This moduel is an USB adpater
programmer for ESP8266 moduels of type ESP-01.
It is conveniently fitted with a 2x4P
2.54mm female header to plug the ESP01
Note : for an usage with Arduino ESP8266 platform and for Arduino IDE
it is necessary to switch manually the GPIO0 state for working mode,
in order to get a fully automatic upload it is most likely possible,
for a very limited effort, to assign an unused control line
from CH340 to driver the GPIO0 line
(probably at the cost of a necessary logic inversion),
refer to the CH340 datasheet and
most important to the NodeMCU V0.9
which use the CH340 and already implements this solution,
the schematic is open source and easily available.
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