I’m hitting the complete lock up problem when trying to use the 4-Channel SPDP Relay. Happened upon this post. I’ll give my feedback when done.
First, that tale will make a bit more sense if you reverse the registers
4 3 2 1
---------------
0x00: OFF OFF OFF OFF
0x01: OFF OFF OFF ON
0x02: OFF OFF ON OFF
0x03: OFF OFF ON ON
0x04: OFF ON OFF OFF
0x05: OFF ON OFF ON
0x06: OFF ON ON OFF
0x07: OFF ON ON OFF ON
0x08: ON OFF OFF OFF
0x09: ON OFF OFF ON
0x0a: ON OFF ON OFF
0x0b: ON OFF ON ON
0x0c: ON ON OFF OFF
0x0d: ON ON OFF ON
0x0e: ON ON ON OFF
0x0f: ON ON ON ON
Thanks for the hints.