Arduino uno + seeedstudio relay shield + PIR

Hello,

I'm new at arduino world but tried to learn as much as could reading.

About programming I still have enought knowledge but my downside are electronics...

My question is about seedstudio relay shield v2 i bought. Seems like takes it own power from +5V pin to work and the the 4,5,6,7 pin are to control the relays.
I bought this 4 relays shield becouse my project would be more "cute" and small but about electronics i have the following question:

  • I found all websites about for arduino to use Arduino + 1N4001 + BD137 + relay. In this case I understand now i have the board that all is already on the shield so i just have to plug it over arduino uno, program to work with pin 4,5,6,7 as OUTPUT so will switch from COMX-NCX to COMX-NOX right?

-I plan to controll 220v lights on each relay connector, I understand that the relay on this board is powerfull enought. Are the +5V 40mA from Arduino enought to switch relay? ore need more mA?

-Will make a diference to use USB electricity from a 9V power supply in my project??

Thank you very much.

http://www.seeedstudio.com/wiki/Relay_Shield_V2.0

P.D:Sorry about my english

so i just have to plug it over arduino uno

Yes.

program to work with pin 4,5,6,7 as OUTPUT

Yes.

so will switch from COMX-NCX to COMX-NOX right?

I don’t understand this. The relay can be used to open a connection or close a connection. The circuit that the relay controls can be normally open (NO) or normally closed (NC). The “normally” part refers to the state when the relay is not powered.

Are the +5V 40mA from Arduino enought to switch relay?

Yes.

-Will make a diference to use USB electricity from a 9V power supply in my project??

A 9V battery doesn’t supply USB electricity. There is no such thing as USB electricity. The board (and shield) can be powered by the USB cable, delivering normal electricity, or a 9V battery, delivering normal electricity. Though the 9V battery won’t power the Arduino for long. 4 AA batteries are a far better choice.

First of all thx for your answer.

About NO,NC my english sentence was bad... i meant that thx to outputs 4,5,6,7 i will be able to switch Relay so will make it work my lights becouse will be using NO by default becouse normal state of this relay is NC and after "HIGH" the outputs will change relay so power will flow accross NO pin.

Normal electricity input (not the USB one) will be OK with a little power adapter of 9V 1000mA??? for this project? Any recomendation about how to feed arduino correctly? a 12V 1000mA is also ok???

Will have to make it work with 3 standard arduino PIR.