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Topic: Room control (Read 4 times) previous topic - next topic

niner

#5
Feb 12, 2013, 06:15 pm Last Edit: Feb 12, 2013, 06:22 pm by niner Reason: 1

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niner wrote:
What I want to achieve ....

Unfortunately, I am confused with the total lack of your clarity in describing what you want to achieve.

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niner also wrote:
I can't connect it with ethernet as it would look ugly and wife shield is not economical (?)

You can't connect or you prefer not to connect?
Yes, a 'wife shield' is not so economical, but a wife, well, she is very useful and beautiful too, especially compared to the 'ugly' ethernet!
I am guessing English is not your preferred language?

If you are going to be playing around with AC as you mentioned, and if that is mains voltage AC, then you better get very clear about what you are wanting to achieve and how you will do this. Understand the risks involved with mains voltage or do not even attempt this if you have no skills or understanding.

Paul


I meant wifi, friggin' auto correct.
Sorry for not being clear enough.
Question 1 : I want the arduino to do the task of switching the lights and fans on and off (like a normal switch) according to the input it receives from the bluetooth module. Can I do this with the help of a simple 5V relay?
Question 2 : How can I use AC to give the arduino high/low input? When main switch is on high, when off low? Like the sensors we use with DC?
Thanks

niner


Everything that rockwallaby said as well as:  There are devices out there that you can control the mains with that are relatively safe, but for us to suggest them, you need to be a little more clear on what you want to do.  The ceiling fan, can you point us to an example?  What is your mains voltage?  If you're using CFL lights or not.  Do you only want to control the lights and fan?  What kind of fan controller do you have.  etc.

For example this device can be used to control mains connected devices with an Arduino: https://www.adafruit.com/products/268
And there are ways to adapt various remote devices to being controlled by an arduino.  So, is your fan remote controlled?

These are the kinds of things that you need to think about and describe to us so we can make reasonable suggestions.


I will just use the arduino to switch things on and off.
One switch, one fan, one CFL, one tubelight, all this from the already present switch board.

draythomp

OK, a relay can switch AC (mains) current as well as DC.  You will need to consider the current and voltage ratings of the relay contacts you want to use as well as the current draw of the relay coil.  Some of those little relay boards for the arduino pull a lot of power when you have two or three of them activated and it can suck down your power supply.  Most of the relays will run the lights and the fan.  Ceiling fans use less than 100 watts and CFL lights or fluorescent tubes are less than that also, so a relay that has contacts that can handle a couple of amps will do fine. 

The problem that is difficult to overcome is having your wall switch work as well as the arduino.  For example, you can turn the lights on from the switch, then turn them off from the remote control.  But then, when you want to turn them on from the switch again, it won't work.  This takes special wiring considerations.  This kind of thing is exactly like the lights in a hallway with a switch at each end; there are things you have to do special to make it work.

Ceiling fans are the same basic way.  If your control of the fan means you want to vary the speed as well, there are special things you have to do.  If you have a remote control for the fan, you can leverage the remote such that the arduino can do things with it.
Trying to keep my house under control http://www.desert-home.com/

spatula

Quote
niner wrote:
Question 2 : How can I use AC to give the arduino high/low input? When main switch is on high, when off low? Like the sensors we use with DC?
Thanks


DON'T DO THAT

Please understand the difference between using and Arduino to control a 5V relay used as a switch for the mains AC (the two circuits are isolated, you may figure the Arduino pressing a button) and feeding 220V AC into the Arduino. You don't need to apologize for your English but you need to understand what we are telling you.

Quote
rockwallaby wrote:
If you are going to be playing around with AC as you mentioned, and if that is mains voltage AC, then you better get very clear about what you are wanting to achieve and how you will do this. Understand the risks involved with mains voltage or do not even attempt this if you have no skills or understanding.



draythomp

Quote
Question 2 : How can I use AC to give the arduino high/low input? When main switch is on high, when off low? Like the sensors we use with DC?


As previously pointed out, you can't just connect it.  However, I don't think that's what you meant.  You probably want to know how to sample to see if mains voltage is available somewhere (like after a switch).  Here's a pretty good way to do it, and it can be done pretty safely this way:

http://www.simple-electronics.com/2012/02/isolated-ac-power-line-interface.html


Trying to keep my house under control http://www.desert-home.com/

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