Circuit design and Xbee demonstration.

1. Xbee Wireless Throttle Position Sensor and Control Presenters: Miquel Moe and Eleanya Onuma Mentor: Professor Anderson Department of Electrical Engineering

2. Agenda Introduction Equipment Procedure Results Conclusion Acknowledgements

3. Introduction Our goals in this design: -Build a throttle position sensor prototype -Control the throttle of the throttle position sensor wirelessly -Implement a temperature sensor that will monitor the temperature of the throttle for safety

4. Introduction What is a throttle? -Regulates the flow of fluid and/or air -This regulation is maintained by position of the flap What is a throttle position sensor? -Monitors the position of the throttle -Has an associated output (resistance, voltage…) with every position

5. Throttle Position Sensor ADC 0804 IC chip 0.1uf, 10uf and 147pf Capacitors 10k Ω Potentiometer E3630A Agilent Triple Output Power Supply 741 op amp Switch 7 Segment Display Wires EPROM SN74LS47

6. Procedure Design specification for the Throttle Position Sensor

7. Vout

10. Graph

11. Microprocessor-Compatible 8-bit A/D Converter (ADC0804LCN) Vout from Diff op amp

12. Test DAC input and output :

13. ADC EPROM SN74LS47 7- Segment Display

14. Throttle Design and control 10k potentiometer Cylindrical container(oatmeal box) Pen Epoxy Electric tape Wires 5volts Unipolar Stepper motor Darlington transistor.

15. Pictures of the Throttle

16. Stepper motor A stepper motor as the name suggests is an electric motor that can divide a full rotation into a number of steps. 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.

17. Unipolar stepper motor specification. 35L048B1U-N Counter-clockwise Rotation Clockwise Rotation

18. Arduino Arduino is an open-source electronic prototyping platform. The Atmega microcontroller on the board is programmed using Arduino Programming language which is based on C/C++ We programmed the MCU to control our stepper motor using serial input sent through a Xbee radio

19. Xbee(Zigbee) Xbee is a low power, wireless mesh networking standard. Mesh networking is a method of routing data between nodes in a network.

21. Upgrade firmware

23. Thermal resistor also known as a thermistor is a resistor whose resistance vary with temperature. Steinhart-Hart equation is used to model the resistance on the thermistor at different temperatures. Where A, B C are Stienhart-Hart coefficient and vary by from type and model of thermistor T = Temperature in Kelvin R = Resistance in ohms at different Temperature

24. Wire Up the Circuit

26. System shut down Comparator – compares two voltages Buffer amplifier

28. Throttle and throttle Position Sensor(degree error due to design)7.5˚ 5.5˚