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This project can be used a Digital clock. Also it has a facility
to set alarm. Liquid Crystal Display - LCD shows the clock. It shows date and
time. You can set the time using a 4 keys keypad. Microcontroller has an
internal clock which runs inside the controller. Buzzer is turned on at the
desired time periods.
INTRODUCTION
Electronic clocks have
predominately replaced the mechanical clocks. They are much reliable, accurate,
maintenance free and portable. In general, there are two kinds of electronic
clocks. They are analog clock and digital clock. But digital clocks are more
common and independent of external source. It would be needed the controlled
devices and implementation of software for microcontroller control system because
the hardware devices cannot do any desired task to execute. In this paper, the
microcontroller-based digital clock is constructed with ATMEL 8051 and its
software program is written with Assembly program language. Various types of
digital clocks and modules are available in the market nowadays but this clock
is different at least in the accurate time. To be controlling in
microcontroller is only the feature of the clock. The display will come on LCD
and give the specified time.
This is an improved version of
digital clock with LCD display. It has an extra feature to set the alarm in the
starting. On reset, the LCD prompts the user to set alarm. Only the hour and minute components can be
set by pressing the corresponding switches, repeatedly. These switches are made
active low and so they provide ground to the corresponding input pins of the
microcontroller AT89C51.
When the clock time becomes equal to the alarm time, a
message ‘Alarm’ is displayed on LCD and alarm pin of microcontroller goes high
for some duration. This pin can be connected to a buzzer to sound the alarm at
the pre-set time.
BLOCK
DIAGRAM
Fig. 1 Block Diagram of Microcontroller Based Digital Clock with Alarm
HARDWARE
REQUIREMENTS
The hardware requirements of the project will be
·
Power Supply
·
8051 series Microcontroller
·
Relay Driver IC
·
Relays
·
Lamp
·
Push Buttons
·
Transformer
·
Diodes
·
Voltage Regulator
·
Crystal
·
LEDS
·
Capacitors
·
Resistors
·
MAX232
·
Relay
·
Buzzer
SOFTWARE
REQUIREMENTS
The software requirements of the project will be
§ Keil
compiler
§ Languages:
Embedded C or Assembly
§ DUMPING SOFT WARE:
Using Micro controller flash Software we are
dumping our HEX Code into Micro Controller
ADVANTAGES
- User friendly
- Cost effective
APPLICATION
- Used in institutes
- In colleges
- In universities
- In industries
- In public garden
