The Big Picture. Will this work?

[dakky]

Greetings everybody.

I'm beginning to dig myself into the topic of DIY homeautomation :D But there are also some questions i can't answer myself properly :(
I'm planning the following setup:

• raspi as OpenHAB Base with raspbian
• MQTT Gateway (installed on the pi? possible?)
• sensors:
  • energy source: battery for all. I don't want to cut cables into my walls (besides: my wife would kill me :D ) runtimes should be at least 6 months ^^
  • transmission sensors -> gateway: WiFi with (WPA2 enabled) would be awesome, maybe bluetooth4 (with bluetooth low energy ??)
  • sensor types: temp, humidy and door/window sensors

Any chance to archieve this?

Thx

[Magiske]

OpenHab on a pi is a good choice.
I would use an Arduino Uno with an ethernet shield for the MQTT gateway, so much easier to setup.
A good 18650 3.7v battery should give you more than 6 months if you power trim you sensors.
And the transmission would be by using NRF24L01+'s.

So all about making it easy for yourself:)

So to answer you question.. Yes, should be easy to achieve fairly fast.

[tbowmo]

@dakky

have seen http://www.mysensors.org/hardware/micro ? (temperature/humidity sensor, battery powered)

[dakky]

@tbowmo
jep thats the target on the sensor side. I'd select an ardiuno pro micro (3,3V), strip the LED from it an connect the sensors and the NRF24L01+ to it. Of course i could buy your sensor board (and maybe, depending on price an availability i will), but where is the fun and the learning progress? :D

@Magiske
but why an extra device for the gateway? Is it really "too hard" to connect the receiving NRF24L01+ via the gpio and run it under raspbian? An extra device means extra costs and extra wiring (power, LAN).

[Magiske]

@dakky Well you can do the gateway for around $13ish and thats easy. Adding the gateway module to the running OpenHab could be easy if they can coexist. I have not done that, so again, it could be easy. But since you are just starting out, keep it easy.
And afterwards, you can reuse the uno for other projects..

[dakky]

hmm do you have a hint for me? I'm trying to understand the way the gateway works. The ethernet part is ok. But what about the NRF24L01+ and WiFi? Do u have some docs/tutorials/codesnipplets for me?

[dakky]

u i got trapped .... the nrf24l01+ does't do WiFi. It just uses the same band :( i would prefer real WPA2 protected WiFi. Is anything like that possible (with battery power)?
if NOT, how "secure" is it, to use open radio transmission for communication?

[maha]

Under Development is a great thread about security:

[security] Introducing signing support to MySensors

[tbowmo]

@dakky

look here http://forum.mysensors.org/topic/1021/security-introducing-signing-support-to-mysensors