Wemos-D1 mini ESP8266 WiFi MQTT SHT30 temperature and humidity sensor

Arduino firmware for the Wemos D1 Mini (ESP8266) and the SHT30 temperature and humidity sensor shield

Update: FWIW, you can now use ESPHome on this hardware. It's a much more complete solution that connects to Home Assistant. I must remember to update this with a guide to how to deploy the firmware when I next try it.

Uses:

The Wemos D1 mini ESP8266 dev board: https://wiki.wemos.cc/products:d1:d1_mini

The SHT30 sheild: https://wiki.wemos.cc/products:d1_mini_shields:sht30_shield

An mqtt server

A backend to make use of the mqtt temperature and humidity messages.

Messages have the following format:

{"location":"lounge","temperature":23.25628,"humditiy":57.82254} {"location":"office","temperature":24.01465,"humditiy":56.94514}

Location and WiFi login details are all set in firmware and uploaded to each node.

To compile the Arduino code, you will need to install the following boards and libraries:

Board

Add the following to 'Preferences -> Additional Boards Manager URLs' https://arduino.esp8266.com/stable/package_esp8266com_index.json

Then in 'Tools -> Board -> Boards Manager' install the esp8266 'ESP8266 Community' boards package (tested with v3.0.2)

Libraries

PubSubClient by Nick O'Leary (Tested with v2.8.0) ArduinoJson by Benoit Blanchon (Tested with v6.19.4) WEMOS_SHT3X by wemos https://github.com/wemos/WEMOS_SHT3x_Arduino_Library