This project is using the ESP-07 module to drive an RS232 interface via a MAX232. Pretty simple, but it should allow devices with a serial interface (like a projector) to be accessed via the network.
Programming happens via the same RS232 port, there are small reset and program buttons. I also added the option whether you want a device or host serial interface (crossover of the RX/TX lines).
All GPIOs and the ADC are broken out to regular 2.54mm pin headers. Power supply is 5-12V via a barrel jack.
The board is designed to use only one layer, so it should be possible to etch this at home (if you can manage the TSSOP footprint).
Enjoy this project?