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ESP32, SunDuino and temperature/humidity sensor Si7021 (HTU21)Print

Other article about ESP32, with using of development board of SunDuino ESP32 and temperature/humidity sensor Si7021 (HTU21).

I recommend the first article about ESP32 and SunDuino ESP32 which is available on

Thank for ESP32.
I thank designer of SunDuino ESP32 board.

Other parts with ESP32:
ESP32 and Arduino IDE
ESP32, SunDuino and temperature/humidity sensor Si7021 (HTU21)
ESP32, SunDuino - temperature/humidity Si7021 sensor and OLED 128x64px (I2C)

The installation of library for temperature/humidity sensor - Si7021 is very easy and you find it on and github of SparkFun

The pinout of SunDuino, ESP32 is below. I2C bus is connected to 21 (SDA) and 22 (SCL). Of course you connect sensor to GND and 3V3.

After installation of library for Si7021 you will see in File -> SparkFun Si7021 Humidity and Temperature Sensor, SparkFun_Si7021_Brekout_Example example code. I edited it. Edited code you find on my github

During the uploading of your code you will see this warning message "WARNING: library Wire claims to run on [esp32] architecture(s) and may be incompatible with your current board which runs on [DFRobot_FireBeetle-ESP32] architecture(s)."
It's not important now.

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