sie 092015

After a long break I decided to reactivate the blog. This time I have a nnew, even more useless invention – an unusual bluetooth accesory.

Most of you probably use smartphones with touch screens, but some people still prefer classic mobile phones. Now you dan dial the numbers from your little notebook just like in the good, old days!

The device is based on Nordic Semiconductor nRF51422 chip (NRF51 DK board). It is recognized as a bluetooth keyboard, so no additional software is required. All you need is a phone with Bluetooth 4.0 Low Energy (BLE) support. The firmware is a modiffied HID keyboard example from the SDK, so it took me only about an hour to add a rotary dial support. The dial itself which generates the pulse dial signal was taken out of an old phone. The board could be powered from a 3V coin cell battery, but I have connected a large, flat, 4,5V battery because small coin batteries are not hipster enough!

You can get the source code below. NRF51 SDK 8.0.0 is required to build(available here). I have built it with Keil 5, but it should also work with ARM GCC or IAR compilers.

  Pobierz plik:
  Rozmiar: 3.65 MB
Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in /home/ebiwptr/silent/home/filedb.php on line 99

  20 komentarzy to “Hipster phone – bluetooth rotary dial”

  1. Age is usually probably the most useful, as it can instantly remove a ton of false

  2. Full name, age, and any kind of residence data will get you much more focused

  3. 하나 구입하고싶다 어찌해야되는가

  4. Very funny and quie ingenious.

  5. Wow, that was really cool to see. I miss using the rotary phones. I remember playing with them at my grandparents house when I was little. Thanks so much for explaining how you did this project.

  6. Benefits of Magnetic Power Generator

    All worldwide shortage of power is a type
    of problem and that’s why people are seeking some reliable
    and cheap electric source. Many folks are using magnetic generators along with the reason behind this is
    because they get many advantages through them.
    This generator is incredibly all to easy to install in your
    house in a very limited place without disturbing the main settings of your property.

    All you need is a bit spare space to put in this. This will help you to relieve your normal electricity bill.
    You can use this being an energy supplier for many with the times so you don’t need to switch time for your old means of power
    consumption. As soon as you start employing this supply of energy in your own home you will
    notice a visible saving inside your income.

    It doesn’t produce any harmful gases that may damage environment.
    In this generator, magnets will generate energy which is usable in a condition. The cost of having one of these power
    generator is not high in any respect. It is the cheapest supply of
    power generation in the modern era of technology. The main thing in this generator can be
    a magnet which works and also a small wheel.

    As you are already aware it is absolutely free and there is
    no vacation involved in installing this generator, and that means you won’t need any maintenance from some expert.
    You can maintain it by yourself by cleaning it at regular
    intervals. This is the best thing to set in your home like a electrical source.
    It can contain the energy sufficient to handle all of the appliances in the house.
    A family of four to 6 is extremely suitable for this type
    of energy generation device.

    No harmful rays with no complex electric motors may take place here
    and that means you shouldn’t worry about the safety of your family and friends.
    Unlike other free electric generation devices, it doesn’t need any solar power or wind.

    It will focus on its own with no source of external natural energy.

    Weather will not likely customize the performance or generation of energy out
    of this magnetic generator. As it doesn’t depend upon any external
    source which means this could be an uninterrupted way to obtain power generation.

    Check more info on site :

  7. – to kompleks trzech ekskluzywnych apartamentowców…

  8. I only have access to Raspberry Pi 3 Model B, is there a way of connecting it in the same way as you have with the NRF51 DK board? I see that the Raspberry Pi 3 is also bluetooth, so wondered if it were possible.

    Thanks for the help.

  9. Cześć Paweł!!
    Czy mógłbyś dać listę podzespołów itd. do tego projektu?

  10. Hi Pawel,

    I love the bluetooth dial, have done a project with a rotary phone dial too (see link below)

    I really love your Floppotron device. I almost dropped on the floor laughing.!
    Imagine it in concert with a real orchestra.!! Keep up the good work man.

  11. Hi there,

    Loving your projects!

    For the phone, is there any way you can implement a I/O low=>high flank pick up phone or open dual screen and same I/O high=>low hang up? Other I/O pulse for call?

    So that no screen action on the phone is nescesarry?

    I’ve got idea of making a desk docking station / charger of an old phone.

    Hope you like the idea

  12. Hi! I’d love to speak to you about a project for my company. Absolutely love your videos and wondering if you would be interested in working together. Please let me know and we can discuss further.


  13. You should build some kind of dock around it like it’s a real telephone, i’m sure you could have that 3d printed! Would be awesome! Also more floppotron tunes man!!!! cheers from france!

  14. […] convert a rotary dial for use with modern technology, but this one adds a new twist to the mix: it uses Bluetooth 4.0. [Silent] used a Nordic Semiconductor NRF51 DK development board for the project, which was built […]

  15. […] convert a rotary dial for use with modern technology, but this one adds a new twist to the mix: it uses Bluetooth 4.0. [Silent] used a Nordic Semiconductor NRF51 DK development board for the project, which was built […]

  16. […] convert a rotary dial for use with modern technology, but this one adds a new twist to the mix: it uses Bluetooth 4.0. [Silent] used a Nordic Semiconductor NRF51 DK development board for the project, which was built […]

  17. Very cool! I will look into building myself. I will let you know if I have any success with the project.
    Thanks for your time and effort. SSSuper Cool!!!!

  18. […] writes on his blog that this bluetooth-enabled rotary dial is the perfect “useless invention” that’s all about […]

  19. […] Zadrożniak wrote in to show us how he built a functioning rotary dial for his cell phone. The project isn’t very complex, you only really need three pieces: the rotary dial, […]

 Leave a Reply

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>