Other article about, with using of development board ofand temperature/humidity sensorI recommend the first article aboutandwhich is available on https://time4ee.com/articles.php?article_id=43 Thank dfrobot.com for ESP32 I thank designer ofThe installation of library for temperature/humidity sensor - Si7021 is very easy and you find it on https://learn.sparkfun.com/tutorials/si7021-humidity-and-temperature-sensor-hookup-guide and github of SparkFun https://github.com/sparkfun/Si7021_Breakout The pinout ofis below.bus is connected toand. Of course you connect sensor to GND and 3V3.After installation of library foryou will see inexample code. I edited it.During the uploading of your code you will see this warning message "It's not important now.