Hellduino: Hellschreiber radio transmissions from an Arduino board

[Mark VandeWettering] was experimenting with a simple transmitting circuit and an Arduino. The circuit in the project was designed by [Steve Weber] to broadcast temperature and telemetry data using Morse Code. But [Mark] wanted to step beyond that protocol and set out to write a sketch that broadcasts using the Hellschreiber protocol.

This protocol transmits glyph images, which are decoded as you see above. For some reason we can’t help but think this is like Captcha for radio enthusiasts. We have seen Hellschreiber used with AVR microcontrollers before, but this is the first Arduino implementation that we’ve come across. [Mark] does a great job of demonstrating his project in the video after the break. He mentions that the transmitter has no antenna, but is still being picked up by his receiving antenna mounted behind his house.

Since [Mark] doesn’t really cover the hardware he used, you will need to look back at [Steve's] original design schematics for more information.

[Thanks Toymaker Television]

Comments

  1. xvpower says:

    Neat, the article title made me smirk.

  2. NatureTM says:

    If you participated in freeday yesterday, everything’s going to look like Captcha for awhile.

  3. mess_maker says:

    Wow, impressed by this project.

    @NatureTM – that is funny! and so true :)

  4. hpux735 says:

    That looks like a fun project! Nice work.

    @NatureTM – no kidding. For all the complaints about it, I still think it was more “fair” than in years past. I certainly don’t want to do any more captchas for a while, though.

  5. Michael says:

    Very cool, I first ran into something like this on someone else’s site… good to know people still use amateur radio techniques! http://www.swharden.com/blog/2011-08-05-i-before-e-except-after-hellschreiber/

    Not my site!

  6. gs611 says:

    Is the transmitter powering the oscillator when PB3 is turned on? So that would in turn be On/Off Keying?

    http://en.wikipedia.org/wiki/On-off_keying

    Did I miss something?

  7. N0LKK says:

    That’s lot of steps to go through to get the receiver to display a character.

    • A typical receive setup for Hellschreiber (or any other digital mode supported by fldigi) is a receiver (a transceiver if you are sending as well), and a computer, connected by a cable or interface. In my case, the “receiver” was an RFSpace SDR-IQ software defined radio. This is a flexible receive setup, and I often use it during testing, where you (say) quickly want to visualize and hear the output of a transmitter. Thus my “receiver” as a laptop and a little black box. That perhaps made the setup look more complex than it really is.

      In the more conventional setup, you’ll have a receiver and a laptop, just like any other mode.

  8. blue carbuncle says:

    Hey HaD mods do ya think it would be possible to put the meaning of the acronym or a blurb on what the tech in tfa is about? I understand there are differing levels of knowledge on here, but it seems like a bit of a nerdcore oversight on here for a long while. I’m not saying ya have to write out Internet Protocol instead of IP, but you guys probably know what I mean.

  9. Noah says:

    Cool! This reminds me of my signal processing project sophomore year: http://www.youtube.com/watch?v=aAymp1uqxQQ

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