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Topic: new to arduino - wish to have a wifi controlled water tank heater (Read 3 times) previous topic - next topic

bobmalaria

Yes correct.
You have two circuits. One is the wall socket, the relay 'c' and 'no' connector and the heater
The other (Arduino) circuit has its own power supply and its own ground (e.g. 9V battery).

The only point the two circuits "meet" is the relay where the Arduino part is connected to the relay coil which performs the switching.

Check the links I posted above, especially the second one will make it very clear, it has lots of pictures

e-r-a-n

i read them both, the second one makes its very clear why a relay is the solution for my "project".
my conclusions are that I will buy the following, please advice if soemthing I'll probably need is missing:
1. SSR - 40A: http://www.ebay.com/itm/Solid-State-Relay-SSR-40DA-40A-250V-W-I-O-3-32VDC-24-380VAC-Heat-Sink-/200879972574?pt=LH_DefaultDomain_0&hash=item2ec56120de

2. Arduino kit:
Im actually not sure, (a) seems pretty short with items, (b) is not original arduino i think, but have the battery which is a good thing, and also screen and other things, [c] seems the best option, isnt it? but a tiny breadboard, maybe i should consider something else?
a. http://www.ebay.com/itm/Arduino-Uno-R3-Starter-Kit-Breadboard-Jumpers-cables-LEDs-Resistance-IR-/200864208879?pt=UK_Sound_Vision_Other&hash=item2ec47097ef
b. http://www.ebay.com/itm/Starter-Kit-LCD1602-ATmega-328-arduino-compatible-/280911458775?pt=LH_DefaultDomain_0&hash=item4167a0b1d7
c. http://www.ebay.com/itm/Arduino-Component-Basic-Element-Pack-Set-Kit-Case-For-Arduino-Starter-Beginners-/180824786469?pt=UK_Sound_Vision_Other&hash=item2a19ff4625

I still dont know about wifi card. Its hard to nevigate in ebay beacuse arduino has alot of "compatible" products,
i wish for an original one, with much documentation, so that i will not get lost in the middle and waste money for nothing.
Any suggestions what to look for exactly?
I would go to arduino official website but i need delivery for israel, which is always problematic.

bobmalaria

Hi,

I think the a) set is not bad. The others have a lot of stuff that you probably not need at the moment.
It all really depends on what else you want to do, or if you fancy doing some other pojects in the beginning to learn more about the Arduino.

Relay looks good to me, but since you are in Israel, you may find a similar relay in a local electronic shop or from an israelian distributor?

I do not have any experience with wifi shields, so maybe read around what other projects used. The shield will go on top of your uno and take up some pins but as you only need one additional pin for the relay switching this will not be a problem at all.

e-r-a-n

Ok,
And please tell me one more thing,
I found out about Electric imp, it has already wifi built in, would it go better with my needs or it doesnt really matters?

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