Arduino + 220v

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Jok:
How would one proceed controlling a 220v 2A source? Relay would seem natural but 5v wont really do much for most relays and I only have relays for 9v and 12v laying around that can do 220v. So does anyone have an idea how to either drive the 9v/12v relay or another way of turning 220v on and off with a digital port on the arduino?

Grumpy_Mike:
I know it says motors but try this:-

http://www.thebox.myzen.co.uk/Workshop/Motors_1.html

However, for direct 5V control I would use a solid state relay.

AWOL:
Quote

So does anyone have an idea how to either drive the 9v/12v relay
You could probably get a reed relay with an operating current of 10 or 20mA so direct-drive capable, and use the contacts of that to drive a higher-powered relay.
But an SSR is preferable.

capt.tagon:
Use a solid state relay, for 220VAC you have a manufactured circuit that will be safe to implement.

Optek OSSRD1001A -- OSSRD1006A are though hole mount SIP units for 250VAC from 3A to 40A Max Current
Inputs for the above are 5-12Vdc with a minimum output current on all at 0.05 A

Optek OSSRD0001A -- OSSRD0004A are panel mount units with screw terminals capable of handling 250VAC  from 10A to 40A Max Current
Inputs for the above are 4-32Vdc with a minimum output current on all at 0.05 A

http://www.optekinc.com/viewparts.aspx?categoryID=70

To drive the current relays you have, you could use a Darlington opto-isolator. Make sure you have a reversed diode across the relay to suppess the collapse current.

Here's the standard circuit using a common TIP-102/120 for higher current coils -> http://www.arduino.cc/playground/uploads/Learning/relays.pdf

FrankRadio:
That is realy easy, use any relay you want, 12V 9V 5V or what ever.
Using any NPN transistor, EJ: 2n2222, bc548 any.

                      RELAY- VCC (12,9,5 etc)
                      RELAY-COLECTOR

Arduino I/O ----2K2----BASE :o
                  
                      GND---EMITER

Best Regards
Frank

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