Because with the help of switches you have press the binary code 0001. When you press Switch S1 (this time first switch is at logic 1 else are at logic 0) then you will receive a numeric 1 on the display. Now make the connection as shown in circuit diagram. The pattern of LEDs is same as in a conventional 7 segment display. Here pins A, B, C, D are used to provide the BCD input where A is the least significant bit and D is the most significant bit. To understand the IC first have a look at its pin configuration. This will energize the proper output lines according to switch pressed to form a corresponding numeric value on 7 segment display. With the help of four switches we can provide a four bit BCD (binary coded decimal) value. In this BCD to 7 segment display circuit, we provide binary input with the help of tactile switches. Latch enable (LE) is used to store BCD codes. Blanking input is used to turn off or vary the brightness of the display. For testing, momentarily make the pin low, in short used to test the display. It also provides you the facility to check that all segments of 7 segment display are working properly or not (lamp test). This IC provides the facility of 4-bit storage latch, an 8421 BCD-to-seven segment decoder. One thing to be kept in mind with this circuit is IC 4511 is used only for common cathode display. 1: Prototype Of BCD to 7 Segment Display Circuit On BreadboardĬD4511 is a CMOS BCD to seven segment latch/decoder and is used in various application like in clock, watches, computer, calculators etc. Facility of blanking input and Lamp test provision.įig.It will display the numeric number from 0 to 9.This circuit uses single IC 4511 to display binary input into 7 segment display.It will help you to learn how to display binary input into 7 segment display.The BCD to 7 segment display circuit used here has following advantages. The circuit described below will solve your problem as it will display binary code on 7 segment displays, a very common and useful component of digital devices. So now you can build the BCD to 7-segment display circuit using these expressions.Many times we use LEDs in order to see binary outputs which are quite difficult to understand. The summary of the expressions for BCD_0 are:įor BCD_1, we can replace A,B,C=0 (A',B',C'=1). But "X" is not essential so we can choose not to circle "X" when it doesn't help us in further simplifying the expression.įor example, this is the K-map for output "a". Because "1" is essential so we must circle all of them in order to get the expression. In K-map, "1" is essential and "X" is not essential. This is because we are using BCD and we will never encounter the input from 1010 to 1111 unless you did something wrong in binary to BCD conversion. All outputs from 1010 to 1111 will be "don't care" or "X" in this truth table. But, this time we can put "don't care" in K-map to further simplify our expression. Next, we need to again, simplify the expression using K-map. So based on the 7-segment display, we need to turn on a,b,c,d,f and g to show "9". The output is based on the number we want to display. The truth table is built using the common cathode configuration. The table below shows the BCD to 7-segment display truth table. ***IMPORTANT: The ABCD in this part is referring to BCD, not the initial 4-bit binary number before the conversion.Īfter obtained the BCD, we can now construct the BCD to 7-segment display.
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