2021 Jun 22, 03:40 PM
(This post was last modified: 2021 Jun 22, 03:43 PM by astrogerard.)
You should connect VCC (next to the data pins) on the relay board to 5v. This is needed because the opto en led are connected to vcc and will light up when the datapin is pulled low.
--Gerard
For details on the use of a relay board see: this
--Gerard
For details on the use of a relay board see: this