Coin Operated Fortune
Telling System with Dancing LED Effect
Title of the project : AT89S52 Microcontroller based Coin Operated
Fortune Telling System with Dancing LED
Effect.
Domain : Embedded Systems Design
Software : Embedded C, Keil, Proload
Microcontroller : AT89S52
Power Supply : +5V,
500mA Regulated Power Supply
Display : a)
LCD
b)
LED
LCD : HD44780 16-character, 2-line (16X2)
LED : 5mm White-in-Red, 5mm White-in-Blue
Input : LDR-LED for sensing coin insertion
ABSTRACT:
The
Project 89S52 Microcontroller based Coin Operated Fortune Telling System with
Dancing LED Effect is an interesting project which uses 89S52 microcontroller
as its brain. It uses a Light Dependant Resistor (LDR) for sensing the coin
insertion. LED-LDR arrangement is made in the coin box so that the light of LED
directly falls on the LDR. If a coin is inserted in the coin box assembly the
light falling on the LED is interrupted. This interrupt signal is sensed by the
LDR and an NPN transistor sends a low signal to the microcontroller. By sensing
the low signal the 16X2 LCD displays a fortune message which is already
preprogrammed in the microcontroller.
The
89S52 microcontroller contains four ports of each eight pins. In this project
two ports are dedicated for LEDs to generate dancing light effect. 16 LEDs are
connected with different colour light emissions. A simple yet powerful program
is written in assembly language to generate different lighting effects.
READY
LED is provided to indicate the status of the microcontroller whether it is
ready to accept the coin or not. If the LED is glowing means the system is
ready to accept the coin.
A
buzzer is provided for audio effect of the coin insertion. Whenever a coin is
inserted in the coin box, the system acknowledges the coin reception by a short
beep sound. This buzzer is driven by an NPN transistor.
This
project uses regulated 5V, 500mA power supply. 7805 three terminal voltage
regulator is used for voltage regulation. Bridge type full wave rectifier is
used to rectify the ac out put of secondary of 230/12V step down transformer.
BLOCK
DIAGRAM
No comments:
Post a Comment