When attached directly to your Raspberry Pi Zero
(or compatible board) the GPIO pin numbers
corresponding to relays 1-4 are: 16, 17, 22, 23. You
must configure these GPIO’s
for output in order to
control the relays.
For code examples and more info please visit
https://qec.company/products/eas-rel-4
* Raspberry Pi is a trademark of Raspberry Pi Trading