Adafruit
Adafruit MCP9808 High Accuracy I2C Temperature Sensor Breakout
The Adafruit MCP9808 is a high-accuracy digital temperature sensor with ±0.25°C typical accuracy over its −40°C to +125°C range and 0.0625°C resolution. It c...
The Adafruit MCP9808 is a high-accuracy digital temperature sensor with ±0.25°C typical accuracy over its −40°C to +125°C range and 0.0625°C resolution. It communicates over standard I2C and runs on 2.7V to 5.5V power and logic, making it compatible with virtually any microcontroller or single-board computer.
With three address jumpers on the back of the breakout, you can connect up to 8 sensors on a single I2C bus without address collisions. The STEMMA QT / Qwiic connectors on both sides allow solderless daisy-chaining for quick prototyping.
Key Features
- High Accuracy – ±0.25°C typical (±0.5°C max from −20°C to +100°C)
- Fine Resolution – 0.0625°C measurement steps
- Wide Operating Range – −40°C to +125°C
- I2C Interface – Simple two-wire digital communication
- Up to 8 on One Bus – Three configurable address jumpers
- Wide Voltage Range – 2.7V to 5.5V power and logic
- Low Power – 200 µA typical operating current
- STEMMA QT / Qwiic Ports – Solderless I2C connections on both sides
Ideal For
- Precision environmental monitoring and data logging
- Multi-point temperature measurement arrays
- Calibration and reference temperature applications
- IoT and weather station projects
Package Contents
- 1× Adafruit MCP9808 Temperature Sensor breakout (with STEMMA QT / Qwiic connectors)
- 1× Header pin strip
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- Address jumpers
- Address jumpers are small solder pads or links used to change a device’s bus address. They matter when you want to connect multiple identical displays to the same controller without their addresses conflicting.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- single-board computer
- A complete computer built onto one circuit board, usually including the processor, memory, ports, and connectors. This matters because accessories like heatsinks must match the board’s layout and mounting holes to fit properly.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
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