HCW-M135 MOSFET DC Timer and Switch

[Zilla]

This is a great little timer board. Applications are the control of DC pumps, Dosing Pumps and Auto Top Off using Trigger Input.

I designed a case for it and STL Files can be found here -> https://www.thingiverse.com/thing:7176909

 

[Rocks reef]

Very interesting! Could you explain a little more of what it is able to do and/or control?

 

[Zilla]

The HCW-M135 timer module has an adjustable delay range of 0.1 Seconds to 999 minutes.
Both on time and off time are separately programmable.
Voltage range 6-30v
It has a trigger input that could be connected to a auto top off sensor, triggering it to come on when float valve changes state. Instead of just flooding tank it could be set to run for just a second or two before needing retriggered.
There's a 5v regulator on the board. If you need 5v for something other than the input voltage, you can tap into that.
It keeps settings after power cycle in non volatile memory.
Google AI gives a pretty good explanation of programming it.