![]() Now that we understand how the 7-segment display works, we can connect it to the Arduino!īegin by mounting the 7-segment display on your breadboard, making sure that each side of the display is on a different side of the breadboard. The following figure shows how current-limiting resistors are connected to the display’s LED segments. If you’re using a different color 7-segment display and aren’t sure how much current each LED segment requires, 330Ω is a safe value. If you plan to use them outside, though, you’ll want to use a 150Ω resistor for maximum brightness. That’s fine, because these displays are pretty bright, so under-driving them a little bit usually makes them look better. With a 220Ω, the display’s brightness will be slightly reduced. Typically, for a standard red 7-segment display, each LED segment requires approximately 15 mA to illuminate correctly therefore, on a 5 volt digital logic circuit, the value of the current-limiting resistor would be approximately 200Ω (5v – 2v)/15mA, or 220Ω to the nearest higher preferred value. In a common cathode display, the com pin is connected to GND, and a positive voltage is applied to each segment (a-g) to illuminate it.Ī 7-segment display may appear to be a single display, but it is actually made up of seven independent LEDs housed in a single package, each of which requires its own current-limiting resistor to prevent damage to the LED segments. As the name implies, in common cathode displays, all of the cathodes (or negative terminals) of the segment LEDs are tied together, whereas in common anode displays, all of the anodes (or positive terminals) of the segment LEDs are tied together. The difference is the polarity of the LEDs and the common terminal. The internal structure of both types is nearly identical. There are two types of seven segment displays: common cathode (CC) and common anode (CA). Depending on the type of display, this pin must be connected to either GND (common cathode) or 5V (common anode). By lighting up individual segments, you can create any numeric character.ĬOM The pins 3 and 8 are connected internally to form a common pin. A, b, c, d, e, f, g, and DP are connected to the digital pins on an Arduino to operate the display’s individual segments. ![]()
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