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  Find the centroid of any tracking data  Black and white NTSC analog output

 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 More Features

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

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

Parts Needed  MAX232 chip (puts out RS232 voltages)  UART chip  Clock ( MHz)

Schematic

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

Power Supply Design

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

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

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 MHz  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

VHF Transmitter

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

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

Schedule

Questions?