CSC400-Wireless Networking

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Student: Vilma Reyes
Adviser: Dominique Thiebaut (Paul Voss also supervises a complementary Independent Study performed in parallel with this one.)


Existing pH-monitoring devices have sounding alarms as the main alerting system in order to inform diabetic patients when their pH level is in a critical state. However, diabetic patients can enter a state of coma if their body pH goes out of the healthy range (7.35 - 7.45). Therefore, a sounding alarm could prove to be useless. Especially, for college students or other diabetic patients that may live alone.


For the course of a semester, I plan on working with existing technology to learn how to send an SMS or any other wireless signal. The new knowledge that I gain from working with Arduinos and learning how to transmit data over a wireless network will allow me to figure out a way to improve my current design clinic project - designing a less-invasive pH monitoring device. At the end of the semester, I hope to be able to transmit data on a wireless network from an Arduino or a microcontroller.


  • Possible programs:
  • Python
  • Sending data from the microcontroller to a pc
  • Sending an e-mail
  • Sending an SMS

XBee Testing

See this page for a communication test of XBee modules with an Arduino and a Mac.

Final Testing

  • Propeller Program
  • Code Description
The following code, written for a P8x32A-M44 Parallax microcontroller, prints the string "Hello Word__" by communicating wirelessly between two Xbees. The code specifies which pins are being used on the microcontroller to transmit and receive information and establishes a Baude rate. The last portion of the code encodes the transmitting XBee to send a string and to add a delay in between each transmission. An image of the set up is included below.
  • Code
NOTE: Must use Windows to run code with the propeller Spin tool

  _clkmode = xtal1 + pll16x
  _xinfreq = 5_000_000
  XB_Rx = 17 ' XBee DOUT                            ' Set pins and Baud rate for XBee comms
  XB_Tx = 16 ' XBee DIN
  XB_Baud = 19200

  long stack[50]                                    ' stack space for second cog

  XB : "FullDuplexSerial"
Pub Start
  XB.start(XB_Rx, XB_Tx, XB_Baud)                   ' Initialize comms for XBee

    XB.str(string("Hello World__"))                 ' Accept data from PC and send to XBee  
    waitcnt(clkfreq/2 + cnt)                        ' Wait a moment  

  • Images
  • Circuit Blog diagram
Circuit Block Diagram-1.jpg
  • Picture of the final circuit
  • Serial Communication with a Mac
  • Step-by-step set up
    • Set up for the Mac Terminal to communicate with the Xbee:
      • Plug in Xbee base into USB port
      • Open Terminal (search in Finder)
      • Type "Is /devitty.*" into the Terminal window
      • Terminal will display all devices that are plugged in for serial communication. Take note of the Xbee. It will look something like this: "/dev/tty.usbserial-########" with an alphanumeric number at the end.
      • In order to begin communication with the Xbee, run this command in Terminal: "screen /dev/tty.usbserial-1414###### 19200" *Note that 19200 is the baud rate and can be changed as needed.
      • A window will pop up. Now, you're all set for talking to Xbee!
      • To finish communicating, press "control-A" and then "control-\"