Arduino Internet Controlled Desk Lamp

Step 3: The circuit

Connect everything as shown in the image.
Connect the base of the transistor to the pin used in the code I used pin 13

Connect your light bulb in series with switching contacts of the relay.

And connect your arduino to your server.

Comments

[mbtria]

I don't know much about electronic circuits (though I do put in new mains circuits), but am interested in being able to switch 110V circuits (US) where I have power, but no feasible wiring for switching (log home). I was considering using XBee/Arduino for this, but thought that a latching relay would be more appropriate to save battery power. Any comment?

[geo bruce]

sorry I don't fully understand your question
but have a look at x10

[mbtria]

Thank you for taking the time to respond. Sorry if I was obtuse.

I have had X-10 for about 10 years for control, but I hear different things about how long they are going to be in business. I do know that a lot of prices on X-10 equipment are skyrocketing. I lost my bridge between the 110V legs on the 220V mains, and the price is now double what I paid for it.

I was also using Dallas 1-wire tech for sensors, but they seem not to be expanding their line in ways useful to me. And they have dropped a part or two which are critical, so I was thinking about switching to I2C, XBee and Arduino.

My real question is have you ever used a latching (bistable) relay in such a circuit? If so how did it work out, or do you have an opinion on using such a relay?

Thank you again.

[badenuff]

hi Geo Bruce,
quick questions,
1) can i substitute these? 2N3904 for 2N2222; and 1N4007 for 1N4004.
2) is the relay you're using, 6 pin? just want to make sure.

Thanks,
Sean

[geo bruce]

1) yes to both
2) doesn't matter