BCD to Seven Segment Decoder 4511

Working of BCD To 7 Segment Decoder using 4511 The 4511 BCD-to-seven segment latch/decoder/driver is constructed with complementary MOS (CMOS) enhancement mode devices and NPN bipolar output drivers in a single monolithic structure. The circuit provides the functions of a 4-bit storage latch, an 8421 BCD-to-seven segment decoder, and an output drive capability. Lamp test (LT), blanking (BI), and latch enable (LE) inputs are used to test the display, to turn-off or pulse modulate the brightness of the display, and to store a BCD code, respectively. It can be used with seven-segment light emitting diodes (LED), incandescent, fluorescent, gas discharge, or liquid crystal readouts either directly or indirectly. There are two important types of 7-segment LED display. In a common cathode display, the cathodes of all the LEDs are joined together and the individual segments are illuminated by HIGH voltages. In a common anode display, the anodes of all the LEDs are joined together and the individual segments are illuminated by connecting to a LOW voltage. The 4511 is designed to drive a common cathode display and won't work with a common anode display. BCD To 7 Segment Decoder using 4511 circuit First, to power the 4511 chip, we connect VDD, pin 16, to +5V and VSS, pin 8, to ground. This establishes sufficient power to the 4511 chip.The LT pin, pin 3, is connected to +5V. This pin would turn on all the outputs if connected LOW. Being that we don't wish to use this feature, we simply connect it permanently HIGH. However, if you do want to use this feature, you can simply connect it to a pull-up resistor with a pushbutton. When unpressed, the pin will be HIGH. When pressed down, it would be LOW and turn on all the outputs.The Blanking pin, pin 4, is connected to +5V. This pin would blank all the outputs if connected LOW or to ground. Being that we don't want the blanking feature activated, we simply connect it permanently to HIGH. However, if you want to use this feature in your circuit, you simply connect a pull-up resistor to this pin with a pushbutton. When unpressed, the pin will be HIGH. When pressed, it will go LOW and turn off all the outputs.The LE/STROBE pin, pin 5, is connected to ground. This is because we want to strobe the outputs to the 7 segment LED display. The 4 data pins are D, B, C, and A. These pins are all connected to pull-down resistors. Without the pushbuttons being pressed, the pins are all in a LOW state. If the pushbuttons are pressed, they go to a HIGH state. Depending on the combination of pushbuttons being pressed determines the decimal digit that will be shown on the 7 segment LED display. Circuit Working The circuit works directly through the control of the 4 pushbuttons which control the binary value we feed into the data input pins.Being that they are all connected to pull-down resistors, they are all initially LOW when unpressed. So the 7 segment LED display will show a 0 initially.The combination of pushbuttons pressed and unpressed determines the decimal digits, according to the binary value. The equivalent decimal value of the binary value we feed into the data input pins will be shown. We can show the digits 0 through 9. We cannot show any other digits on the 7 segment display. So the highest value we can feed into is 1001, which is 9 in decimal. The 4511 really makes it much simpler to work with single 7 segment LED displays. ________________________________________________________ Download Link of Circuit:- http://www.mediafire.com/file/f9dqjibrl0hh2wc/7_segment_%28pro%29.zip _________________________________________________________ TISHITU ISO: 9001-2008 RESEARCH AND CONSULTANCY CELL OF INDUSTRIAL APPLICATION A Joint Accreditation System of Australia and New Zealand Copyright © All Rights Reserved www.tishitu.org Reg No.08122629691/SSI Accreditation No. M3111204IN -~-~~-~~~-~~-~- Please watch: "Lifi Communication by Arduino UNO Download Project" https://www.youtube.com/watch?v=c4gC8dbaiZg -~-~~-~~~-~~-~-