7 segment common anode8/16/2023 It doesn't matter which way the resistor is oriented. Connect a resistor from the power rail to an unused column of the breadboard. Run both the power and ground to their respective horizontal rail rows at the top of your breadboard. ![]() I suggest using between +3.6VDC to +5VDC power and a ground from batteries or a bench top power supply. ![]() Prepare a test circuit according to this diagram:īegin with a power source. Let's pretend we don't know this and determine the pin mapping by inspection. Many single digit 10 pin displays have the common pins in the center position of each row. From your bottom left, the first pin is number 1 and the numbering continues sequentially in a counterclockwise direction with pin 5 being at the bottom right, pin 6 at the upper right and concluding with pin 10 at the upper left. The pins are numbered similarly to Integrated Circuits. As it turns out, there are usually an even number of pins on these displays, with the "extra" pins being tied together as part of the "common" set. However, when I counted the pins on my 5161BS display, there were 10 - five on the bottom row and five on the top. With one common pin, there should be at least 9 pins. Because most displays also include a decimal point, colon or apostrophe, there are usually eight segments, seven for the digit and one for punctuation. The idea behind having a common cathode or anode display is that by sharing either positive voltage or a path to ground, fewer pins are necessary than if every segment had it's own pair of cathode and anode pins. Individual segments are lit when their pin receives sufficient positive voltage.
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