Freezer-to-Frigidaire, ESP8266 powered freezer cell periodically shut down to stay within typical refrigerator temperature range (e.g. 2 to 5°C) A DHT22 inside the freezer is polled and a 5V relay and a cascaded BIG 220v SSR are switched accordingly.

Temperature and humidity logging of our ICT office

Testing data from DHT22 and esp8266 wifi module.

data from main unit sensors

data from remote unit

Room temperature,humidity and heat index test DHT22 sensor and ESP8266

Using a raspberry pi b+ GPIO pins and python I constructed a 15 sec updating feed from a DHT22 humidity sensor, and two DB20S18 temperature sensors to give an outside temperature and humidity and inside temperature every 15 seconds to Thingspeak

Particle Photon Board

Particle Photon DHT22 DataStream

ESP8266 only temperature monitor of house in Kent, UK