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#1  

Did you mean "Is there an easy way to connect a relay module to the EZ-B"?

If so then yes. Look for Josh's Saltwater Tank project, he has used some relays on that. From memory he used a TIP transistor circuit to energise the relay.

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United Arab Emr
#2  

Or you can simply buy a ready made module that is opto-coupled and isolated. You may connect it to any digital output from EZB

Module with 2 relays