ZY12PDG

[TimetravelerDD]

The ZY12PDG (so called "industrial grade") appears to be functionally identical to the ZY12PDN only with less components (terminals, buttons etc.)
It may or may not come with the button installed (mine was with button, it sits at the white circle on the PCB)

VBUS = +
GND = -
CC1 and CC2 = every USB-C cable has only one CC-wire. Choose one, it doesn't matter which. (it simply determines the orientation of the USB-C plug which is obviously not present in this case)
Trig = short it to ground to emulate button press

The large solder pads on the back are plus and minus and are directly connected to VBUS and GND. Please note that is the input and output at the same time!

more observations:

• my yellow (9V) looks very green, very hard to discern from the actual green (15V)
• I soldered mine directly to the end of a 65W Thinkpad USB-C Power supply (blue=cc, silver=ground, red=VBUS+)
  it worked very well, however it doesn't support 12V
• oddly it will display the colors exactly in the same order and doesn't skip voltages that are not supported, so that for me first color is 5V=red, 9V=yellow, 15V=green, 20V=lightblue. However in programming mode the colors are accurate according to your info, so that darkblue actually results in 20V (I suspect the ZY12PDN would show the same behavoir)
  -another example: I program it to "light blue" - After the power cycle it correctly results in 15V, but it shows "green"

Therefore I conclude: in programming mode the light color accurately reflects the voltage level listed by you, but in "normal" mode the color is simply incremented for each supported voltage level which is depended on the power source used.
First Voltage = red, second voltage= yellow, etc.

Overall I am very happy with this, even if it took me some time to figure out how it works.

[rorosaurus]

Thanks for this info! I will add it to the readme, if that's okay?

I can confirm your conclusion on the colors working two different ways on the ZY12PDN, depending on what voltages the power supply offers.

[TimetravelerDD]

absolutely, I am happy to contribute.
Feel free to rephrase or rewrite it in any way you see fit, to integrate with the style of the rest