Jan 07, 2013
Morse code smartphone applications found!

 I´ve found an app for iPhone called SpyLight, that can translate flashing light to plain text. There are several morse-apps for the iPhone but this is the only one I got to work with the BL4 beacon. Since the app runs with a fixed WPM-rate and standard morse timing (hard to read by the naked eye) I had to alter the sourcecode (see below). Perhaps I can make the BL4 beacon to alter between improved timing for easy reading and the faster hard-to-read style that can be interpreted by SpyLight.  I will make an attempt to contact the creator of SpyLight to see if there's an interest for making a special
BL4-compatible version.

SpyLight at iTunes

Squeakysoftware, creator of SpyLight

There seems to be some apps for Android as well but I have not tried them. MorseTalk may be an interesting one for Android. (MorseTalk for iPhone have no camera input so it can only read audible code)



Jan 08, 2013
Improved software (C-source V1.3) released:
  • Special characters for "." and "/" implemented.

  • Message changed from "WWW BL4 DOT EU" to "WWW.BL4.EU"
       for easier reading.

  • Lower threshold for daylight battery saving.

  • Preprocessor selection: ATmega48/88/168 or ATtiny24/44/84.

  • Preprocessor selection: Improved morse code timing for easier
       reading or standard timing optimized for iPhone app "SpyLight".
  • Jan 20, 2013
    V1.4 C-source/HEX release:
  • Function "sendmsg" replaced by "senddomain"
  • Morse code timing adjusted for improved video recordings.

  • Today BL4.EU have joined Facebook!
    Mars 06, 2013
    V2.0 released:

    Sourcefile now covers ATmega48/88/168, ATtiny24/44/84 and
    the cheap little ATtiny13.

    Average MCU current consumption have been reduced from aprox 350uA to 25uA (ATtiny13) in active mode by using the watchdog timer interrupt and deep sleepmode (power down) for all timing/delays.
    (previous versions used TIMER0 or TIMER1 and Idle sleepmode.

    Mars 19, 2013:

    Sourcecode for a ATtiny13A high power version and wiring diagrams are now available in the download section. The high power version 2.1a have no daylight battery saving and can drive 4x40mA according to AVR port specifications. The ports can probably handle higher peak currents since the average LED on-period is quite short. This is important when running on 4.5V and/or with red LED´s or others with a forward voltage drop lower than the supply voltage. Series resistors may have to be installed even if they waste power.

    Go to download section


    Text and concept by John Ahlberg, Stockholm, Sweden 2013