Anti-theft Device

Create and demonstrate an anti-theft warning circuit that:
• Illuminates green LED if there is no input to light, sound and touch sensors
• Illuminates yellow LED if one of the light, sound and touch sensors receives input
• Illuminates red LED if two of the light, sound and touch sensors receive input
• Sound an alarm (using a circuit created by students) if all three sensors (the light, sound and touch) receive input

Essential Questions
• What is a sensor?
• What is digital logic
• How are digital processors designed?

Students will be able to answer the following questions:
1. How many possible outputs are there for n-digital inputs?
2. What is a “don’t care” condition?
3. How do the OR, AND & Inverter gates work?

Students should be able to:
• Design and build a circuit that triggers outputs based upon combinations of sensor inputs.

Students will know:
• How to calculate a binary number
• How logic gates function
• That no voltage is not the same as:
  a. The low voltage value
  b. Zero
  c. Negative battery terminal
  d. Ground
• How to build a circuit
• How a simulator can assist an electrical engineer