I'm trying to connect RPI3 direct to relay board. In hardware settings pin5 . But GPIO5 startsup high and will not get low.
you can refer to this:
https://hydrosys4.wixsite.com/hydrosys4forum/forum/sw-and-settings/how-to-change-relay-high-low-value/p-1/dl-5eda7f9200854e0017bedfa7