The
main aim of this project is to display time or fares on the display board
whenever the owner wishes to. This can be mostly seen in gold rates display in
jeweller shops. The variations in the gold price can be seen daily. So the
owner needs to change the previous value and update with the new value. Most of
the gold shop owners do it by writing on the black board arranged in their
shops. They can avoid this by sitting at their present place using wireless
concept, IR.
Seven
segment displays are used in this project as the display units. IR remote acts
as the transmitter in this project. When a button is pressed in the remote, the
signal will be passed and received by the IR receiver TSOP Receiver. This
signal is sent to the microcontroller which decodes the signal and displays the
corresponding number pressed in the remote.
For example, if number 1 is pressed
in the remote, the microcontroller displays 1 on the seven segment display.
The
IR receiver will be interfaced with the microcontroller on its external
hardware interrupt pin. The microcontroller continuously monitors the IR
receiver output, decodes the received value and sends this value to the seven
segment display and finally the value is displayed. The owner can change the
value any time he wishes to.
This
system also works as a watch and displays the time, date on seven segment
display. Real Time Clock is used for this purpose. RTC DS1307 is interfaced to
the microcontroller for real timing performance. A 3V battery can be connected
to DS1307 to avoid time disturbances caused by power failures. The user can
even change the preprogrammed timings and set the timings according to his
requirements.