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Bi-Directional RF Data Communication

Bi-Directional RF Data Communication. A Robot Control Device Team BDRFC. Team BDRFC Members. Matthew Merican – Team Leader Varun Jain – Assistant Leader Andrew Gibbons - Secretary Trevor Damyan - Treasurer Noel Smith – Document Coordinator. Matthew Merican. Summary of Presentation.

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Bi-Directional RF Data Communication

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  1. Bi-Directional RF Data Communication A Robot Control Device Team BDRFC

  2. Team BDRFC Members • Matthew Merican – Team Leader • Varun Jain – Assistant Leader • Andrew Gibbons - Secretary • Trevor Damyan - Treasurer • Noel Smith – Document Coordinator Matthew Merican

  3. Summary of Presentation • Problem Statement • Requirements • Applications and Benefits • High Level Design • Detailed Design • Transceiver • Interface • Testing Hardware and Software • Changes • Schedule and Current Status • Costs Matthew Merican

  4. Problem Statement Sophomore level design courses frequently build robots that require wireless control capability. Professor Hatfield has requested that a simple, stand alone device be built that will ease the use of wireless communication between robot and computer. This device must meet the requirements discussed in this presentation. Matthew Merican

  5. Technical Requirements • Wireless RS232 communication device that communicates over a range of 100 feet with a baud rate of at least 2.4 Kbits/second. • Needs to use the standard com port on a computer to communicate with the transceivers. • We need four independent communication channels so that four robots can be controlled at the same time. • No licensing required for the use of this product. Matthew Merican

  6. Packaging Requirements • Dimensions: 2” x 2” x 0.5” maximum • Weight: 4 oz. • Operating Temperature: 10° to 30° C • Should be able to withstand a drop of 3 ft. • Water resistant. Noel Smith

  7. Testing Requirements • Testing software to ensure proper transceiver function. • Testing to prevent cross communication between robots. • Product will be tested to verify range of 100 ft. • Test for shock resistance of 3 ft. drop. • Test to ensure water resistance.

  8. Applications • Wireless data capture for device – computer interfaces. • Network two computers over a wireless serial cable. • Remote sensing, decreases environmental impact and eases deployment. • Control embedded systems remotely. • Home security system.

  9. Benefits • Easier mobility for sophomore level student projects. • External serial interface for easy connection to computers and controller boards. • Inexpensive - more units can be easily produced for additional applications. • Expandable - range and power can be increased for additional possibilities.

  10. High Level Design • The communication device utilizes a pair of 900MHz transceivers for wireless serial communication. • The transceiver needs to interface with a serial port on the computer or controller board. • Signal may need to be filtered to prevent error during transmission. • Voltage levels may need to be converted to interface with transceivers. • Sockets used to easily replace components. Trevor Damyan

  11. Detailed Level Design • Transceiver • Interface • Serial port • Voltage level conversions • Filter (may not be needed) • Testing Hardware and Software • Layout • Software • Packaging

  12. Transceiver • Aerocomm 900 MHz transceiver (www.aerocomm.com). • Programs by grounding a pin and writing with a serial port. • Half and full duplex capability. Andrew Gibbons

  13. Serial Port Interface Andrew Gibbons

  14. Voltage Conversions • Serial port: ±15V where -15V = 1, +15V = 0. • Transceiver: 0 – 5 V. • Need to be able to switch between levels for interfacing. • Need to use a simple power supply such as a 9V battery. Andrew Gibbons

  15. Hardware Testing • Interface circuits will be tested before final assembly to ensure proper voltage and current levels. • Testing will occur before and after assembly. • Hardware will be tested using software for programming and compatibility.

  16. Software Testing • Test program using Labview 6.1.

  17. Packaging Design • Water Resistance • Shock absorption • Size

  18. Parts Selected • Four 900 MHz transceivers and antennas ordered from aerocomm.com (allows for cross communication testing). • Maxim max232 RS232 driver/receiver to handle voltage conversions. • Labview 6.1.

  19. Schedule Varun Jain

  20. Current Status • Design selected. • Derived Link Capabilities • Determined which transceiver to use. • Parts ordered. • Test software created and tested using null modem cable.

  21. Planned Activity • Schematics • Transceiver, power amplifiers, filter designs • Top-level circuit • Testing and Simulation • Testing using serial data sent from one computer to another over the link. • Packaging Design and Assembly • User’s Manual Varun Jain

  22. Original Budget Varun Jain

  23. Current Budget Total per set $175.00

  24. Budget • Budget Goal: $200 per transceiver set • Off-the-shelf parts used for easy replacement • Actual costs were lower than expected • Major purchases have been made by client Varun Jain

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