Xbee Wireless Throttle Position Sensor And Control


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Circuit design and Xbee demonstration.

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Xbee Wireless Throttle Position Sensor And Control

  1. 1. Xbee Wireless Throttle Position Sensor and Control<br />Presenters: Miquel Moe and Eleanya Onuma<br />Mentor: Professor Anderson<br />Department of Electrical Engineering<br />
  2. 2. Agenda<br />Introduction<br />Equipment<br />Procedure<br />Results<br />Conclusion<br />Acknowledgements<br />
  3. 3. Introduction<br /> Our goals in this design:<br /> -Build a throttle position sensor prototype<br /> -Control the throttle of the throttle position sensor wirelessly<br /> -Implement a temperature sensor that will monitor the temperature of the throttle for safety<br />
  4. 4. Introduction<br />What is a throttle?<br /> -Regulates the flow of fluid and/or air <br /> -This regulation is maintained by position of the flap<br /> What is a throttle position sensor?<br /> -Monitors the position of the throttle <br /> -Has an associated output (resistance, voltage…) with every position<br />
  5. 5. Throttle Position Sensor<br />ADC 0804 IC chip<br />0.1uf, 10uf and 147pf Capacitors<br />10k Ω Potentiometer<br />E3630A Agilent Triple Output Power Supply<br />741 op amp<br />Switch <br />7 Segment Display<br />Wires<br />EPROM<br />SN74LS47<br />
  6. 6. Procedure<br />Design specification for the Throttle Position <br /> Sensor<br />
  7. 7. Vout<br />
  8. 8.
  9. 9.
  10. 10. Graph<br />
  11. 11. Microprocessor-Compatible 8-bit A/D Converter (ADC0804LCN)<br />Vout from Diff op amp<br />
  12. 12. Test DAC input and output :<br />
  13. 13. ADC<br />EPROM<br />SN74LS47<br />7- Segment Display<br />
  14. 14. Throttle Design and control<br />10k potentiometer<br />Cylindrical container(oatmeal box)<br />Pen <br />Epoxy<br />Electric tape<br />Wires<br />5volts Unipolar Stepper motor<br />Darlington transistor.<br />
  15. 15. Pictures of the Throttle<br />
  16. 16. Stepper motor<br />A stepper motor as the name suggests is an electric motor that can divide a full rotation into a number of steps.<br />Unlike the conventional DC motor that rotates whenever voltage is applied across the terminal, a stepper motor is controlled using a stepper motor controller or a microcontroller following a unique sequence.<br />
  17. 17. Unipolar stepper motor specification.<br />35L048B1U-N<br />Counter-clockwise Rotation<br />Clockwise Rotation<br />
  18. 18. Arduino<br />Arduino is an open-source electronic prototyping platform.<br />The Atmega microcontroller on the board is programmed using Arduino Programming language which is based on C/C++<br />We programmed the MCU to control our stepper motor using serial input sent through a Xbee radio<br />
  19. 19. Xbee(Zigbee)<br />Xbee is a low power, wireless mesh networking standard. <br />Mesh networking is a method of routing data between nodes in a network.<br />
  20. 20. Configuring the Xbee radios<br />DATA<br />Arduino A<br />Xbee A<br />Sender<br />Xbee C<br />Receiver<br />Arduino C<br /> - -<br />X-CTU software<br /><ul><li> Set baud rate for Xbee radios
  21. 21. Upgrade firmware
  22. 22. Test Range</li></li></ul><li>Program the Arduino <br />Arduino A<br />Arduino C<br /><ul><li>Wire Circuit</li></li></ul><li>Temperature Sensor<br />Equipments<br />10k Thermistor<br />10kΩ Resistor<br />LCD( Liquid Crystal Display)<br />10uf capacitor<br />Speaker<br />Wires<br />
  23. 23. Thermal resistor also known as a thermistor is a resistor whose resistance vary with temperature.<br />Steinhart-Hart equation is used to model the resistance on the thermistor at different temperatures.<br />Where A, B C are Stienhart-Hart coefficient and vary by from type and model of thermistor<br />T = Temperature in Kelvin<br />R = Resistance in ohms at different Temperature<br />
  24. 24. Wire Up the Circuit<br />
  25. 25. Program the Arduino<br /><ul><li>Program the Arduino using the Steinhart-Hart Equation and Coefficients</li></ul>Arduino C<br />
  26. 26. System shut down<br />Comparator – compares two voltages<br />Buffer amplifier<br />
  27. 27. RESULTS<br /><ul><li> Temperature readings
  28. 28. Throttle and throttle Position Sensor(degree error due to design)</li></ul>7.5˚<br />5.5˚<br />