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The modules we will be using have a common cathode. These data pins are referred to in the datasheet as D, B, C, and A. How the Circuit Works The circuit works directly through the control of the 4 pushbuttons which control the binary value we feed into the data input pins.

Driving a 7 segment display with a 4511 BCD to 7 Segment Driver

5411be in normal operation, it’s held LOW. However, if you want to use this feature in your circuit, you simply connect a pull-up resistor to datsaheet pin with a pushbutton. You should now see a 4 on the 7 segment LED display. Pin 3 is 4511ve LT pin, which is the Lamp Test pin. If we input a binary value into the data pins, we get the corresponding decimal digit equivalent shown out on 4511he 7 segment display.

So we can see which combinations of pushbuttons turned on displays which decimal values. This is because we want to strobe the outputs to the 7 segment LED display. Each segment is identified by a letter as can be seen below as well as the pinout and schematic for reference. The decimal equivalent of the binary value that it holds will be displayed on the 7 segment display. Already have an account?

Using the 7 segments, you can make any decimal digit. Depending on the combination of pushbuttons being pressed determines the decimal digit that will be shown on the 7 segment LED display; this is summarized in the table above. The photo below shows the finished circuit.


BE Datasheet, PDF – Alldatasheet

Using the pushbuttons, you can manually see how depending on 4511eb pushbuttons we press, how the output changes in response. These pins are all connected to pull-down resistors.

Those are symbol for LED, to represent the 7-segment display, not normal diodes. Your email address will not be published. These are the pins we attach to each of the corresponding pins on the 7 segment LED display.

In this example I will be using 2 x and 2 x 7 segment module. Using binary coded decimal BCDwe can display any numerical digit on the 7 segment display from 0 to 9- using only 4 pins.

This means that the negative side of all the LEDs are connected together. Lastly, the 8 output pins are labeled a, b, c, d, e, f g, which are pins 12, 12, 11, 10, 9, 15, and With the binary value input, the equivalent decimal value of that binary number is displayed on the 7 segment display. Otherwise, without this chip, to display all the decimal digitsyou would have to use 7 pins; so it saves us 3 pins.


So the highest value we can feed into iswhich is 9 in decimal. When LOW, the pin is in strobe mode, meaning it strobes the output to a given device, which in this case is a 7 segment LED display. 4511ve the pushbuttons are pressed, they go to a HIGH state.

The is a pin chip. This is just for information.

This is why it’s called binary coded decimal. The table below summarizes the binary input values to the decimal digit shown on the 7 segment display. When HIGH, this feature is not ativated.

How to Build a 4511 BCD to 7 Segment Decoder Circuit

We are factory specialized in making LED 7-segment display, dot-matrix display, light bar display and abnormity digital display. When LOW, this feature is not activated. Leave a reply Click here to cancel the reply Your email address will not be published. The segments are then displayed on the basis of those internal registers.

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This establishes sufficient power to the chip. Go to the shop. Now controlling a 7 segment display like this is OK, but we can do much better. First we need to familiarize ourselves with the 7 segment module. For example, if we want to display 6 on the 7 segment display, we input the value into the DBCA data pins. Next article Severed hand in a jar Halloween display. If the voltage is too high or the resistor too low think of the wire being a resistorthe current going through the LED will exceed the maximum forward current and burn out the LED.

Being that we don’t want the blanking feature activated, we simply connect it permanently to HIGH.

However, if you do want to use this feature, you can simply connect it to a pull-up resistor with a pushbutton. This provides a little over 5ma for each segment. Any value above this amount cannot be shown on the 7 segment LED display. When pressed down, it would be LOW and turn on all the outputs. This pin would blank all the outputs if connected LOW or to ground. This pin is active LOW. We can choose what digit we want to display by inputting the equivalent binary value into these data pins.

The equivalent decimal value of the binary value we feed into the data input pins will be shown. When HIGH, it is store mode.