I'm going to buy two 16 channels relay boards from Sainsmart : http://www.sainsmart.com/16-channel-12v-relay-module-for-pic-arm-avr-dsp-arduino-msp430-ttl-logic.html
I want to control it with a SBC66EC (modtronix.com/sbc66ec.html?sef_rewrite=1¤cy=EUR) which has 32 3.3V I/O.
The relay board must be powered with an 12v alim. My question is : can i control the relay board with 3.3V GPIOs because of the Optocouplers of the relay board ? There is a lot of different theories on the web ... I'm a bit lost as i'm not specialized in electronic/electricity.
Here is the schematic of the relay board : https://www.dropbox.com/s/pm2p3q04sj65x5e/16ch%20schematic.pdf?dl=0