototype circuit and verify its functionality<li>Verify the Nordic wireless data transfer code works<li>Update Wiki
| <li>Completed
|-
! scope="row"| 5
! style="text-align: center;"| 04.11
| <li>Load small MP3 into SD card and send out to MP3 decoder to hear audio<li>Update Wiki
| <li>Incomplete
|-
! scope="row"| 6
! style="text-align: center;"| 04.18
| <li>Integrate the system (SD from Master -> Nordic Wireless -> Flash -> MP3 decoder circuit -> Speakers)<li>Update Wiki
| <li>Incomplete
|-
! scope="row"| 7
! style="text-align: center;"| 04.25
| <li>Solder parts onto PCB<li>Integrate into test system<li>Update Wiki
| <li>Incomplete
|-
! scope="row"| 8
! style="text-align: center;"| 05.02
| <li>Integration test<li>Update Wiki
| <li>Incomplete
|-
! scope="row"| 9
! style="text-align: center;"| 05.09
| <li>System test<li>Update Wiki
| <li>Incomplete
|-
! scope="row"| 10
! style="text-align: center;"| 05.16
| <li>Run final tests<li>Prepare for DEMO --> 05.20
| <li>Incomplete
|}

== Parts List & Cost ==
{| class="wikitable"
|-
! scope="col"| Item#
! scope="col"| Part Desciption
! scope="col"| Qty
! scope="col"| Cost per Item
! scope="col"| Cost
|-
! scope="row"| 1
| STA013 MP3 Decoder Chip
| 2
| $11.67
| $23.34
|-
! scope="row"| 2
| CS4334 DAC
| 2
| $2.97
| $5.94
|-
! scope="row"| 3
| Audio Jack 3.5mm
| 3
| $1.50
| $4.50
|-
! scope="row"| 4
| Crystal 14.7456MHz
| 2
| $0.95
| $1.90
|-
! scope="row"| 5
| Printed Circuit Boards
| 2
| $-.--
| $32.05
|-
! scope="row"| 6
| SparkFun SOIC to Dip Adapter 8-pin
| 1
| $2.95
| $2.95
|-
! scope="row"| 7
| SparkFun SOIC to Dip Adapter 28-pin
| 1
| $7.90
| $7.90
|-
! scope="row"| 8
| Breakaway headers
| 2
| $1.50
| $3.00
|-
! scope="row"| 9
| Screw Terminals 3.5mm Pitch(2-Pin)
| 3
| $0.95
| $2.85
|-
! scope="row"| 10
| Antennas
| 3
| $4.20
| $12.60
|-
! scope="row"| 11
| Resistors
| 10
| $0.19
| $1.92
|-
! scope="row"| 12
| Capacitors
| 120
| $---
| $20.11
|-
! scope="row"| 13
|Inductors
| 2
| $0.19
| $0.38
|-
! scope="row"| 14
| Voltage Regulators
| 2
| $0.62
| $1.24
|-
! scope="row"| 15
| SJOne Board
| 3
| $80.00
| $240.00
|-
! scope="row"| 
| Total Cost
|  
| $-.--
| $-.--
|-
|}

== Design & Implementation ==
The design section can go over your hardware and software design.  Organize this section using sub-sections that go over your design and implementation.


<br>
===The Top Level of Sound Buddy===

<br>

[[File:Sound Buddy Top Level.jpg]]

===The Master Board===

[[File:Sound Buddy Master Board.jpg]]

===The Receiver Board===


[[File:Sound Buddy Receiver Board.jpg]]

===The Decode Board===

[[File:Sound Buddy Decode Board.jpg]]


The decode board is a custom board whose function is to receive raw MP3 formatted data and decode it for digital to analog conversion.


[[File:Sound Buddy Decode Board Top Level.jpg]]

=== Hardware Design ===
Discuss your hardware design here.  Show detailed schematics, and the interface here.

[[File:Decode Brd Schematic.jpg]]

The Master board and receiver boards are SJSU ONE boards used in standard configurations. 
The Decode board is a custom build PCB.  The Decode board consists of three functions: MP3 Decode, DAC, and Voltage Regulator, as well as a 34 pin connector.

'''MP3 Decode'''
<br>
[[File:Sound Buddy MP3 Decoder Schematic.jpg]]

The MP3 Decode board uses a STA013 MP3 Decoder chip. A detailed data sheet can be found at: [https://www.pjrc.com/mp3/sta013.html STA013 MP3 Decoder]

We used the standard configuration suggested by the manufacturer. The manufacturer suggests all signals from 5 volt boards and all 5 volt supplies be stepped down to 3 volts. Since the signals from the SJSU ONE board are in the 3 volt range, and power is supplied by the SJSU ONE board, we did not have to implement the any voltage step downs. 

We implemented the single byte method, writing to consecutive bits in not recommended. 

<br>
'''DAC'''
<br>
[[File:Sound Buddy DAC.jpg]]

The DAC chosen for this design is the CS4334, which is the one recommended by the MP3 Decode manufacturer.  A detailed data sheet can be found at: [https://www.pjrc.com/mp3/sta013.html CS4334 DAC]
The speakers are battery powered, so the connection to the speakers does not require power.

<br>
'''Voltage Regulator'''
<br>
The voltage regulator chosen for this board is the LM7805, configured using the standard application configuration. A detailed data sheet can be found at: [https://www.fairchildsemi.com/datasheets/LM/LM7805.pdf LM7805 Voltage Regulator]

===PCB Layout===

The PCB is a 2 layer board designed to plug into the SJSU ONE board connector directly. 

[[File:Decode-SJSU ONE Connection, Side View.jpg]]

'''The PCB layout''' 

[[File:PCB.png|800px]]

=== Hardware Interface ===
In this section, you can describe how your hardware communicates, such as which BUSes used.  You can discuss your driver implementation here, such that the '''Software Design''' section is isolated to talk about high level workings rather than inner working of your project.

There are four hardware communication interfaces in the Sound Buddy: SD card reading; Nordic wireless transmission; I2C bus communication between the Receiver board and the Decode board.

'''SD Card Reading'''
The Sound Buddy reads the SD card using an SPI bus interface. The Sound Buddy will assume MP3 standard files are on the SD card. The rate at which the SD card is read is ???, this allows for reformatting of the data for transfer over the Nordic wireless communication link. 

'''Nordic Wireless'''
The maximum data transfer rate for the Nordic wireless is 250 Kbps. The Sound Buddy operates near this maximum. 

'''I2C Bus Communication'''
The I2C communication delivers, at minimum, 128 Kbps to the decode board. This means the Sound Buddy is capable of delivering radio quality sound.  Sound Buddy is capable of reading ITunes MP3 standard (256 Kbps) but play quality is limited to 128 Kbps.

=== Software Design ===
Show your software design.  For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level.  Do not show the details of the code.  For example, do not show exact code, but you may show psuedocode and fragments of code.  Keep in mind that you are showing DESIGN of your software, not the inner workings of it.

[[File:Sound Buddy Software Top Level.jpg]]





'''Writing to the Decode Board'''


[[File:STA013_Software_Tasks.jpg‎ ]]

=== Implementation ===
This section includes implementation, but again, not the details, just the high level.  For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash.  You can include sub-sections for each of your component implementation.

'''Nordic Wireless Communication'''
<br>
[https://mcuoneclipse.com/2013/07/20/tutorial-ultra-low-cost-2-4-ghz-wireless-transceiver-with-the-frdm-board/  Nordic Wireless User Manual]
<br>
[http://blog.diyembedded.com/]

'''Nordic Wireless Transmission'''
<br>

'''Step 1:''' Call the init function and set the device as a transmitter. <br>
'''Step 2:'''Check to make sure the FIFO is not full.  Do this using TX FIFO  (it is available in STATUS and FIFO_STATUS registers.)<br>
'''Step 3:'''Call the nrf2401_write_tx_payload() function. <br>
'''Step 4:'''Wait for the TX_DS interrupt to go active before sending another packet. <br>

*The transmitter should allow a 130usec delay if in Enhanced Shockburst mode, It may not be necessary in standard Shockburst. <br>

We use the nrf2401_power_up() and nrf2401_power_down() functions to conserve power. <br>

For debugging we use the nrf240`_get_all_registers() function. We pass it a 36 byte array and we can read every register in the 24L01. <br>
<br>
'''Nordic Wireless Receiver'''
<br>



'''STA013 Decoder Tasks'''
<br><br>
'''Step 0:''' There must be a reset to the STA013 device. For the debug board we did a hard reset, for the final version this is sent from the Receiver board. 
<br>
<br>
'''Step 1:''' Check for the presence of the STA013, read from address 0x01.  There should be an ACK, then the data returned should be 0xAC.  These two data points mean the device is present and communicating properly. 
<br>

We write :i2c read 0x86 0x01 10   -- this returns 0xAC for the first byte.  So we know the board is live. 

'''Step 2:''' Transmit  p02_0609.bin, which is supplied by ST. This file has 2007 address and data pairs. Do this by writing a loop that passes each pair to the sta013_write function. Each ACK should be checked and the process aborted if a write does not receive any of its ACLs.  If this step is not accomplished the STA013 may not operate properly. 
We may need to include a 0.6 ms delay after sta013_write if the address is 16. 

'''Step 3:''' Once the config file is sent, the board specific settings are sent. For a 14.7456 MHz crystal and a CS4334 DAC.  The easiest way to send these settings is by attaching them to the end of the bin file. (The bin file is actually an ASCII file with a .bin extension)

'''Step 4:''' Tell the STA013 to start operating. 
Do this by writing a ‘1’ to the address 114 (or 0x72) to tell the STA013 to start running, 
then a 1 to address 19 (or 0x13) to tell it to start playing. 
The  DATA_REQ pin should be asserted

When you start feeding in valid MP3 data, the chip detects the MP3 sample rate and creates the correct clock for the DAC and starts pushing data into it. 
The STA013 will ignore non-MP3 data so it is safe to send the entire file without needing to strip out ID3 tags, etc.
The STA013 expects the most significant bit first, which corresponds to the SPI standard.

[https://www.pjrc.com/mp3/sta013.html#doing_config STA013 User Manual]

== Testing & Technical Challenges ==

'''Proto-Type'''

[[File:S16_SoundBuddy_ProtoType.png|600px]]

Describe the challenges of your project.  What advise would you give yourself or someone else if your project can be started from scratch again?
Make a smooth transition to testing section and described what it took to test your project.

Include sub-sections that list out a problem and solution, such as:

=== My Issue #1 ===
Discuss the issue and resolution.

'''Nordic Wireless'''
<br><br>


'''Receiver Board'''
<br><br>

'''MP3 Decoder'''

== Conclusion ==
Conclude your project here.  You can recap your testing and problems.  You should address the "so what" part here to indicate what you ultimately learnt from this project.  How has this project increased your knowledge?

=== Project Video ===
Upload a video of your project and post the link here.

=== Project Source Code ===
*  [https://sourceforge.net/projects/sjsu/files/CmpE_S2016/ Sourceforge Source Code Link]

== References ==
=== Acknowledgement ===
Any acknowledgement that you may wish to provide can be included here.

=== References Used ===
List any references used in project.
* Wiki Page Development
** <span class="plainlinks">[https://en.wikipedia.org/wiki/Help:List#Multi-column_bulleted_list Wiki Help List]</span>
** <span class="plainlinks">[https://en.wikipedia.org/wiki/Help:Link Wiki Help Link]</span>

* Project
** Nordic Wireless
***<span class="plainlinks">[http://www.socialledge.com/sjsu/index.php?title=Nordic_Low_Powered_Mesh_Network_stack Nordic Low Powered Mesh Network stack]</span>
** MP3 Decoder
***<span class="plainlinks">[https://www.pjrc.com/mp3/sta013.html How To Use The STA013 MP3 Decoder Chip]</span>

=== Appendix ===
You can list the references you used.