I'd like to use the following relay board with the digital outputs on the Due: http://www.sainsmart.com/arduino/arduino-components/relays/4-channel-5v-relay-module-for-pic-arm-avr-dsp-arduino-msp430-ttl-logic.html
I've googled and heard both ways, i.e. some people say that 3.3V is not enough, others say it is, and the other part is that I can't find the input current for the optocoupler (and don't know what they are, typically). So, the question is, can I use the 3.3V digital pins with this board as is, or do I need additional circuitry? I was looking at a logic level converter, or just a resistor and transistor.
Thanks for the help.