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I bought a few of these cheap ESP8266-12 modules from eBay. I'm pretty impressed so far with how easy it is to get a simple web server up and running.
Key learnings:
- The module has a number of IO pins which must have set state to run and another state to flash. GPIO0 needs to be tied low to flash.
- Needs hundreds of mA - can't run from USB->RS232 converter power.
- minicom (linux) doesn't send the required CRLF to the module. Have to manually use CTRL+M, CTRL+J
- Needs to be flashed with NodeMCU firmware to use LUA
python esptool.py --port /dev/ttyUSB0 write_flash 0x00000 ../Downloads/nodemcu_integer_0.9.6-dev_20150704.bin