moving message display

Posted on Feb 5, 2014

You can make an LCD show a brief moving message by interfacing it to a microcontroller. Here`s an AVR-based moving-message display that uses a 16G—2 LCD display incorporating HD44780. The 16G—2 LCD can display 16 characters per line and there are two such lines. Fig. 1 shows the circuit for AVR ATmega16-based moving-message display on an LCD.

moving message display
Click here to download the full size of the above Circuit.

It consists of an ATmega16 microcontroller, a 16G—2 LCD, an SPI6 connector and a power supply section. To derive the power supply for the circuit, 230V AC mains is stepped down by a 9V, 250mA secondary transformer, rectified by bridge rectifier module BR1A and filtered by capacitor C1. The voltage is regulated by a 7805 regulator. LED1 glows to indicate the presence of power in the circuit. The regulated 5V DC powers the entire circuit including SPI6 connector. Port-C pins PC4 through PC7 of the microcontroller (IC2) are connected to data lines D4 through D7 of the LCD. The LCD control lines ”read/write (R/W), register-select (RS) and enable (E) ”are connected to PD6, PC2 and PC3 of IC2, respectively. Why AVR microcontroller AVR is faster and more powerful than 8051 microcontroller, yet reasonably cheaper and in-circuit programmable. Most AVR development software are free as these are Open Source. Moreover, discussions and tutorials on the AVR family of processors are available on the Internet. ATmega16 is a high-performance, low-power 8-bit AVR microcontroller. It has 16 kB of in-system self-programmable flash, 1 kB of internal SRAM, 512 bytes of EEPROM, 32G—8 general-purpose working registers and JTAG Interface (which supports programming of flash, EEPROM, fuse and lock bits). The project uses a Hitachi HD44780-controlled LCD module. The HD44780 controller requires three control lines and four or eight input/output (I/O)...

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