Powering multiple led strips by one switch
There is a logical component &quot;OR&quot; that could be used. What is a logical gate? That is extensivly explained here https://en.wikipedia.org/wiki/Logic_gate



simulate this circuit &ndash; Schematic created using CircuitLab
Another solution is to add the switch to a GPIO on the WeMos and add code, example https://www.arduino.cc/en/Tutorial/BuiltInExamples/Button and if it is a push button please add some &quot;debouncing&quot; code as well, ref. https://www.arduino.cc/en/Tutorial/BuiltInExamples/Debounce
The debounce code is preventing the input from receiving several on/off when the button is pressed. Quote from the Arduino site, Pushbuttons often generate spurious open/close transitions when pressed, due to mechanical and physical issues: these transitions may be read as multiple presses in a very short time fooling the program
Note: Both above suggestions is making the SB540 obsolete.