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• RE: DTMF processing with SIM900 GSM module

  Yury Tikhoglaz • 05/02/2017 at 11:02 • 0 comments

  I've played little bit with DTMF decoding and sending little bit and find out what SIM900 module which I use - have software level DTMF decoder.

  So, all you need is just send right AT+ command to the module, and it will start to decode DTMF signals (in perfect world).

  As result I don't need dedicated decoder at all.

  On the other side it is not so reliable as I wanted.

  Another thing I learned - this particular GSM module didn't work without SIM card at all. Which is really sad.
  

  Firmware for first aid kit is almost ready and waiting for to be pushed to GIT repository.
  

• Controller arrived

  Yury Tikhoglaz • 04/14/2017 at 11:58 • 0 comments

  So, controller and shields finally have arrived and I'm starting to write firmware.

  Since now you can track software changes in github - https://github.com/useti/assisted_first_aid_kit/tree/master/SOFTWARE/Controller
  

• First approach to the prototype - electronics

  Yury Tikhoglaz • 04/03/2017 at 08:45 • 0 comments

  For first prototype I've decided to use as many pre-buit parts as possible.

  So, BOM -

  • Arduino Leonardo;
  • GPRS Shield - I've selected this one but you may use any on your choice. But keep in mind what you will need microphone input and audio output;
  • Power source shield. Once again - I've selected this, but you may use any suitable for you. In perspective this first aid kit should use non-rechargeable bat;
  • GPS Shield - Not yet decided. For first prototype will use software stub.

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