####SHORT DESCRIPTION
Loop through GPIOs to power on/off Sensirion STH21 sensor by order.
Print temperature/hummidity on sh terminal.
Run as a tiny http server and make the temperature/hummidity available by a webpage.
####DEPENDENCIES
libmircohttpd
C++11
####HOW TO RUN
su
./sht21httpd
####TESTING ENV
Hardware: RaspberryPi 3B
OS: Raspbian Jessie with PIXEL 2016-09-23
Adapter: I2C Bus; GPIO 17 27 22 are used, each of them is conected to a VDD_SHT21 pin
######https://github.com/eyiliu/sht21httpd
HAVE FUN