I am trying to switch this relay https://www.sparkfun.com/products/10924 . I don't think a schematic is necessary so i'll just explain it. I have my that relay with GND to GND and the signal or vcc or whatever you want to call it pin hooked up to a digital out pin on the arduino, and the pin is writing high then low every 1 second, just to test it. then i have a positive current running through the relay, that should be switched on and off with a one second delay powering an LED, but it isn't switching, it remains closed. i have heard that it is because the arduino's digital write high voltage isn't enough to switch the relay, but i'm not sure because it was switching my 10A relay jsut fine. Ideas? I realize there is a datasheet but im still new to this kind of stuff so i don't really know what any of it means.
