23-03-2017, 10:19 AM
Bulletin board is the primary thing in any utility institution / organization or public places like bus stations, railway stations and parks. However, pasting up multiple day-to-day ads is a difficult process. A wireless bulletin board showing messages sent from the user's mobile. When a user sends a message from his mobile phone, he is received by a GSM modem loaded with SIM in the receiving unit.
The GSM modem is properly interconnected via the level shifter IC to establish the RS232 communication protocol with the microcontroller. The message thus received is thus sent to the microcontroller which also shows it on the electronic bulletin board which is equipped with an LCD screen connected to a microcontroller of the family 8051 duly powered by a regulated power supply of the mains of 230 volts Ac. It can also be expanded to a larger LCD screen.
