Four Channel Assassins creed 2 forum Shields using a Separate Supply An example of this type of relay shield is the DFROBOT Relay Shield for Arduino V2. When operating all 4 relays it should be powered by 9V applied to the screw terminal on the left of the picture. By default the relays assassins creed 2 forum controlled by D2, D7, D8 and D10. Assaassins Itead Bluetooth Shield used in Design Custom menus to switch Arduino outputs on and off uses D2 as an output sony firmware updates
be default freed 3 relays can be driven if you use that Bluetooth Shield. However the DFROBOT relay shield can be configured to use any Arduino digital output to drive the relays. It also includes an Xbee socket so you can plug in an RN-42XV Bluetooth or RN-XV Wifi module and configure the jumpers to work with it. Note in this case you should cut off the reset pin from the relay shield as it is driven by the RS-232 flow control on the Xbee fofum.