Datasheet

Connect Vdd to the power supply, 3V or 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 MCP9808 has a default I2C address of 0x18 but you can set the address to any of 8

values between 0x18 and 0x1F so you can have up to 8 of these sensors all sharing the

same SCL/SDA pins.

Download Adafruit_MCP9808

To begin reading sensor data, you will need to download Adafruit_MCP9808 from our github

repository (http://adafru.it/dfP). You can do that by visiting the github repo and manually

downloading or, easier, just click this button to download the zip

Download Adafruit MCP9808

Library

http://adafru.it/dfQ

Rename the uncompressed folder Adafruit_MCP9808 and check that the

Adafruit_MCP9808 folder contains Adafruit_MCP9808.cpp and

Adafruit_MCP9808.h

Place the Adafruit_MCP9808 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 (http://adafru.it/aYM)

Load Demo

Open up File->Examples->Adafruit_MCP9808->mcp9808test and upload to your

Arduino wired up to the sensor

https://learn.adafruit.com/adafruit-mcp9808-precision-i2c-temperature-

sensor-guide

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