7-Segment Display Reference
Single-digit 7-segment display with two common pins (shared cathode/anode leads) and a decimal point.
Pin names
| Name | Description |
|---|---|
| A | Segment A (top) |
| B | Segment B (top-right) |
| C | Segment C (bottom-right) |
| D | Segment D (bottom) |
| E | Segment E (bottom-left) |
| F | Segment F (top-left) |
| G | Segment G (middle) |
| DP | Decimal point |
| COM.1 | Common pin 1 |
| COM.2 | Common pin 2 |
Attributes
This component has no configurable attributes.
Usage
Connect each segment pin (A–G) through a 220 Ω resistor to a GPIO pin, and tie both COM pins to GND. Drive a segment's GPIO HIGH to light it. To display a digit, set the combination of segments that draws it (see the segment layout below).
A
F B
G
E C
D// Pins: A=2, B=3, C=4, D=5, E=6, F=7, G=8
const int SEG_A = 2, SEG_B = 3, SEG_C = 4, SEG_D = 5;
const int SEG_E = 6, SEG_F = 7, SEG_G = 8;
// Each row: [A, B, C, D, E, F, G]
const bool DIGITS[10][7] = {
{1,1,1,1,1,1,0}, // 0
{0,1,1,0,0,0,0}, // 1
{1,1,0,1,1,0,1}, // 2
{1,1,1,1,0,0,1}, // 3
{0,1,1,0,0,1,1}, // 4
{1,0,1,1,0,1,1}, // 5
{1,0,1,1,1,1,1}, // 6
{1,1,1,0,0,0,0}, // 7
{1,1,1,1,1,1,1}, // 8
{1,1,1,1,0,1,1}, // 9
};
const int PINS[7] = {SEG_A, SEG_B, SEG_C, SEG_D, SEG_E, SEG_F, SEG_G};
void showDigit(int d) {
for (int i = 0; i < 7; i++) {
digitalWrite(PINS[i], DIGITS[d][i]);
}
}
void setup() {
for (int i = 0; i < 7; i++) pinMode(PINS[i], OUTPUT);
}
void loop() {
for (int d = 0; d <= 9; d++) {
showDigit(d);
delay(1000);
}
}In real hardware, add a 220 Ω resistor in series with each segment pin. The CNAP simulator does not enforce this.
Examples
| Description | Attrs |
|---|---|
| Default display | {} |