reading temperature with DHT11 and sending the data to a (local) blynk server using a SIM800 GSM board to send a warning when temperature drops below zero degrees or when a button gets pushed on the blynk

blynk by blynk (http://www.blynk.cc)
blynklib by danicampora ( https://github.com/wipy/wipy/blob/master/lib/blynk/BlynkLib.py )
untplib by andrewmk ( https://github.com/andrewmk/untplib )
DHT decoder by RinusW (http://forum.micropython.org/viewtopic.php?t=1392)
(inexpensive) SIM800L GPRS GSM Module SIM Board QUAD BAND Antenna for MCU Arduino (and wipy, ...)
mashup by me andre@andrehtemac.be
todo sim800 communication needs more work
2016/03/12 : version 0.1