Arduino Link?

[Rasmus7700]

Hello.
I'm planning to use this software on my Raspberry PI - my big hurdle, is to get a gateway to Arduino, so it will be possible to use theese sensors and then integrate them in the KNX installation...
Is that possible, or what else can be done to integrate sensors in the installation? Do i have to use 1-wire?

[Rasmus7700]

It would be nice if it was possible to integrate a lot of cheap Input/Outputs to the KNX installation.. The Arduino has a lot of different sensors, for allmost no money - otherwise KNX sensors costs a fortune

[2ndsky]

Look at this thread from Thorsten: https://knx-user-forum.de/diy-do-you...no-am-knx.html

AFAIK there is no Arduino specific project for sh.py

[Rasmus7700]

Okay.. That's sad... So the only thing to do, is use the 1-Wire interface to sensors?

[2ndsky]

You can contribute to the project from Thorsten and add a Arduino with attached sensors directly to the KNX and receive the values from the sonsors in sh.py via the standard KNX plugin or you create your own plugin for sh.py to use the Arduino sensors directly somehow.

[Rasmus7700]

Now i've read all the post i Thorstens thread - seems like a very interesting project they are doing

But, what about this:
Cooking Hacks - Documentation - Raspberry Pi to Arduino shields connection bridge

Seems a bit more simple, mounting a shiels on the PI and then some librarys and then have access to a million of different sensors - would it be possible to use theese sensor inputs in the logic programming of Smarthome.py? Seems pretty easy to get the arduino-raspberry shield to work, but i'm more concerned about connecting it to Smarthome.py - during my weak linux knowledge

[2ndsky]

First of all, what kind of sensors do you need? There are a lot of good 1Wire sensors already supported by sh.py. The advantage of 1Wire is, that the sensors can be 100m away from the Pi... if you use that Arduino sensors, how do you connect them to the Pi? How many sensors can you use with one Pi? What is the topology (bus or star)? If I were you, I wouldn't invest too much if you could just use 1Wire sensors.

[Rasmus7700]

Okay... That's true, it doesn't make any sense to use another interface, if the 1wire sensors works like a charm and allready is integrated... I was just thinking normal switches ON/OFF, Temperature, Hummidity, LUX, Wind and maybe som Relay outputs?

[2ndsky]

AFAIK humidity, temperature and lux is no problem with 1Wire. Wind in my opinion should be implemented directly in the KNX bus for safty reasons. The same is true for switching sensors and relays. There are I/O 1Wire devices from elabNET and AFAIK they're supported by sh.py but if, I would just use them for non critical stuff.

EDIT: look here for the I/O 1Wire devices: http://shop.wiregate.de/multi-io.html
elabNET works closely together with Marcus to get their sensors supported by sh.py

[Rasmus7700]

I was just planning to use sensors for fun, like measure lux in different rooms and make the motion sensors react after that - so no critical stuff at all Today i'm connecting theese with a Siemens PLC, but PLC's and KNX isn't the best combination but an easy way to expand IO

[2ndsky]

I was just planning to use sensors for fun, like measure lux in different rooms and make the motion sensors react after that

why don't you use the built in lux sensors? Almost every motion detector has them to switch the light on only if it is dark. And the most of them can send the lux value also to KNX.

[Rasmus7700]

Cause i use my Alarm Motion sensors for it all - and they are not on the KNX, but only digital ON/OFF - they are also pet immune, so my pets can't turn on the light when using them

[2ndsky]

The pet immunity is a good reason, I would love to have KNX motion detectors which are really pet immune

But especially for that, the 1Wire sensors are great. If you use the multisensor e.g. they have temperature, humidity and lux. The advanced multisensor has additional I/Os.

[Rasmus7700]

The pet immunity is a good reason, I would love to have KNX motion detectors which are really pet immune

But especially for that, the 1Wire sensors are great. If you use the multisensor e.g. they have temperature, humidity and lux. The advanced multisensor has additional I/Os.

Yep, but the pet immunity is then on behavour of all the smart things like LUX and logics

[Rasmus7700]

What would it take, to integrate
Cooking Hacks - Documentation - Raspberry Pi to Arduino shields connection bridge

In the homeserver.py? I mean, the sensor inputs comes directly in the PI, the question is only to make a link so that hs.py can access them?