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Topic: DECT Shield for Arduino (Read 14 times) previous topic - next topic

MPV2

Aug 12, 2012, 09:06 pm Last Edit: Mar 04, 2013, 11:13 pm by MPV2 Reason: 1
04/03/2013: Shield is now completed. Official website at http://web.ist.utl.pt/ist163119/dect.html.

Hello community!

I want to share with you the DECT Shield for Arduino which allows transmission of data and audio between similar shields and other DECT capable devices such as home cordless phones. The Shield was developed as part of my thesis for my MSc degree.




DECT (Digital Enhanced Cordless Telecommunications) was introduced in Europe in the early 1990's and was used for creating cordless phone systems. This technology allows the transference of audio reliably and interference free up to 100 meters (outdoors). Nowadays it is present in most home cordless phones, in large scale business telephone system and in baby monitors for example.

The shield is equipped with a Bithium DECT Module which has all the necessary components to make DECT calls and data transference possible. Arduino communicates with the module and the memory card using SPI.
The shield requires pins 8 to 13 from the Arduino to function. Pin 2 can also be used to trigger module events on the Arduino but it isn't mandatory. Other SPI modules can be used on pins 11 to 13.
A headset with a microphone and a speaker can be connected to the shield to perform calls. A standalone speaker with at least 4 ohm is also allowed to be connected to the shield without requiring other external components to function.

The main features of the shield are:
 -> Reliable audio transference between two or more modules at least up to 30 meters;
 -> Low data rate transference up to 1.2kbit/s;
 -> Connectivity with other DECT devices;
 -> Direct playback of audio files from a Micro SD card;
 -> Dual firmware system allows it to work as Basestation or Handheld;
 -> Easy to understand Arduino API.

The main features of DECT are:
 -> Interference free communications up to 100 meters;
 -> 1880MHz to 1900MHz frequency range;
 -> Up to 120 simultaneous duplex channels;
 -> Uses TDMA and frames of 1.728MHz;
 -> Suitable for low power applications (average consumption of 10mW).

For more information please check the official website at http://web.ist.utl.pt/ist163119/dect.html.
The Arduino API documentation is available at http://web.ist.utl.pt/ist163119/dectapi.html.
Application examples can be downloaded from the main webpage.

Please contact Bithium if you want to adquire the shield or the DECT module using one of the contacts present at http://www.bithium.com/about/contact.

Regards,
MPV2

Graynomad

I have no use for this but it looks like you've done a real nice job there.

What's the range?

You should get it added to shieldlist.org, although it seems Jon has something of a backlog there.

______
Rob
Rob Gray aka the GRAYnomad www.robgray.com

MPV2


I have no use for this but it looks like you've done a real nice job there.

What's the range?

You should get it added to shieldlist.org, although it seems Jon has something of a backlog there.

______
Rob


Hi Graynomad,

Thanks you, I will remember to add it.

The average range is 100m outdoors without obstacles.
I also did some testing indoors and was able to get a good reception at a distance of approximately 30m.

Regards

geschnei

Nice work, and just what I'm currently looking for. Do you have schematics for it online?

Regards,
  Gerald

MPV2


Nice work, and just what I'm currently looking for. Do you have schematics for it online?

Regards,
  Gerald


Hi Gerald,

Sorry for the delay.

A PDF with the shield schematic can be downloaded here.

Unfortunately I cannot release the API just yet because there are still some bugs I need to correct. When ready I will post a replay here with the code and documentation.

Regards

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