The emonTH V2 is an open-source, wireless, battery powered temperature and humidity monitoring node. It is an easy to deploy tool for monitoring building / room temperature and humidity. Data from the emonTH is transmitted via wireless RF (433MHz) to an emonPi / emonBase web-connected base-station for logging to Emoncms for data logging, processing and graphing. Room temperature and humidity data can be used to inform a heating control system, feed into a building performance model or simply for general interest!
Temperature and humidity sensing - using the onboard Si7021 temperature and humidity sensor and (optionally) an external DS18B20 temperature sensor.
Si7021 (emonTH V2) Vs. DHT22 (emonTH V1) comparison