1.7K
In this example we will connect a 7 segment display to an Arduino. There are 2 types of 7 segment displays, a common anode type and a common cathode type. This example used the common anode type, you can still use a common cathode type but the values will be different in the code.
Basically as the name suggests these are simply displays with multiple LEDs in them
Schematic
Code
[codesyntax lang=”cpp”]
const int A = 4; const int B = 5; const int C = 6; const int D = 7; const int E = 8; const int F = 9; const int G = 10; //all of the values below are for a common anode display //coomon cathode would need the values inverted HIGH -> LOW void clearDisplay() { //sets the LEDs high digitalWrite(A, HIGH); digitalWrite(B, HIGH); digitalWrite(C, HIGH); digitalWrite(D, HIGH); digitalWrite(E, HIGH); digitalWrite(F, HIGH); digitalWrite(G, HIGH); } void one() { //Displays 1 digitalWrite(A, HIGH); digitalWrite(B, HIGH); digitalWrite(C, HIGH); digitalWrite(D, HIGH); digitalWrite(E, LOW); digitalWrite(F, LOW); digitalWrite(G, HIGH); } void two() { //Displays 2 digitalWrite(A, LOW); digitalWrite(B, LOW); digitalWrite(C, HIGH); digitalWrite(D, LOW); digitalWrite(E, LOW); digitalWrite(F, HIGH); digitalWrite(G, LOW); } void three() { //Displays 3 digitalWrite(A, LOW); digitalWrite(B, LOW); digitalWrite(C, LOW); digitalWrite(D, LOW); digitalWrite(E, HIGH); digitalWrite(F, HIGH); digitalWrite(G, LOW); } void four() { //Displays 4 digitalWrite(A, HIGH); digitalWrite(B, LOW); digitalWrite(C, LOW); digitalWrite(D, HIGH); digitalWrite(E, HIGH); digitalWrite(F, LOW); digitalWrite(G, LOW); } void five() { //Displays 5 digitalWrite(A, LOW); digitalWrite(B, HIGH); digitalWrite(C, LOW); digitalWrite(D, LOW); digitalWrite(E, HIGH); digitalWrite(F, LOW); digitalWrite(G, LOW); } void six() { //Displays 6 digitalWrite(A, LOW); digitalWrite(B, HIGH); digitalWrite(C, LOW); digitalWrite(D, LOW); digitalWrite(E, LOW); digitalWrite(F, LOW); digitalWrite(G, LOW); } void seven() { //Displays 7 digitalWrite(A, LOW); digitalWrite(B, LOW); digitalWrite(C, LOW); digitalWrite(D, HIGH); digitalWrite(E, HIGH); digitalWrite(F, HIGH); digitalWrite(G, HIGH); } void eight() { //Displays 8 digitalWrite(A, LOW); digitalWrite(B, LOW); digitalWrite(C, LOW); digitalWrite(D, LOW); digitalWrite(E, LOW); digitalWrite(F, LOW); digitalWrite(G, LOW); } void nine() { //Displays 9 digitalWrite(A, LOW); digitalWrite(B, LOW); digitalWrite(C, LOW); digitalWrite(D, LOW); digitalWrite(E, HIGH); digitalWrite(F, LOW); digitalWrite(G, LOW); } void zero() { //Displays 0 digitalWrite(A, LOW); digitalWrite(B, LOW); digitalWrite(C, LOW); digitalWrite(D, LOW); digitalWrite(E, LOW); digitalWrite(F, LOW); digitalWrite(G, HIGH); } void LoopDisplay() { //Loop through all numbers one(); delay(1000); two(); delay(1000); three(); delay(1000); four(); delay(1000); five(); delay(1000); six(); delay(1000); seven(); delay(1000); eight(); delay(1000); nine(); delay(1000); zero(); delay(1000); } void setup() { //Setup our pins pinMode(A, OUTPUT); pinMode(B, OUTPUT); pinMode(C, OUTPUT); pinMode(D, OUTPUT); pinMode(E, OUTPUT); pinMode(F, OUTPUT); pinMode(G, OUTPUT); } void loop() { clearDisplay(); LoopDisplay(); }
[/codesyntax]
Links
UNO R3 MEGA328P ATMEGA16U2 + USB Cable