User Manual

Arduino Code

Arduino Wiring

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 - once the low level i2c functions are adapted the rest should 'fall into

place'

(https://adafru.it/dBn)

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

Connect the RST pin to digital 12 - you can change this later but we want to match the tutorial for now

The Si4713 has a default I2C address of 0x63 - you can change it to 0x11 by connecting CS to ground but don't do that

yet! Get the demo working first before making changes

Download Adafruit_Si4713

To begin reading sensor data, you will need to download Adafruit_Si4713 Library from our github

repository (https://adafru.it/dBp). You can do that by visiting the github repo and manually downloading or, easier, just

click this button to download the zip

https://adafru.it/dBq

Rename the uncompressed folder Adafruit_Si4713 and check that the Adafruit_Si4713 folder contains

Adafruit_Si4713.cpp and Adafruit_Si4713.h

Place the Adafruit_Si4713 library folder your arduinosketchfolder/libraries/ folder.

You may need to create the libraries subfolder if its your first library. Restart the IDE.

We also have a great tutorial on Arduino library installation at:

http://learn.adafruit.com/adafruit-all-about-arduino-libraries-install-use (https://adafru.it/aYM)

Load Demo

Open up File->Examples->Adafruit_Si4713->HTU21DFtest and upload to your Arduino wired up to the sensor

(https://adafru.it/pOA)