Difference between revisions of "F12: Android Door Lock"

Revision as of 05:52, 10 December 2012

Android Door Lock

Abstract

Using a Wifi connection, our door lock can be locked and unlocked remotely with an Android device.

Introduction & Features

• UART communication between RN-XV WiFly Module and LPC2148 Microcontroller.
• Andriod application that enables wireless door access.
• WiFly module for wireless communication between Android and LPC2148 Microcontroller.
• TCP communication running on LPC2148 handling requests from the Android application.
• Web server to handle user permission, to set door codes, and to view time stamps of when the door was accessed.
• MP3 player that allows customizable tunes to play when the door is unlocked.
• Filing system that stores all the log times that the door has been accessed.
• Electronic door strike that unlocks when door code is recognized.

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Team Members & Responsibilities

• Rosemary Chen
  • Created the UART1 driver that enables communication between the wireless module and the micro controller.
  • Created the Real Time Clock driver used for logging the time that users access the door.
  • Created the user interface for setting and configuring the wifly module as well as automating the default settings for network connection.
  • Created a task for
    • Correct password detection
    • Enabling the lock when password is detected
    • Logging the time when the door is accessed
    • Playing a tune when the door is unlocked.
• Cindy Li
  • Created the web server that allows the host to track door users, enable or disable users, and sets the door code.
  • Created the door lock driver circuit that supplies the required 8v
• Hai Wang
  • Create a TCP client Android application that allows connectivity between the wireless module (server) and the Android application (client). The application is responsible for sending the correct door code to the server in order for the door to unlock.

Schedule

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Parts List & Cost

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**Cost excludes shipping and handling

Design & Implementation

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Hardware Design

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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.

SPI BUS

The LPC2148 Micro-controller communicates with the SD Card and the MP3 Decoder through the SPI bus. For both the SD Card and the MP3 Decoder, the chip select is transmitted through the SPI bus. For the decoder, data request and reset is also transmitted through SPI. The SD Card transmits MP3 data into the MP3 decoder. Once the decoder is done processing this data, it is then outputted into the I2C bus to the DAC.

I2C BUS

The LPC2148 Micro-controller communicates with the DAC and the MP3 Decoder using the I2C bus. The MP3 decoded data is outputted into the DAC so that it can convert digital signals into analog signals. The analog signals will be the sound produced out of our head phones which is connected to the audio jack. The micro controller can also send signals via I2C to the DAC to control volume, bass, treble, etc.

UART BUS

The uart bus allows communication between the LPC2148 micro-controller and the laptop as well as the WiFly module with the LPC2148. For the LPC2148, there are only two UART pins. In this case, UART0 is the connection between the computer and the micro-controller and UART1 is the connection between the micro-controller and the WiFly module. For the programmer to communicate with the WiFly module, the programmer would first have to send data to the LPC2148 micro-contoller through UART0, then redirect the data to the Wifly module using UART1. Once the WiFLy has received the data which may contain commands, the WiFly will respond by transmitting the requested data back to the LPC2148 via UART1 and from the LPC2148 back to the computer via UART0 so that the programmer can view the data that the Wifly transmitted.

GPIO PORT

The GPIO port is used to enable or disable the door lock. When the LPC2148 micro-controller recognizes a key code that is sent from the Android, it will send 5v through the GPIO which is connected to the door lock circuit.

Door Lock Circuit

The 5v supplied by the LPC2148 from the GPIO port is not sufficient to power the door lock so a small circuit was made to supply 8v to the door lock.

Software Design

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User Interface Task

All kinds of initialization takes place at the beginning of this task such as SPI, I2C, SDCard, MP3 Decoder, DAC, Door Lock, RTC, and the WiFly. Besides initialization, the UI task allows the user to communicate with the WiFly module such as sending data through wifi and configuring the settings on the WiFly, to view the directory of the SDCard, to select MP3 files to be played from the SDCard, to view the current time on the LPC2148, and to read the logged time stamps from the SDCard.

WiFly Task

This task is responsible for outputting data to Hercules that's sent from the WiFly module, parsing the data, and recognizing key codes sent from the Android. When the door code matches, this task will enable the GPIO port (unlock the door), send a song name to the song queue (play a tune), and log the time that the GPIO is enabled (when the door has been accessed).

MP3 Task

This task is responsible for reading mp3 files from the SDCard to the MP3 Decoder.

Real Time Clock Task

This task is responsible for outputting the time every minute.

Implementation

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User Interface Task

Before the user is able to input any data, all drivers and all data buses should be initialized first. If something is not initialized and the user tries to access it, the micro-controller may output the wrong data or may not allow access. Therefore, initialization functions are called at the beginning of this task. Once all initializations are done, the task enters a for loop where the user can enter and choose specified commands. Under the "wifly" command, the user may talk to the WiFly module. This works by sending whatever the user inputs into UART1. UART1 is the communication link between LPC2148 and the WiFly module. In response to the user, the wifly will send something back via UART1 and then printed to screen via UART0. If the user enters "ls" the SDCard directory will be outputted using the FAT functions to retrieve information. The "play" command will ask the user to input the name of an mp3 file given that the user knows the file name in the SDCard. Once the user enters the mp3 file name, it is sent into a song queue. "Time" simply prints out the hour, minute, and seconds using the RTC variables specified in the LPC2148.h. "Read" will open the locktimes file in the SDCard and read out the time stamps that were logged. Similar to reading the mp3 file, it is done in a while loop.

WiFly Task

The user interface task will constantly check whether or not there is data sitting in the UART1 buffer. If there is, it will print it to screen through UART0. Because the buffer stores a chunk of data sent from WiFly, we designed this task to use a string compare with the buffer and the door code. To isolate the door code from the rest of the data in the buffer, a simple parser is made. To keep the buffer to a sizable amount the content in the buffer is printed to screen and emptied every time a '\n' or any specified character is detected. If the string compare matches, then a acknowledge message will be sent to both UART0 and UART1 to indicate that the door is open. In addition to the acknowledge message, the name of the tune is sent to the song queue by using osHandles and an enable function for the GPIO port will be called. The GPIO function sets the GPIO pin high for five seconds, and then disables it when five seconds are up allowing enough time for the user to open the door and enter before it locks.

MP3 Task

This task is responsible for reading mp3 files from the SDCard to the MP3 Decoder. To do this it loads the song name of the mp3 selected in the UI task from the song queue and opens the file. Once this mp3 file is opened in the SDCard, it reads the file from the SPI bus into the MP3 decoder. The reading is done in a while loop so that the file will continue to be read as long as there is data to be read. If it has reached the end of file, the while loop will break. When the file has been read, this task will close the file.

Real Time Clock Task

To implement the time stamp portion, I have the task constantly check the minute hand. If the minute hand is not the same as the previous minute then print out the time and update the previous minute to the current minute.

Testing & Technical Challenges

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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

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Project Video

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Project Source Code

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References

Acknowledgement

We'd like to thank:

Chris Cheng for helping us with UART1 that was much needed for the communication between the LPC2148 and Hercules.

Preet Kang for walking us through the our labs and our project the whole way.

References Used

• Android Developers Website: http://developer.android.com/index.html
• RN-XV Wireless Module User Manual: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Wireless/WiFi/WiFly-RN-XV-DS.pdf
• TO-98 : http://www.classiccmp.org/rtellason/transdata/2n3858.pdf

Appendix

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