Opto relay wiring.

Hi,
I'm elderly/inexperienced. I'd like to do a simple project.
Project traffic lights. Available leonardo, Terry King 4 relay
opto board.Resistors,led's etc.
This is what I think.
Vcc to arduino +5v. No ground.
Remove jumper. Connect+5v toJD-Vcc and ground.
Connect IN1,2,3&4 to arduino, say pins 9,10,11& 12.
Do I need separate power supplies for arduino and
relay board?
My son in law would do it in a couple of minutes but
I wouldn't learn anything that way!
I want to avoid smoke, so any advice much appreciated.
Thanks John.

Hi John,

Yes, if you are totally optically isolating the relays, you need a separate power supply for the relay board. Any typical 5V "Wall Wart" would be OK..

You can test with just Arduino 5V and the jumper as originally set. The products page says:
---------------------( COPY )---------------------
NOTE: Each relay draws about .08A (80ma) from 5V Vcc so about 4 relays are the maximum you should run from the Arduino +5V supply. (Running from USB it may be less). More than 2 relays: we recommend you use a separate 5V supply for the relays.
-----------------( END COPY )----------------------
And the http://ArduinoInfo.Info wiki has some details here: http://arduino-info.wikispaces.com/ArduinoPower#4-8

Let us know how it goes..

...Elderly but Experienced (Don't ask in What) , Terry