Introduction¶

The MCP9808 is an awesome, high accuracy temperature sensor that communicates over I2C. Its available on Adafruit as a breakout.

Dependencies¶

This driver depends on:

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Installing from PyPI¶

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-mcp9808

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-circuitpython-mcp9808

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .env
source .env/bin/activate
pip3 install adafruit-circuitpython-mcp9808

Usage Notes¶

Getting the temperature in Celsius is easy! First, import all of the pins from the board, busio for native I2C communication and the thermometer library itself.

from board import *
import busio
import adafruit_mcp9808

Next, initialize the I2C bus in a with statement so it always gets shut down ok. Then, construct the thermometer class:

# Do one reading
with busio.I2C(SCL, SDA) as i2c:
    t = adafruit_mcp9808.MCP9808(i2c)

    # Finally, read the temperature property and print it out
    print(t.temperature)

Contributing¶

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Documentation¶

For information on building library documentation, please check out this guide.

Table of Contents¶

Simple test¶

Ensure your device works with this simple test.

examples/mcp9808_simpletest.py¶

import time
import board
import busio
import adafruit_mcp9808

i2c_bus = busio.I2C(board.SCL, board.SDA)

# To initialise using the default address:
mcp = adafruit_mcp9808.MCP9808(i2c_bus)

# To initialise using a specified address:
# Necessary when, for example, connecting A0 to VDD to make address=0x19
# mcp = adafruit_mcp9808.MCP9808(i2c_bus, address=0x19)


while True:
    tempC = mcp.temperature
    tempF = tempC * 9 / 5 + 32
    print("Temperature: {} C {} F ".format(tempC, tempF))
    time.sleep(2)

`adafruit_mcp9808` - MCP9808 I2C Temperature Sensor¶

CircuitPython library to support MCP9808 high accuracy temperature sensor.

Author(s): Scott Shawcroft

Implementation Notes¶

Hardware:

Adafruit MCP9808 High Accuracy I2C Temperature Sensor Breakout (Product ID: 1782)

Software and Dependencies:

Adafruit CircuitPython firmware (0.8.0+) for the ESP8622 and M0-based boards: https://github.com/adafruit/circuitpython/releases
Adafruit’s Bus Device library: https://github.com/adafruit/Adafruit_CircuitPython_BusDevice

Notes:

Datasheet: http://www.adafruit.com/datasheets/MCP9808.pdf

class adafruit_mcp9808.MCP9808(i2c_bus, address=24)[source]¶

Interface to the MCP9808 temperature sensor.

temperature¶: Temperature in celsius. Read-only.