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Ahmed Abdel-Fattah Jerry Chang (a.k.a. Fred) Derrick Culver Matt Zenthoefer

Smart Security Camera. Ahmed Abdel-Fattah Jerry Chang (a.k.a. Fred) Derrick Culver Matt Zenthoefer. Functional Block Diagram. Camera: CMUcam2. Camera Features. Track user defined color blobs Colors must be bright and distinct Track motion using frame differencing

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Ahmed Abdel-Fattah Jerry Chang (a.k.a. Fred) Derrick Culver Matt Zenthoefer

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  1. Smart Security Camera Ahmed Abdel-Fattah Jerry Chang (a.k.a. Fred) Derrick Culver Matt Zenthoefer

  2. Functional Block Diagram

  3. Camera: CMUcam2

  4. Camera Features • Track user defined color blobs • Colors must be bright and distinct • Track motion using frame differencing • Find the centroid of any tracking data • Black and white NTSC analog output

  5. More Features • Communication protocol was designed to accommodate slow processors • Up to 176 x 255 Resolution • NTSC requires OV7620 camera module • Input power goes through a 5V regulator

  6. Testing the Camera • Use PC to grab a frame from the camera • Focus the lens • Demo Mode • The camera tracks an object using two servos to adjust the pan and tilt of the the camera

  7. RS-232 Protocol • Interface to CPU through UART(16550) • Provide buffering (through FIFOs) • Interrupt outputs (no need of polling) • Read and write bytes • Handles stop, start, and parity bits

  8. Parts Needed • MAX232 chip (puts out RS232 voltages) • UART chip • Clock (1.8432 MHz)

  9. Schematic

  10. Power Supply • A power supply will be constructed in order to convert an input of 120VAC to outputs of 9VDC and 5VDC • 6:1 Transformer will be used to convert 120VAC to 20VAC • Full-Wave Rectifier Bridge will then be used to rectify the AC voltage • LM7809 Regulator • 9VDC • LM7805 Regulator • 5VDC

  11. Power Supply Design

  12. Reset Button • First component completed • Reset Button • The reset button was tested to check it functionality using a logic analyzer • Made sure RES went low-true

  13. Microprocessor Testing • Test processor’s read ability • After the reset button is pushed • Processor reads in first eight bytes from reset vector • Using a logic analyzer we will read the address on the address line and “FFFF” on the data line • Future Testing • Use DIP switch for processor to read logic values • Use LEDs to display data that the processor writes

  14. VHF Transmitter and RF Amp • Will be fed using the CMUcam2’s NTSC analog output • The analog NTSC signal will be AM modulated at the VHF picture carrier frequency of 175.25MHz • Design of the TV transmitter will use a transistor and tank circuit • The modulated output will go to a wideband op-amp • At least a 6MHz bandwidth to insure total transmission of NTSC signal

  15. VHF Transmitter

  16. Antenna • Yagi-Uda Antenna •  = 1.71m • Has reflector and director elements to increase gain and directivity • A transmission range of 5-10 meters is feasible

  17. Impedance Matching • VHF transmitter output impedance will be matched to the input impedance of the antenna • Several matching options: • Quarter wave transformer • Stub matching • Component matching • Most likely will use component matching because carrier frequency is low enough

  18. Schedule

  19. Questions?

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