This module uses G6K-2P relays - and its design is inspired by Everlanders Automation projects (video) (Project Home page), where a Wemos D1 min wireless remote control option is added to the MaxxFan in the Everlander rig.

In their project G6L-1P relays are used, but they seem to be more expensive than G6K-2P relays, so this PCB is designed for G6K-2P 5V relays.

(See this MaxxFan Module B page if you want to use G6L-1P relays).

Project Status: PCB design verify (rev.A1 - 2023 May 16)

Here are some screen shots:

• TOP side
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• Bottom Side
• 

Notes about un-knowns:

• I do not know if the numbering (1-8) is similar to the actual MaxxFan. This needs verification.

Use the PCB viewer if you would like to see/test the entire copper path as it switches sides and/or connects to several solder points.

• Link to Free download of the Sprint-layout Viewer program
• The PCB design file (Status is: PCB UN-tested)

Chips:

Miniature relay G6K-2P

Datasheet: omron_g6k-2-relay.pdf

ULN2803a Darlington Transistor Array

(Top View)

Datasheet: uln2803a.pdf