Table of Contents

MCP9808 - Digital Temperature Sensor

Microchip Technology Inc.’s MCP9808 digital temperature sensor converts temperatures between -20°C and +100°C to a digital word with ±0.25°C/±0.5°C (typical/maximum) accuracy


  • You can find the datasheet here


Important: make sure you properly setup the I2C pins especially for ESP32 before creating the I2cDevice, make sure you install the nanoFramework.Hardware.ESP32 nuget:

// when connecting to an ESP32 device, need to configure the I2C GPIOs
// used for the bus
Configuration.SetPinFunction(21, DeviceFunction.I2C1_DATA);
Configuration.SetPinFunction(22, DeviceFunction.I2C1_CLOCK);

For other devices like STM32, please make sure you're using the preset pins for the I2C bus you want to use.

Hardware Required

  • MCP9808
  • Male/Female Jumper Wires


  • SCL - SCL
  • SDA - SDA
  • VCC - 5V
  • GND - GND


I2cConnectionSettings settings = new I2cConnectionSettings(1, Mcp9808.DefaultI2cAddress);
I2cDevice device = I2cDevice.Create(settings);

using(Mcp9808 sensor = new Mcp9808(device))
    while (true)
        Debug.WriteLine($"Temperature: {sensor.Temperature.Celsius} ℃");