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Post: I found this photo of a relay board that looks very similar to the XSOURCE board and it uses a DPC-817C optocoupler. [url=https://everlightamericas.com/index.php?controller=attachment&id_attachment=4121]Here is the datasheet for the optocoupler.[/url] According to the datasheet, the optocoupler needs a 50mA forward current on the LED so you will need to add a transistor in between the IO Pi output and the relay board input. Looking at the photo of the relay board it looks like the cathode side of the LED is connected to the input pins. You would activate the relay by connecting the input to ground so you will need to use an NPN transistor to switch the inputs. We have a [url=/kb/article/1052/driving-relays-or-higher-loads-with-the-io-pi-plus]tutorial in our knowledge base[/url] on driving relays from the IO Pi using a transistor, you should be able to use the same circuit but instead of connecting the collector on the transistor to the relay, you would connect it to the input on the relay board. This should then allow you to safely activate the optocoupler on the relay board without putting too much load on the IO Pi outputs.