hi everyone... im pretty sure i have a million questions floating around here now lol.
my question/s is about supplying more power to the pwm (and the digital out's once i get them working). i currently want/need 12 relays to switch on and off.
the problem is it seems there is only enough juice from the board to power 4 sometimes 5 on at the same time. they are rated at 5v, 106.4 mA each. (im guessing this is because (i think) usb output is limited to 500mA )
if i get a external power supply will this allow all the relays to work by allowing more power to be sent out of the pwm and digi outs (so not reaching the limit of 500ma from the usb)?
and will a 2.5amp (eg. http://www.maplin.co.uk/Module.aspx?ModuleNo=49063) be enough or too much? i dont want to fry the board but am going to need to set up 12 led's to run aswell.
also i will still need to control the arduino from usb... will it auto select the external as the source of power or will it switch to the usb?
thanks for any help peeps.