After I realized that 6 pins of the ESP-12F are literally unusable, changed the wiring a bit (I was able to keep most of the functionality with minor restrictions) tihs is fully routed and done. But I don't feel particularly good about the layout; I want to make it more compact.
This is an RGBW + WS2812 LED driver with ESP8266 and 3-A DC/DC regulator. There are headers for 3 PIR sensors, so it's possible to detect motion, and also in different sectors (movement direction on corridors).
The way this works is that if you use 12-V LED strips, you must provide 12-ish V at the input. There won't be any conversion, other than the board powering itself (5 V and 3.3 V)
To drive the LED strip, there are 4 MOSFETs, which are driven by an octal buffer (at 5 V) to reduce RDSon.
It's possible to drive WS2812-compatible digital LEDs, (ab)using the I2S output - thanks Charles Lohr. The signal is level shifted to 5 V.
There is also a clock output provided, for the rare but excellent LED strips with synchronous data interface. All these data lines have Schottky diodes to 5 V and to GND, to protect against transients and hotplugging.
If these kind of 5-V powered LED strips are used, the on-board DC/DC can provide up to 3 A current, and the input can be anything between 5 V and 17 V. This makes cabling easier (less current - less copper needed.)
@tbr it's good advice to read the fine manual
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