Summary of Wireless Electronic Notice Board using GSM
This project implements a wireless electronic notice board using an SST89E516RD-40-C-PIE microcontroller and a GSM module to receive messages from a mobile phone and display them on a 16x2 LCD via UART (9600 baud) and a MAX232 level shifter, enabling flexible installation in public places without wired connections.
Parts used in the Wireless Electronic Notice Board:
- SST89E516RD-40-C-PIE microcontroller
- GSM module (GSM modem)
- MAX232 level converter IC
- 16x2 LCD display
- Power supply (regulated)
- Interfacing cables and connectors for UART/RS232
- PCB or breadboard and supporting passive components (wires, resistors, etc.)
This project demonstrates how to design a wireless electronic notice board using SST89E516RD-40-C-PIE microcontroller. The notice boards are important in public places like railway stations, parks and airports. Presently almost all electronic notice boards are designed using wired system. One of the drawbacks of the design is the system’s flexibility in terms of placement. The aim of this project is to develop a wireless notice board that can be installed in any public areas and will display the latest information sent from the user’s mobile.
The above circuit consists of Microchip Technology’s SST89E516RD-40-C-PIE microcontroller, GSM module, level converter and 16×2 LCD. The LCD is connected to P1.0 and it is used to display message. The GSM module is connected to the SST89E516RD-40-C-PIE microcontroller through the MAX232 IC. Only four data lines are required to display the data, which are connected to P1.4, P1.5, P1.6 and P1.7 respectively. In order to communicate with GSM, some AT commands are sent through the serial connection (UART Protocol). The module requires 9600-baud rate. The GSM modem is duly interfaced through level shifter IC for establishing RS232 communication protocol to the microcontroller. The message received is sent to the microcontroller that further displays it on electronic notice board, which is equipped with a LCD display. It is interfaced to a microcontroller from 8051 family duly powered by a regulated power supply.
For mor detail: Wireless Electronic Notice Board using GSM
- What microcontroller is used in this wireless notice board project?
The SST89E516RD-40-C-PIE microcontroller is used in this project. - How does the notice board receive messages?
Messages are received via a GSM module which sends received text to the microcontroller over serial connection. - What communication protocol is used between the GSM module and microcontroller?
The communication uses UART serial protocol with AT commands at 9600 baud. - How is RS232 level conversion handled?
RS232 communication is established through a MAX232 level shifter IC between the GSM module and microcontroller. - Which pins of the microcontroller connect to the LCD?
The LCD data lines use P1.4, P1.5, P1.6 and P1.7; the LCD is connected to P1.0 as described. - How many data lines are required to display data on the LCD?
Only four data lines are required to display the data on the LCD. - What baud rate does the GSM module require?
The GSM module requires a 9600-baud rate. - What powers the notice board system?
The system is powered by a regulated power supply.
