Debajyoti Mondal, West Bengal, India
Moving LED Display is very active application of digital electronics. The application of this device can be found everywhere. From name plate display to train number display this display is used. The power consumption is 70% less than primitive display.
The main advantage of using this display is the information displaying on the display can easily be change by changing the program in microcontroller. And also animation is possible during displaying the massage. This is undoubtedly acceptable in the high society. There is another advantage of this device i.e. less cost-effective. The LED used in this device is RED LED having wavelength 660nm. Hence the displaying massage can be seen from very high distance.
The materials has been used in this device is very easily available in the market. So the raw material availability creates no problem during device manufacture.
Reason for Choosing this Project:
· Core Field Application
· Components availability in the market.
· Chance to work with High level Sub-routine In microcontroller program.
· The Device has less power Consumption.
Moving LED display displays the information on the Display board written in any language moving from right to left in animated form. This Display consists of four Units.
· Power Supply Unit.
· Register Unit.
· Display Unit.
· Controller Unit.
Power Supply Unit: - This Unit consists three sections:
1) Transformer Section, 2) Rectifier Section, and 3) Regulator Section.
In Transformer Section a step-down transformer has been used to step-down voltage level from 240V to 12V (AC). The rating of the transformer is 12V,3A (36W). In Rectifier Section a bridge rectifier circuit has been used to convert 12V AC to 15V DC. Because all the components used in this circuit work at 5V DC. Diode 1N5408 has been used in this circuit to form bridge rectifier. Because this diode has the capability of handling high Current flow
In Regulator Section IC7805 has been used to regulate the Voltage level at 5V DC. This component has very high stabile voltage level output.