Solar Heaters (3 different boxes that were a science project) are connected in series and are being used as a supplemental heat source for my bedroom. I am using 4 DS18B20 sensors, 1 DHT11, a servo, and 3 fans. These are all being controlled by NodeMCU.
Temperature measurement (°C) inside a 30L/~8 gallons aquarium. Temperature sensor: DS18B20 Microcontroller: NodeMCU v1