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Hey! Good job on the weather station. I was thinking you could reduce the power consumption on the DFRobot Gravity - I2C BME280 by removing the red led indicator. On the NodeMcu there is a hack that can make it run on µA instead of ma. Maybe this would be of interest to you. https://tinker.yeoman.com.au/2016/05/29/running-nodemcu-on-a-battery-esp8266-low-power-consumption-revisited/.