QUESTION 1: A burglar alarm system uses pressure sensors and acoustic (sound) sensors to detect the presence of an intruder. A microprocessor is used to monitor and control the whole system. A keypad is used to key in a 4-digit PIN that either activates or deactivates the system.
If an intruder is detected, an alarm is sounded and also a blue flashing light outside the building.
Descrive in detail how the sensors and microprocessor interact to detect and warn of an intruder.
QUESTION 2:
Four hardware items are shown below.
For each hardware item:
• name a suitable application
• state how it is used in the application
Give a different application in each case.
1. Barcode reader
2. Microphone
3. Touch screen
4. Infrared sensor