REMOTE CONTROLLED DIGITAL CLOCK OR FARES DISPLAY USING IR
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.
External EPROM is used to store the data. Data stored remains in the memory even after power failure, as the memory ensures reading of the latest saved settings by the micro controller. It can retain data for more than ten years.