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Electronics Board HC12 EEL4744 board –CPLD –8k EEPROM –Serial port –4 PWM channels –8 A/D ports –8 Input capture/Output compare ports 24k RAM memory(*) 1 LED output port Output port connected to dual 7-segment display Low battery indicator (*) Not all of it works
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S.T.E.V.E.(Speed Trap Enforcement VehiclE)
Final PresentationMichael Hattermann
April 16, 2002
Description1. Wait for a speeding car2. Chase after (follow) the speeding car3. Pull over the speeding car
Electronics Board• HC12 EEL4744 board
– CPLD– 8k EEPROM– Serial port– 4 PWM channels– 8 A/D ports– 8 Input capture/Output compare ports
• 24k RAM memory(*)• 1 LED output port• Output port connected to dual 7-segment display• Low battery indicator
(*) Not all of it works
Platform
Platform Design Goals• Big enough to hold
electronics board• Look like a cop car
Actuation• 2 DC gear head motors• Motor Driver
– National LMD18200 H-bridge– Optically isolated from electronics board
Obstacle AvoidanceSensors• Sharp GP2D12 Analog IR detectors (40 kHz)• Bump switches
Features• Smooth motor
control• Veer from distant
objects• Randomness
Object Following
Features• >180° field
of vision• Object
avoidance when lost
• Speed control algorithm
Sensors• Hacked LiteOn IR detectors (56kHz)
Speed DetectionSensor• Laser break-beam system• LiteOn digital IR receivers (56kHz)
Features• Similar to real
speed trap• Know direction
of passing object
Conclusion
• HC12 good, 4744 board bad• DC motors worth the effort• Need to integrate subsystems
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