BlinkCode Library is used for indicating flashing fault codes or various numeric settings. It uses long pulses for indicating tens and short pulses for indicating onces. Library is implemented in C++ with build-in Arduino port, but it is easy to port to different architecture.

• asynchronous non-blocking API with background processing
• hardware independent high-level architecture
• works well with digital, analogs and other signal output backends
• unlimited number of parallel blink codes
• easy to use with Arduino boards
• support 1-99 codes numbers
• configurable pulse times

Basic code trigger:

#include <Arduino.h>

#include <BlinkCode.h>

constexpr int LED_PIN = 13;

using namespace blinkcode;

BlinkCode code(LED_PIN);

void setup()
{
    pinMode(LED_PIN, OUTPUT);           // Digital output for led

    code.begin();                       // Initialize and register blink code object
    code.trigger(12);                   // Start flash code - single long, double short
}

void loop()
{
    BlinkCode::service();               // Asynchronous service routine, should be called periodically
}