The Si7021 sensor enables accurate temperature and humidity measurements. It is equivalent in terms of characteristics to DHT22. It is a much more compact digital sensor (like the SHT30 used by Wemos for its shield or the Xiaomi temperature sensor) which transmits the measurements via the I2C bus. It will be very easy to integrate into Arduino, ESP8266 and Raspberry Pi projects. It is supported by ESP Easy firmware for ESP8266 WiFi modules.
Technical characteristics of Si7021
- Temperature measuring range: -10°C to +85°C
- Measuring accuracy: +/- 4°C
- Range of humidity measurement: 0 to 80% RH
- Measurement accuracy: +/- 3%
- Supply voltage: 1,9 to 3,6V
- I2C output
Si7021, I2C temperature and humidity measurement Offers
ESP Easy compatible sensors and actuators offers
- This product is available at AliExpress, Banggood, Amazon.com.
- At aliexpress.com you can purchase 1 Set GY-213V-HTU21D IIC I2C Temperature Humidity Sensor Module Replace SHT21 SI7021 HDC1080 Module for only $1.92, which is 86% less than the cost in Amazon.com ($13.99).
- The lowest price of Industrial High Precision Si7021 Humidity Sensor with I2C Interface Arduino - US was obtained on 3 August 2020 3 h 04 min.