Environmental sensor

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This is a small, lower power environment sensor based on Bosch's BME280 sensor, STM32L062 MCU, and Nordic NRF24L01+ short-range 2.4GHz radio. Multiple sensor boards transmit periodic readings to a local relay unit which packages received metrics and forwards them via TCP/IP to a data collection system via Wifi. The radio-to-internet relay is based on the ESP32 platform and uses both a NRF24L01+ radio and the ESP32's onboard Wifi.

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