Intelligent%20Machines%20Design%20Laboratory

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• Intelligent Machines Design Laboratory
• Sensor Presentation (4/18/06)
• Alarm-o-bot
• Andrew Joseph
• TAs Adam Barnett
• Sara Keen
• Instructor A. Arroyo

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Problem

• Have you ever had trouble waking up in the
  morning?
• Do you hit the snooze button in a daze and just
  kept right on sleeping.
• Does this cause you to miss tests, classes, or
  assignment turnin days?

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Solution Alarm-o-Bot

• Hides itself based on low light intensity and
  distance parameters.
• Avoids obstacles in the way.
• The snooze button must be hit on the Alarm-o-bot
  to stop alarm.
• Alarm-o-bot continues to hide itself after each
  successive snooze.

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Sensors Types

• Bump switch act as snooze button for users to
  hit
• CDS sensor detect light variance (find darkest
  place in room)
• IR sensor obstacle avoidance
• RF TX/RX pair communicate between clock and
  moving robot

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IR Sensors

• ADC values range from 500 (about 2.4V - close)
  to about 50 (about 0.4V - far).
• Distance measurements viable from 10cm to 80cm

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CDS Sensors

• Low resistance in high light, high resistance in
  low light
• Voltage divider with 10k resistor provides
  voltage range from 0V to 5V
• Sensor with highest voltage points to darkest
  area in room

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RF Transmitter/Receiver
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RF Transmitter/Receiver

• 2400 bps baud rate
• Operates at 315Mhz
• -103dbm sensitivity that pulls 3.5mA for 5V
  operation
• 10cm wire antenna used for receiver
• Encoding scheme for transmission through noisy
  environment

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Conclusion
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Questions?