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Tyrenny Hidy and Derek Russell
EENG 383 – November 21, 2014
This project has the following functions:
*Alarm is along the inside of a door with a break beam
sensor.
*When the beam is broken, an alarm sounds.
*The user enters the code on the keypad, and the LEDs light
up as each number is pressed.
*If the code is correct, a fifth LED lights up, and a victory
song is played.
*Additional challenge given to us: Determine the optimum
distance for use of the break beam sensor
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This project requires the use of:
*HCS12 Microcontroller board
*Break Beam Sensor System with IR receiver
and IR transmitter
*Keypad
*LEDs
*Additional protoboard
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Pseudocode: Very basic premise of the design
Use delayusec code for song playing.
Initialize PT0 – PT3 as inputs, PT4 – PT6 as outputs (from
keypad), PT7 is an input from IR receiver
Initialize PM0-PM5 as outputs. PM4 is tied to the speaker;
PM0, PM1, PM2, PM3 and PM5 are LEDs.
If beam breaks, play alarm sound.
Keypad used to stop alarm sound.
If all four characters are correct, light green LED, play
victory song.
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The team was asked by Dr. Hoff to investigate
the challenges the class had with the break
beam sensor.
Possible reasons and solutions for the challenges:
Oversaturation of the signal.
The frequency is incorrect.
The sensor was being held much too close.
Move the sensor further away.
What is the minimum distance?
What is the maximum distance?
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