Arduino Mega 2560 with ethernet shield, 16x2 I2C LCD, RTC DS3231, SD card datalogger, two DHT22 sensors and two DS18B20 sensors
Monitor der PV Anlage Speicherung der Wetterdaten von openweathermap.org für Cloudiness, Temperatur und WetterId und Wetterbeschreibung in den Channel Status WetterId Bedeutung siehe http://openweathermap.org/weather-conditions
Using an ESP8266 ESP-01 module and an Arduino Pro Mini 3.3V I wirelessly update all outputs from my thermostat to here for data analysis and because it's cool. This requires a voltage divided rectifier since thermostats run at least 24 VAC RMS.
Sump Pump failure alarm... Detect flooding of basement. reading is from floor to sensor.