This board is an extended version of Button size radionode which is probably the smallest node you can find!
I decided to produce this node exactly in this version, because you can easily get the previous version of the board using scissors.
Very small board. Only 21x21mm and as thin as possible + 21x21mm extension.
Well designed power, ready to use with unregulated rough power source up to 6V or battery.
CR2032 battery holder
A lot of sensors (temperature\humidity SI7021, preassure BMP180, light BH1750 and light\UV SI1132). In the first batch of boards I will solder two sensors - temperature\humidity SI7021 and light\UV SI1132.