_Unfortunately I can't open my ebay shop right now. While I'm trying to open it, you can buy this board here: https://www.tindie.com/stores/easySensors/ _

I designed this multisensors board for usage in real life (long life, temperature range, radio range...).

Specification

• Dimensions 31mm x 41mm. Fits very nice plastic box.
• Powered from two CR2032 batteries in series with very high efficient power converter (3.5-10V). Double battery holder. JST for external battery.
• Wide temperature range. I expect -30°C - +70°C (UPD. -20°C - 40°C tested).
• Stable 3.3V voltage during all battery lifetime.
• S16-L201D pir, bh1750fvi light, si7021 temperature/humidity sensors are onboard (optional bmp280 sensor footprint)
• Multiradio board. Rfm69cw and nrf24l01 are supported.
• Authentication security - Atmel ATSHA204A Crypto Authentication Chip
• External JDEC EPROM
• Dualoptiboot bootloader. Implements over the air (OTA) firmware update ability
• Battery voltage sensor (via divider, 6v is sensed)
• FTDI header for programming
• Two variants of lens are avaliable. Will test both of them.
• Reverse polarity protection.
• ... :)

Will share all sources after first tests. I hope to produce first batch soon too.