Wednesday, November 5, 2014

Character Generator for 7 segments Display

This is a little WebApp helper, for those who want to experiment with 7-segment displays, and draw numbers or even a few other symbols and letters.
It will generate the arduino code for you. For it just draw the symbol you want, give it a description name and click save to add it to the list. Then use the Generate Code button.


Add character to List

Saved characters

Arduino Code

Example code

I wrote a sample code that you can use as example.

Also avaliable on GitHub

 * 7-segments display example code
 * This code is distributed under The MIT License (MIT)
 * Copyright (c) 2014 victornpb -
 * created on 18-nov-2014

#define C_ANODE false
const uint8_t myDisplayPins[8] = {3,4,5,6,7,8,9,10}; //dp A B C D E F G

byte font[] = {
  B1111110, //[0] => "0"
  B0110000, //[1] => "1"
  B1101101, //[2] => "2"
  B1111001, //[3] => "3"
  B0110011, //[4] => "4"
  B1011011, //[5] => "5"
  B1011111, //[6] => "6"
  B1110000, //[7] => "7"
  B1111111, //[8] => "8"
  B1111011, //[9] => "9"
  B1110111, //[10] => "A"
  B0000001, //[11] => "dash"

void setup(){
 display7Setup(myDisplayPins); //configure myDisplayPins as outputs

void loop(){
  display7(myDisplayPins, font[0]); //display "0"
  display7(myDisplayPins, font[9]); //display "A"
  display7(myDisplayPins, font[11]); //display "-"
  display7(myDisplayPins, B00000000); //turn all segments OFF

  //count 0 to 9
  for(int i=0; i<=9; i++){
    display7(myDisplayPins, font[i]);

/* Configure pins as outputs */
void display7Setup(const uint8_t displayPins[]){
  for(uint8_t i=0; i<8; ++i){
    pinMode(displayPins[i], OUTPUT);

/* Function that writes a bitmap to a 7-segment display */
void display7(const uint8_t displayPins[], byte bitmap){
  if (C_ANODE) { bitmap = ~bitmap; }
  for (uint8_t i=0; i<8; ++i) {
    digitalWrite(displayPins[7-i], (bitmap & 0x1)?HIGH:LOW);
    bitmap >>= 1;
Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.


  1. Replies
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