How do you use the common cathode 7 segment display? This BCD to seven segment decoder has four input lines (A, B, C and D) and 7 output lines (a, b, c, d, e, f and g), this output is given to seven segment LED display which displays the decimal number depending upon inputs. Seven segment displays are often packaged in rectangles, but the digit shape slants, which makes the digits more attractive and also creates a convenient space for a small decimal point at the bottom right and an inverted comma at the top left. Check your meter with a sound test (touch both the leads together, and a sound will be produced).Ģ.2.Now take the multimeter (assuming a red lead for positive and a black lead for negative) and set it to the proper continuity range.Hold the display in your hand and identify pin 1.How do you find common anode 7 segment display? Now if your small circle led lit’s it means that your seven segment is properly working and now you can use it.Apply +5 volts to dp(decimal/display point) pin in series to a 510 ohm-1k ohm resistor to limit the current.For common cathode make GND pin ground.
