SegmentPins is an array that stores the arduino pin numbers that the segments are connected to. UpdateWithDelays, leadingZeros, disableDecPoint) ĭigitPins is an array that stores the arduino pin numbers that the digits are connected to. begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments, Then, you only need to specify 7 segmentPins SevSeg sevseg //Instantiate a seven segment object void setup() īool resistorsOnSegments = false // 'false' means resistors are on digit pinsīyte hardwareConfig = COMMON_ANODE // See README.md for options bool updateWithDelays = false // Default 'false' is Recommended bool leadingZeros = false // Use 'true' if you'd like to keep the leading zeros bool disableDecPoint = false // Use 'true' if your decimal point doesn't exist or isn't connected. Pins are ordered as looking at the front of the display.Ĭheap, 4-digit, 12-pin display from Ebay (labelled HS410561k-32 on bottom edge):Ĥ-digit common anode display, with 2 rows of 6 pins. Segments are numbered A through G plus Decimal Point (DP), according to this picture. In the below pinout, digits are numbered 1, 2, 3, 4. There are usually called high-side switches. Note that use of active-high, high-side switches will have no impact on the configuration chosen. NP_COMMON_ANODE - If your setup uses N-type AND P-type transistors with a common anode display.NP_COMMON_CATHODE - If your setup uses N-type AND P-type transistors with a common cathode display.P_TRANSISTORS - If you use P-type transistors to supply current (or any other active-low, high-side switches).N_TRANSISTORS - If you use N-type transistors to sink current (or any other active-high, low-side switches).Some displays (mostly bigger ones) use switching transistors, but most people won't have to worry about the configurations below. These displays require a high voltage at the digit pin to illuminate the digit. COMMON_ANODE - For common anode displays without switches.These displays require a low voltage at the digit pin to illuminate the digit. COMMON_CATHODE - For common cathode displays without switches.These displays are powered directly through the Arduino output pins. You have to specify your hardware configuration to the library as the first argument in sevseg.begin. If you use current-limiting resistors on the segment pins instead, then set resistorsOnSegments to true (see the example SevSeg_Counter.ino). 330 ohms is a safe value if you're unsure. Current-limiting resistorsĭon't forget that the display uses LEDs, so you should use current-limiting resistors in series with the digit pins. 8 Segment Pins - One for each of the seven segments plus the decimal point.Īll digit pins and segment pins can be connected to any of the Arduino's digital pins, or analog pins with digital support just make sure you take note of your connections! Analog pins on most Arduinos have digital support, but the Arduino Nano is an exception.They will be cathodes (negative pins) for common cathode displays, or anodes (positive pins) for common anode displays. However, there's a mostly-compatible branch that does support shift registers. This library does not support shift registers. It's often preferred to drive seven segment displays through shift register ICs (or other GPIO-expanding ICs), as that only uses ~3 micrcontroller pins instead of ~12 pins. Read the Hardware and Software sections below for more info. Try an example to get started, such as SevSeg_Counter. If I have the time, I'm happy to help you get things working. Please use GitHub for any questions or suggestions. alphanumeric characters (as accurately as possible).common cathode and common anode displays.Use it to easily display numbers on your seven segment display without any additional controllers. This library turns your Arduino into a seven segment display controller.
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