Having a weather station at home is very useful. The most important information is the indoor temperature. Required parts * WeMos D1 mini (ESP8266) * DS18B20: digital thermometer * MAX7221: LED display driver * 7 segments LED: 4 digits common cathode * 4.7 kΩ resistor: 1-Wire pull-up resistor * 10 kΩ resistor: LED brightness * Micro