The project is at a very early stage of development. You can see the status of this and other nodes from my work panel (In Spanish)

You can give your opinion in the forum while I design it, I receive the materials, and I assemble the test units.

If someone asks, the PCB has a hump because there was free space and I added a AVRISP+UART adapter.

It is a sensor powered by 2 AA batteries or 1 CR2032 battery, it integrates a temperature, humidity and light sensor. It also has two pins for a magnetic push-button in crystal housing and 3 expansion connectors.

Characteristics:

• ATmega328P 3.3V 1Mhz/8Mhz
• NRF24L01 SMD
• ATSHA204A
• FLASH W25X40CLSNIG
• HTU21D
• BH1750
• Blue LED PWM
• ISP + UART programming connector
• 2xAA or 1xCR2032 battery