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PRE-PROGRAMMED DIGITAL SCROLLING MESSAGE

Under the guidance of submitted by. PRE-PROGRAMMED DIGITAL SCROLLING MESSAGE. PROJECT OVERVIEW BLOCK DIAGRAM MICROCONTROLLER 8052 ALPHA NUMERIC KEYS 74LS138 BC557 SCHEMATIC & WORKING OF THE PROJECTS ADVANTAGES APPLICATIONS FUTURE SCOPE CONCLUSION. contents.

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PRE-PROGRAMMED DIGITAL SCROLLING MESSAGE

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  1. Under the guidance of submitted by PRE-PROGRAMMED DIGITAL SCROLLING MESSAGE

  2. PROJECT OVERVIEW • BLOCK DIAGRAM • MICROCONTROLLER 8052 • ALPHA NUMERIC KEYS • 74LS138 • BC557 • SCHEMATIC & WORKING OF THE PROJECTS • ADVANTAGES • APPLICATIONS • FUTURE SCOPE • CONCLUSION contents

  3. A DC voltage of 5V is drawn from power supply voltage regulator is fed to micro controller. • Here the circuit uses 16 segment alpha numeric displays to show 16 characters at a time. • More over, programming has been done in micro controller to make the characters move in a beautiful manner. • It displays 16 different messages to depict different occasions, which can be selected by the user through a DIP Switch. • Using of Alphanumeric displays for above purpose, programming burden is reduced and becomes highly cost effective. • This circuit is mainly used in areas like railway platforms,banks,hotels,nightclubs etc Project overview

  4. Block diagram

  5. It is a smaller computer Has on-chip RAM, ROM, I/O ports... Microcontroller CPU RAM ROM A single chip Serial COM Port I/O Port Microcontroller Timer

  6. 8K Bytes of In-System Programmable (ISP) Flash Memory • 4.0V to 5.5V Operating Range • Fully Static Operation: 0 Hz to 33 MHz • 256 x 8-bit Internal RAM • 32 Programmable I/O Lines • Three 16-bit Timer/Counters • Eight Interrupt Sources • Full Duplex UART Serial Channel Features of MC 8052

  7. Block diagram of MC External interrupts On-chip ROM for program code Timer/Counter Interrupt Control Timer 1 On-chip RAM Counter Inputs Timer 0 CPU Serial Port Bus Control 4 I/O Ports OSC P0 P1 P2 P3 TxD RxD Address/Data

  8. Pin out of 8052

  9. +5V Power on Reset circuit + 10 uF 31 EA/VPP X1 30 pF 19 11.0592 MHz 8.2 K X2 18 30 pF RST 9

  10. 74LS138 (3-TO-8 DECODER/DEMULTIPLEXER) • The 74LS138 are high-speed CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). • The 74LS138 decoders accept three binary weighted address inputs (A,B and C) and when enabled, provide 8 mutually exclusive active LOW outputs (Y0 to Y7). • This multiple enable function allows easy parallel expansion of the ‘138’ to a 1-of-32 (5 to 32 lines) decoder with just four ‘138’ ICs and one inverter. • The ‘138’ features three enable inputs: two active LOW (G2A and G2B) and one active HIGH (GL). Every output will be HIGH unless G2A and G2B are LOW and GL is HIGH.

  11. Features • Designed specifically for high speed: • Memory decoders • Data transmission systems • 74LS138 3-to-8-line decoders incorporates 3 enable inputs to simplify cascading and/or data reception • DM74LS139 contains two fully independent 2-4 line decoder/mulitiplexere lamped for high perform • Typical propagation delay (3 levels of logic) • 74LS138 21 ns • 74LS139 21 ns • Typical power dissipation • 74LS138 32 mW • 74LS139 34 mW Connection Diagrams

  12. Function Tables

  13. Alpha Numeric Display • Alphanumeric displays are designed for numeric indication on instruments, meters, home appliance, communication, computing equipment, and display panels. display available with different character heights

  14. Internal structure of a alpha numeric key • Connections of an Alpha Numeric Led display

  15. The BC557 transistor is an PNP Epitaxial Silicon Transistor • The BC557 transistor is a general-purpose transistor in small plastic packages. • It is used in general-purpose switching and amplification BC847/BC547 series 45 V, 100 mA PNP general-purpose transistors BC557 (PNP TRANSISTOR)

  16. The arrow in the PNP transistor symbol is on the emitter leg and points in the direction of the conventional current flow when the device is in forward active mode.

  17. Keil an ARM Company makes C compilers, macro assemblers, real-time kernels, debuggers, simulators, integrated environments, evaluation boards, and emulators for ARM7/ARM9/Cortex-M3, XC16x/C16x/ST10, 251, and 8051 MCU families. • Compilers are programs used to convert a High Level Language to object code. Desktop compilers produce an output object code for the underlying microprocessor, but not for other microprocessors. Software requirements

  18. i.e., the programs written in one of the HLL like ‘C’ will compile the code to run on the system for a particular processor like x86 (underlying microprocessor in the computer). • For example compilers for Dos platform is different from the Compilers for Unix platform  So if one wants to define a compiler then compiler is a program that translates source code into object code. Contd..

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