F12: Android Controlled MP3

Wirelessly Control a MP3 Player

Abstract

Using an Android program to wirelessly control a MP3 Player. The Android program will contain functions to command the operation of the MP3 player. The user can press a button to play a song or change the volume.

Introduction & Features

An android application with MP3 functions
Wirelessly control the MP3 player using the android application
MP3 features: play, pause, resume, stop, fast forward, volume control, etc.

Team Members and Responsibilities

Anthony Hu
- Android application that allows communication with MP3 board using TCP
Ricky Nguyen
- Implement wifi module with MP3 board by interfacing UART driver

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.

Week	Planned Tasks	Status
1	Order parts Download and install software Get familiarized with software tools	Completed Completed Completed
2	Look over datasheet(s) Test parts Interface UART with wifi module Begin Android app design	Completed Completed Completed Completed
3	Setup Wifi Module in Adhoc Mode Communicate with Wifi Module through Hercules Change MP3 controls from Switches to UART Control MP3 functions using Hercules Android communicate through TCP	Completed Completed Completed Completed Completed
4	Connected Wifi Module to Home Network Connect Android to wifi module Send Android commands to MP3 through wifi module	Completed Completed Completed
5	Testing Project report	In Progress In Progress
6	Finalize project Finalize report

Parts List & Cost

Give a simple list of the cost of your project broken down by components. Do not write long stories here.

Parts	Cost
LPC2148 Microcontroller	$60
RN-XV WiFly Module	$35
Netgear N300 Wireless Router	$45

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.

Hardware Design

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

To power the wifi module, it requires an average 3.3V to operate and can take a maximum voltage of 3.7V and a minimum voltage of 3.0V. The power pin from the LPC2148 supply a steady 3.3V and can be used to power the wifi module. The wifi module can be connected to the LPC2148 through UART. This requires two pin from both component, Tx and Rx. The following table show the pin connections.

LPC	Wifi
P0.8 (TXD1)	P3 (UART_RX)
P0.9 (RXD1)	P2 (UART_TX)
3.3V Pin	P1 (VDD_3V3)
GND Pin	P10 (GND)

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.

The hardware involved in this project are the LPC2148 microcontroller, RN-XV WiFly Module, SD Card, MP3 Decoder, and DAC. The LPC2148 is connected to the SD Card through SPI and connectd to MP3 Decoder and DAC through I2C. In previous lab assignments, the drivers for SPI and I2C were created for these connections. The MP3 project was extended to include wireless communication to an Android Device. Wireless communication is established by interfacing the LPC2148 to the RN-XV WiFly Module through UART. LPC2148 have two UART port and UART0 is already used. Therefore, the WiFly module is connected through UART1. To use UART1, a driver must be created for it. The UART1 driver was created base off the UART0 driver. Minor changes were made to address UART1 registers. The figure below shows the buses being used.

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.

The tasks that are being used for the MP3 player are uartUI and mp3task. The uartUI read the commands from the WiFly module. The commands are then processed and controls are sent to the mp3task. The psuedocode for the uartUI can be seen below. The mp3task was created in a previous lab assignment.

char uart1Input[];
for(;;)
{
 uart1getchar(uart1Input)
 if(“play”)
	send song to mp3task
 else if(“pause”)
	pause song
 else if(“resume”)
	resume song
 else if(“stop”)
	stop song
 else if(“start”)
	start song
 else if(“volume up”)
	increase volume
 else if(“volume down”)
	decrease volume
 else if(“playlist”)
	uart1putchar(songname);	//send playlist
}

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.

To communicate with the WiFly module and have the LPC2148 read the commands, the WiFly module must be connected to the same network as the sending device and the device must connect to the WiFly module. When data is sent to the WiFly module, the module echoes the data through UART, then the LPC2148 just needs to be reading to receive the data. The steps are listed below: <br\> 1. Connect WiFly Module to network<br\> 2. Connect device to the same network<br\> 3. Connect device to WiFly Module<br\> 4. Have LPC2148 reading from UART port<br\> 5. Sent data from device<br\> 6. WiFly Module echoes data through UART<br\> 7. LPC2148 should receive the data<br\>

Testing & Technical Challenges

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:

Wifi Connection Issues

Many wifi connection issues were encountered. To solve this problem, a dedicated task was created to re-connect to wifi if the connection was ever lost.

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

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Project Source Code

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References

Acknowledgement

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

References Used

List any references used in project.

Appendix

You can list the references you used.