The subject is: Smart Grid Please send the answer by typing ONLY. I don't want any handwritten. Q2-Write the applications of Demultiplexer circuits.?

Q3. A door sensor is connected to P0.5 pin, an LED to P1.5 pin and a buzzer to P2.5 pin. Write an 8051 C program to monitor the door sensor such that when it is opened, the LED will blink and the buzzer will sound every 500ms, otherwise, when the door is closed, both of the LED and buzzer will be OFF.

What do the following abbreviations stand for? a. SPST b. SPDT c. DPST d. DPDT e. NO f. NC

I have a wooden toy train that runs on wooden tracks. I would like to place two ESP-WROOM-32 Boards on top of the train. Broadcast communication (which involves radio frequency, not Wi-Fi) would help communicate about the train's lateness to five other wooden trains on the same track. Local communication would help communicate to the train station about the train's lateness. I would also need radio frequency Tx-Rx Modules for discharging and undergoing the signal, and repeaters just in case the signal loses power due to long-distance traveling. My wooden train should be automated. It should run at 4 inches per second, keep a minimum distance of 30 seconds away from the other wooden trains, and make a 17-second-long stop every 500 seconds. What's the procedure to connect the components? What's the Arduino code (C++) for this project?