What type of RF I can use

denisj · Post by **denisj** » Saturday 17 December 2016 13:29

Hi there,
and for first post in this forum ... congratulations for this wonderful software !!!

I just begin to install the domoticz in my rasp and I want to buy a RF interface in order to begin to play

There is a lot of RF transceiver on market... so I want to ask witch is better for my case please

Here is what I must do via domoticz:
-send/receive from arduino (I will need about 6 arduino sensors)
-receive the RF info from OWH Intuition that monitor my photo-voltaic panels (i believe is 433Mhs freq)
-send RF to my gate in order to open(433Mhz)
-receive if possible RF from my alarm sensors around my house

I read many peoples use the RFLink... but I don't understand, this is an interface that I must buy ?
or I just can buy only the transceivers and linked to my raspberry and arduino ?

Thanks a lot
Denis

CaesarPL · Post by **CaesarPL** » Saturday 17 December 2016 17:03

Hi!

To confirm some things:
- RF receiver and transmitter is one thing. Catching/decoding and understanding signals is completely different thing. And this is what RFLink or RFXCOM do - they have set of codes or routines to send/receive from different equipment
- OWL does work with RFLink and RFXCOM
- I think that opening gate will not be possible as they have rolling codes which are not so easy to catch. Otherwise it will be relatively to copy this signal and open your gate by someone else. Correct me if I'm wrong
- If your alarm is wireless and working on 433MHz - this is highly possible that it will be compatible

You do not need separate RF transceivers on every Arduino. People rather tend to use e.g. ESP8266 and connect them.

At least this is what I think...

denisj · Post by **denisj** » Saturday 17 December 2016 17:17

Thanks for the answer Cesar
I fount a ESP8266 module on amazon ... but if I understand
the ESP8266 is a wifi module and the raspberry already have a wifi module.

I think I need to make my arduino/raspberry/etc network on the 433Mhz freq.

On your signature I see the RFLink hardware ... witch one you have please ?

Thanks again
Denis

CaesarPL · Post by **CaesarPL** » Saturday 17 December 2016 23:46

I have this version: https://www.nodo-shop.nl/en/rflink-gate ... tenna.html

What do you want to connect to Arduinos? What do you want to measure?

In my case RFLink is only sending signals to remote switches, getting some data from wireless temperature modules (from weather stations) and alarming in case of smoke (FA20RF). Generally - 433MHz is not the best in case of home automation (e.g. I don't know what is the status of remote switch), but it's cheap in the very beginning and for tests.

denisj · Post by **denisj** » Sunday 18 December 2016 7:51

I just want to connect for now my raspberry to arduino ...just for test

So I can bui the arduino kit from the shop of you link... and thank you

But how can I connect the rflink to my raspberry please ?

Thanks again
Denis

CaesarPL · Post by **CaesarPL** » Sunday 18 December 2016 14:38

You do it by plugging USB cable to USB port.

denisj · Post by **denisj** » Sunday 18 December 2016 16:19

Sorry... plug the USB cable of what ...to the USB port of what ?

Thanks again
Denis

denisj · Post by **denisj** » Sunday 18 December 2016 17:24

I understand now ...
Is strange, but if I understand that in order to use the RFLink with raspberry, you need another arduino that will be connected
via USB to that raspberry ... is this true ?

Thanks again
Denis

SweetPants · Post by **SweetPants** » Sunday 18 December 2016 17:51

The RFLink in fact is a standard Arduino Mega 2560 with a piggy-back board containig the transmitter(s)/Receiver(s). The 2560 is connected to the USB of the Raspberry. Take a look at http://www.nemcon.nl/blog2/ for more details on RFLink

denisj · Post by **denisj** » Sunday 18 December 2016 18:00

Thanks for the answer SweetPants, sorry but I discover only today this wonderful Domoticz.

But I have a question if I can please... why we must use an arduino in order to connect
the raspberry via RF ? I so around a lot of schema on how to connect an RF hardware directly on raspberry.

I mean ... what an arduino can do that the raspberry can not please ?

Thanks again
Denis

SweetPants · Post by **SweetPants** » Sunday 18 December 2016 18:13

denisj wrote:I mean ... what an arduino can do that the raspberry can not please ?

Maybe the raspberry can, but how are you going to connect it with domoticz? Are you going to write your own hardware interface to the domoticz software? Domoticz supports standard hardware like RFXcom, RFlink, MySensors, Philips Hue etc etc. How are you going to do this on Windows, or synology NAS?

Stuntteam · Post by **Stuntteam** » Sunday 18 December 2016 18:20

RFlink is roughly a set of RF modules and a processor board (Arduino Mega) that takes care of decoding and converting the RF signals to something that the home automation software (Domoticz) can work with.

If you use a Pi to run Domoticz, then you still need/use an Arduino for RFlink. You are right that the Pi could do this function as well. However, RFLink is designed on the Arduino because it is cheap (5 euro on Aliexpress) and can be connected to any platform via USB. Also, if the Pi is busy with a lot of tasks it might not have time to do the RF handling..
Also, if you run Domoticz on a PC/NUC then you would not want to use a Pi just for the RF part..
We thought that the 5 euro extra to have a great working RF gateway is hardly a problem if you want to set up a reliable and smooth working system.

denisj · Post by **denisj** » Sunday 18 December 2016 18:29

Thanks for the answer.

I have just buy a raspberry yesterday, I will use this one.

I think is strange that for this big work like domoticz, there is still no drivers for a normal
RF component directly from raspberry.
Or... maybe the guys from RFlink can do it.
Anyway... I will buy an RFlink also

But I think will be a good idea to develop a driver for RFLink also for the raspberry ...not because for the money
but because of the space and the box... will be nice to have a raspberry box with just an antenna out of the box

I just have a question... I will make some arduino sensors around my house,
so I will need to read via RF from some numbers of arduino to rapberry/RFLink (in Domoticz)
My question is... do I need the RFLink also on the arduino sensors ? or I can just put there a little usual 433Mhz RF ?

Thanks a lot
Denis

Stuntteam · Post by **Stuntteam** » Sunday 18 December 2016 18:33

The Pi is pretty poor when it comes to RF noise.. that is one of the reasons why just using a Pi is not the best solution..

You only need 1 RFLink.. it can read for a whole range of sensors/protocols.

denisj · Post by **denisj** » Sunday 18 December 2016 18:36

Great

Thanks a lot for all information

Denis

SweetPants · Post by **SweetPants** » Sunday 18 December 2016 18:38

denisj wrote:I just have a question... I will make some arduino sensors around my house,
so I will need to read via RF from some numbers of arduino to rapberry/RFLink (in Domoticz)
My question is... do I need the RFLink also on the arduino sensors ? or I can just put there a little usual 433Mhz RF ?

Again this depends on the support for your device by RFLink or any transceiver. If you want to make your own sensors, take a look at https://www.mysensors.org project, but again this also needs a MySensors gateway to interface to Domoticz.

denisj · Post by **denisj** » Sunday 18 December 2016 18:48

No no ...I prefer the RFLink
If I understand it have a lot of possibility.

I also will want to read my OWL Intuition monitoring of 2 X photovoltaic system on my house.
And if I understand the RFLink can read this (I so it on device list)

What I don't know for now is what type of RF module I must buy for the other arduino thai I will use.
I will need some pieces in my garden also... that must send some info to the RFLink.

I allready have some like arduino modules ...
jeenode (http://www.digitalsmarties.net/products/jeenode) with on board a 433Mhz
This one can be find from RFLink please ?
Thanks again
Denis

SweetPants · Post by **SweetPants** » Sunday 18 December 2016 18:52

denisj wrote:This one can be find from RFLink please ?

If it is in http://www.nemcon.nl/blog2/2015/07/devlist

denisj · Post by **denisj** » Sunday 18 December 2016 18:54

There is not arduino in the device list

SweetPants · Post by **SweetPants** » Sunday 18 December 2016 19:31

denisj wrote:There is not arduino in the device list

Well there is your answer.

What type of RF I can use

What type of RF I can use

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