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Welcome to the ESP8266 Temperature Humidity Sensor - wiki!
I was fed up with the simple thermo sensors from the discounters which constantly crash after one year and have no way to get their data out of it.
Idea was to integrate into OpeHAB using MQTT as transport protocol.
It's up to you to build a hardware on your own.
You need: ESP8266 : ESP07/12 or Mini. Display: SSD 6630 compatible display Sensor : one of SI7021 | DHT | DS18B20 Power supply 3V
Total costs : < 10 €
Here is my decent implementation:
Download, add the libs noted in the header. ...