user interrupt for all quastions

microcontroller 8051

what data do you need ??

2. Design an intrusion warning-system using interrupts that sounds a 400 Hz tone for 1 second (using loudspeaker connected to P1.7) whenever a door sensor connected to P3.2 makes a high-to-low transition. 3. Write a program using interrupts that simultaneously create 10 KHz and 100 Hz square waves on P1.1 and P2.2. 4. Use interrupt to design a device that will read a scanner connected to it serially, and save the characters in a file. When the scanner is not used, the user of this device can print the information stored in the file on to a printer connected serially to this device. The user can chose whether she wants to scan a file or print the information already scanned. Use 19,200 baud rate. 5. Using interrupts, design an 8051 Heating/Cooling control system that keeps a building at 20 degree Celsius +1 or -1