Reads a temperature & humidity probe (SHT20, SDA on IO21 and SCL on IO22) and sends the data to Home Assistant (or anything else) via MQTT. Hold a button low on IO27 at boot to set the configuration variables. Also sends the current battery voltage read from IO34 via a divider network of 2 x 1M resistors. Config allows you to calibrate the battery voltage by measuring it and entering the real value. Uses a DF Robot Firebeetle ESP32-E board which has the button and battery divider on board, but will operate with any ESP32 if properly compiled.
Copyright 2023 Phillip C Dimond
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
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