At the time of writing this (end Dec 2016), there have been three prototyping rounds for the new JeeNode Zero. The current “rev3” board is getting close to the intended final release - the STM32L052 µC is a good choice, and due to STM’s impressive chip compatibility, the same PCB can be used with a variety of other lower-cost or higher-performance chips.
There’s an optional CR2032 coin cell holder on board, which sets the stage for a very small self-contained Wireless Sensor Node.
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