If this is your first
Arduino project, first go through our “Arduino: GettingStarted” tutorial
Use our LED resistor calculator to
calculate the resistor value that won't destroy your LED! Connecting
these LEDs directly to Arduino IO pins will eventually burn them out!
Connect LED pins 3 and 8 to GND. Use a resistor between each of the other
connections to your Arduino.
Here are the pin mappings
of the display, note that common anode displays will have reversed wiring:
Use
your solderless breadboard to make the connections between the seven segment
LED and your Arduino board:
Arduino
Pin
|
7
Segment Pin Connection
|
2
|
7
(A)
|
3
|
6
(B)
|
4
|
4
(C)
|
5
|
2
(D)
|
6
|
1
(E)
|
7
|
9
(F)
|
8
|
10
(G)
|
9
|
5
(DP)
|
Software
This
Arduino software example counts down from 9 to 0. This is a nice, compact
version that uses a 2 dimensional array to hold the LED bit patterns, and
"for" loops to get things done. If you want a longer, more
verbose method, scroll down for that.
//
Arduino 7 segment display example software
// http://www.hacktronics.com/Tutorials/arduino-and-7-segment-led.html
// License: http://www.opensource.org/licenses/mit-license.php (Go crazy)
//
Define the LED digit patters, from 0 - 9
// Note that these patterns are for common cathode displays
// For common anode displays, change the 1's to 0's and 0's to 1's
// 1 = LED on, 0 = LED off, in this order:
//
Arduino pin:
2,3,4,5,6,7,8
byte seven_seg_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
{ 1,1,1,0,0,1,1 } // = 9
};
void setup()
{
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
writeDot(0); // start with the "dot" off
}
void writeDot(byte dot) {
digitalWrite(9, dot);
}
void sevenSegWrite(byte digit) {
byte pin = 2;
for (byte segCount = 0; segCount < 7; ++segCount) {
digitalWrite(pin, seven_seg_digits[digit][segCount]);
++pin;
}
}
void loop() {
for (byte count = 10; count > 0; --count) {
delay(1000);
sevenSegWrite(count - 1);
}
delay(4000);
}
Another version but complicated Codes
// Longer, more obvious example for Arduino 7
segment display
// http://www.hacktronics.com/Tutorials/arduino-and-7-segment-led.html
// License: http://www.opensource.org/licenses/mit-license.php (Go crazy)
void setup()
{
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
digitalWrite(9, 0); // start with the "dot" off
}
void loop() {
// write '9'
digitalWrite(2, 1);
digitalWrite(3, 1);
digitalWrite(4, 1);
digitalWrite(5, 0);
digitalWrite(6, 0);
digitalWrite(7, 1);
digitalWrite(8, 1);
delay(1000);
// write '8'
digitalWrite(2, 1);
digitalWrite(3, 1);
digitalWrite(4, 1);
digitalWrite(5, 1);
digitalWrite(6, 1);
digitalWrite(7, 1);
digitalWrite(8, 1);
delay(1000);
// write '7'
digitalWrite(2, 1);
digitalWrite(3, 1);
digitalWrite(4, 1);
digitalWrite(5, 0);
digitalWrite(6, 0);
digitalWrite(7, 0);
digitalWrite(8, 0);
delay(1000);
// write '6'
digitalWrite(2, 1);
digitalWrite(3, 0);
digitalWrite(4, 1);
digitalWrite(5, 1);
digitalWrite(6, 1);
digitalWrite(7, 1);
digitalWrite(8, 1);
delay(1000);
// write '5'
digitalWrite(2, 1);
digitalWrite(3, 0);
digitalWrite(4, 1);
digitalWrite(5, 1);
digitalWrite(6, 0);
digitalWrite(7, 1);
digitalWrite(8, 1);
delay(1000);
// write '4'
digitalWrite(2, 0);
digitalWrite(3, 1);
digitalWrite(4, 1);
digitalWrite(5, 0);
digitalWrite(6, 0);
digitalWrite(7, 1);
digitalWrite(8, 1);
delay(1000);
// write '3'
digitalWrite(2, 1);
digitalWrite(3, 1);
digitalWrite(4, 1);
digitalWrite(5, 1);
digitalWrite(6, 0);
digitalWrite(7, 0);
digitalWrite(8, 1);
delay(1000);
// write '2'
digitalWrite(2, 1);
digitalWrite(3, 1);
digitalWrite(4, 0);
digitalWrite(5, 1);
digitalWrite(6, 1);
digitalWrite(7, 0);
digitalWrite(8, 1);
delay(1000);
// write '1'
digitalWrite(2, 0);
digitalWrite(3, 1);
digitalWrite(4, 1);
digitalWrite(5, 0);
digitalWrite(6, 0);
digitalWrite(7, 0);
digitalWrite(8, 0);
delay(1000);
// write '0'
digitalWrite(2, 1);
digitalWrite(3, 1);
digitalWrite(4, 1);
digitalWrite(5, 1);
digitalWrite(6, 1);
digitalWrite(7, 1);
digitalWrite(8, 0);
delay(4000);
}
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