# Adafruit MCP9808 Precision I2C Temperature Sensor Guide ## Overview ![](https://cdn-learn.adafruit.com/assets/assets/000/102/983/medium800/adafruit_products_MCP9808_plugged_in.jpg?1624460731) This I2C digital temperature sensor is one of the more accurate/precise we've ever seen, with a typical accuracy of ±0.25°C over the sensor's -40°C to +125°C range and precision of +0.0625°C. They work great with any microcontroller using standard i2c. There are 3 address pins so you can connect up to 8 to a single I2C bus without address collisions. Best of all, a wide voltage range makes is usable with 2.7V to 5.5V logic! ![](https://cdn-learn.adafruit.com/assets/assets/000/102/984/medium800/adafruit_products_MCP9808_top_header.jpg?1624460817) Unlike the DS18B20, this sensor does not come in through-hole package so we placed this small sensor on a breakout board PCB for easy use. The PCB includes mounting holes, and pull down resistors for the 3 address pins. We even wrote a lovely little library for Arduino that will work with any Arduino compatible. You'll be up and running in 15 minutes or less. ![](https://cdn-learn.adafruit.com/assets/assets/000/102/985/medium800/adafruit_products_MCP9808_STEMMA_side.jpg?1624460833) To get you going fast, we spun up a custom made PCB with the MCP9808 and some supporting circuitry such as pull-up resistors and capacitors, in the[**STEMMA QT** form factor](https://www.adafruit.com/?q=stemma%20qt%20sensor "STEMMA QT form factor"), making them easy to interface with. The [STEMMA QT connectors](https://learn.adafruit.com/introducing-adafruit-stemma-qt/what-is-stemma-qt) on either side are compatible with the [SparkFun Qwiic](https://www.sparkfun.com/qwiic) I2C connectors. This allows you to make solderless connections between your development board and the MCP9808 or to chain them with a wide range of other sensors and accessories using a [**compatible cable**](https://www.adafruit.com/?q=stemma%20qt%20cable). [QT Cable is not included, but we have a variety in the shop](https://www.adafruit.com/?q=stemma+qt+cable&sort=BestMatch). ![](https://cdn-learn.adafruit.com/assets/assets/000/102/986/medium800/adafruit_products_MCP9808_back.jpg?1624460841) - Simple I2C control - Up to 8 on a single I2C bus with adjustable address pins - 0.25°C typical precision over -40°C to 125°C range (0.5°C guaranteed max from -20°C to 100°C) - 0.0625°C resolution - 2.7V to 5.5V power and logic voltage range - Operating Current: 200 μA (typical) Info: ![](https://cdn-learn.adafruit.com/assets/assets/000/015/737/medium800/adafruit_products_1782kit_ORIG.jpg?1396549999) - [Next Page](https://learn.adafruit.com/adafruit-mcp9808-precision-i2c-temperature-sensor-guide/pinouts.md) ## Featured Products ### MCP9808 High Accuracy I2C Temperature Sensor Breakout Board [MCP9808 High Accuracy I2C Temperature Sensor Breakout Board](https://www.adafruit.com/product/1782) This I2C digital temperature sensor is one of the more accurate/precise we've ever seen, with a typical accuracy of ±0.25°C over the sensor's -40°C to +125°C range and precision of +0.0625°C. They work great with any microcontroller using standard i2c. There are... In Stock [Buy Now](https://www.adafruit.com/product/1782) [Related Guides to the Product](https://learn.adafruit.com/products/1782/guides) ### Adafruit MCP9808 High Accuracy I2C Temperature Sensor Breakout [Adafruit MCP9808 High Accuracy I2C Temperature Sensor Breakout](https://www.adafruit.com/product/5027) The MCP9808 digital temperature sensor is one of the more accurate/precise we've ever seen, with a typical accuracy of ±0.25°C over the sensor's -40°C to +125°C range and precision of +0.0625°C. They work great with any microcontroller using standard I2C. With... In Stock [Buy Now](https://www.adafruit.com/product/5027) [Related Guides to the Product](https://learn.adafruit.com/products/5027/guides) ## Related Guides - [Kombucha Thermostat with CircuitPython and Feather ](https://learn.adafruit.com/kombucha-thermostat-with-circuitpython-and-feather.md) - [Monitor PiCam and temperature on a PiTFT via adafruit.io](https://learn.adafruit.com/monitor-picam-and-temperature-on-a-pitft-via-adafruit-dot-io.md) - [Wearable Continuous Temperature Monitor with Adafruit IO](https://learn.adafruit.com/wearable-temperature-monitor.md) - [I2C Addresses and Troublesome Chips](https://learn.adafruit.com/i2c-addresses.md) - [Adafruit Trinkey QT2040](https://learn.adafruit.com/adafruit-trinkey-qt2040.md) - [Adafruit QT Py ESP32 Pico](https://learn.adafruit.com/adafruit-qt-py-esp32-pico.md) - [How to Add a New Sensor or Component to Adafruit IO WipperSnapper](https://learn.adafruit.com/how-to-add-a-new-component-to-adafruit-io-wippersnapper.md) - [Adafruit Feather RP2040 with DVI Output Port](https://learn.adafruit.com/adafruit-feather-rp2040-dvi.md) - [MicroPython Hardware: I2C Devices](https://learn.adafruit.com/micropython-hardware-i2c-devices.md) - [MCP9808 Temperature Sensor Python Library](https://learn.adafruit.com/mcp9808-temperature-sensor-python-library.md) - [Adafruit FT232H With SPI & I2C Devices](https://learn.adafruit.com/adafruit-ft232h-with-spi-and-i2c-libraries.md) - [CircuitPython I2C and SPI Under the Hood](https://learn.adafruit.com/circuitpython-basics-i2c-and-spi.md) - [Adafruit QT Py ESP32-C3 WiFi Dev Board](https://learn.adafruit.com/adafruit-qt-py-esp32-c3-wifi-dev-board.md) - [Adafruit PiCowbell Adalogger for Pico](https://learn.adafruit.com/adafruit-picowbell-adalogger-for-pico.md) - [Speech Synthesis on the Raspberry Pi](https://learn.adafruit.com/speech-synthesis-on-the-raspberry-pi.md)