HomeSpan Powered, Homekit Compatible Temperature and Humidity Sensor for ESP32 with the Arduino framework.
With thanks to the HomeSpan project.
This is an implementation of HomeSpan TempSensor I2C modified for HTU21D i2c sensor. (!! Shamelessly plagiarised and only slightly modified from: https://github.com/HomeSpan/TempSensorI2C)
Wrangling of the sensor thanks to SparkFun
Based on a ESP32 DoItV2 Development board. HTU21D Humidity and Temperature sensor - i2c 2 10k resistors.
| GPIO | Connection |
|---|---|
| 2 | Onboard LED |
| 0 | Onboard Button (also used for program upload) |
| 21 | SDA |
| 22 | SCL |
Be sure to tie the SDA and SCL lines HIGH (+3.3v) with the 10k Resistors. This dramatically improved the reliability of reading my sensor which is connected via a 1.5m cable.