Datasheet

Arduino Code

You can easily wire this breakout to any microcontroller, we'll be using an Arduino. For another kind of microcontroller,

just make sure it has I2C, then port the code - its pretty simple stuff!

diagram.fzz Fritzing file

https://adafru.it/rAA

Connect Vin to the power supply, 3-5V is fine. Use the same voltage that the microcontroller logic is based off of.

For most Arduinos, that is 5V

Connect GND to common power/data ground

Connect the SCL pin to the I2C clock SCL pin on your Arduino. On an UNO & '328 based Arduino, this is also

known as A5, on a Mega it is also known as digital 21 and on a Leonardo/Micro, digital 3

Connect the SDA pin to the I2C data SDA pin on your Arduino. On an UNO & '328 based Arduino, this is also

known as A4, on a Mega it is also known as digital 20 and on a Leonardo/Micro, digital 2

The Si7021 has a default I2C address of 0x40 and cannot be changed!

Download Adafruit_Si7021

To begin reading sensor data, you will need to download Adafruit_Si7021 Library from our github repository. You can

do that by visiting the github repo and manually downloading or, easier, just click this button to download the zip