Overview

Analog Devices, known for their reliable and well-documented sensor chips - has a high precision and high resolution temperature sensor on the market, and we've got a breakout to make it easy to use! The Analog Devices ADT7410 gets straight to the point - it's an I2C temperature sensor, with 16-bit 0.0078°C temperature resolution and 0.5°C temperature tolerance. Wire it up to your microcontroller or single-board computer to get reliable temperature readings with ease

The ADT7410 has 2 address pins, so you can have up to 4 sensors on one I2C bus. There's also interrupt and critical-temperature alert pins. The sensor is good from 2.7V to 5.5V power and logic, for easy integration.

We've got both Arduino (C/C++) and CircuitPython (Python 3) libraries available so you can use it with any microcontroller like Arduino, ESP8266, Metro, etc or with Raspberry Pi or other Linux computers thanks to Blinka (our CircuitPython library support helper).

Each order comes with a fully tested and assembled breakout and some header for soldering to a PCB or breadboard. You'll be up and running in under 5 minutes!

Thanks to Digi-Key and Analog Devices for sponsoring the development of this breakout board - we've made the PCB "Digi-Key red" in their honor!

Technical Specs

  • Wide input-voltage range: 2.7 V to 5.5 V
  • Up to 16-bit temperature resolution (0.0078°C per lsb), default is 13 bits (0.0625°C per lsb).
  • Highly accurate temperature tolerances:
    • ±0.5°C from −40°C to +105°C (2.7 V to 3.6 V)
    • ±0.4°C from −40°C to +105°C (3.0 V)
  • Configurable I2C address allows up to four sensors on the I2C bus
  • Operates over I2C, so only two shared lines required

Pinouts

Power Pins

  • VIN: This is the voltage input to power for the sensor. You can connect either 5V or 3.3V to this, depending on the logic level of the MCU you are using. (Do not exceed 5V on this pin or you will permanently damage the sensor!)
  • GND: Connect the GND pin on the breakout to a GND pin on your MCU to have a common reference point.

Digital Logic Pins

  • SCL: This is the I2C clock line, which is pulled high to the same logic level as the VIN pin. Connect this to SCL on your development board.
  • SDA: This is the I2C data line, which is pulled high to the same logic level as the VIN pin. Connect this to SDA on your development board.
  • A0: This pin can be used to change the default I2C address for the sensor. See I2C Address Options further down for details.
  • A1: This pin can be used to change the default I2C address for the sensor. See I2C Address Options further down for details.
  • INT: This is the 'open-drain' interrupt output pin, and can be optionally connected to your MCU to trigger a HW interrupt whenever an appropriate event happens with the sensor. See the datasheet and driver for further details. It will go low or logic '0' when it is asserted.
  • CT: This 'open-drain' pin can be configured to trigger (it will go low or to logic '0' when a Critical Temperature (CT) threshold is passed. 

I2C Address Options

The I2C address on the ADT7410 will default to 0X48.

If this address is used by another sensor, or if you want to enable multiple ADT7410 temperature sensors on your device, you can change the I2C address for your specific breakout via the A0 and A1 pins, based on the following naming conventions:

A0 and A1 are pulled low by default, which is how we end up with the default address of 0x48.

The A6..A2 bits are hard-coded and should be ignored.

Assembly

Assembly

Start by preparing the header strip, cut to length if necessary. It will be easier to solder if you insert it into a breadboard - long pins down.

Add the ADT7410:

 

Place the board over the pins so that the short pins poke through the top of the breakout pads

And Solder!

 

Be sure to solder all pins for reliable electrical contact.

(For tips on soldering, be sure to check out the Guide to Excellent Soldering).

OK, you're done!

You can now plug in your ADT7410 breakout and enjoy using this high precision and high resolution temperature sensor.

Arduino

Arduino Wiring

You can easily wire this breakout to any Arduino-compatible microcontroller. 

Make the following connections between the Metro and the ADT7410

  • ADT7410 Vin to 3V or 5V (depending on the logic level of your board).
  • ADT7410 GND to Metro GND.
  • ADT7410 SCL to Metro SCL
  • ADT7410 SDA to Metro SDA

Install Adafruit_ADT7410 Library

To read data from your ADT7410, you will need to install the Adafruit_ADT7410 library. It is available from the Arduino library manager so we recommend using that.

From the Arduino IDE, open the Library Manager (Sketch -> Include Library -> Manage Libraries)

Type in Adafruit ADT7410 and click Install

You'll also need to install Adafruit Unified Sensor Library:

Load Example

Open up File -> Examples -> Adafruit ADT7410 Library -> adt7410test and upload to your Arduino wired up to the sensor

Upload the sketch to your board and open up the Serial Monitor (Tools->Serial Monitor). You should see the temperature in Celsius and Fahrenheit.

Download: file
Temp: 23.25*C	73.85*F
Temp: 23.19*C	73.74*F
Temp: 23.25*C	73.85*F
Temp: 23.25*C	73.85*F

Library Reference

Create the ADT7410 Sensor Object:

Download: file
Adafruit_ADT7410 tempsensor = Adafruit_ADT7410();

Initialize the sensor with:

Download: file
tempsensor.begin()

This function returns True if the ADT7410 was initialized correctly, and False if it was not.

Once initialized, you can query the temperature in °C with

Download: file
tempsensor.readTempC()

Which will return floating point (decimal + fractional) temperature. You can convert to Fahrenheit by multiplying by 1.8 and adding 32 as you have learned in grade school!

Python and CircuitPython

It's easy to use the ADT7410 sensor with Python or CircuitPython, and the Adafruit CircuitPython ADT7410 module. This module allows you to easily write Python code that reads temperature from the sensor.

You can use this sensor with any CircuitPython microcontroller board or with a computer that has GPIO and Python thanks to Adafruit_Blinka, our CircuitPython-for-Python compatibility library.

CircuitPython Microcontroller Wiring

First wire up a ADT7410 to your board exactly as shown on the previous page for Arduino. 

Make the following connections between the CircuitPython board and the ADT7410:

  • Board 3V to ADT7410 VIN
  • Board GND to ADT7410 GND
  • Board SCL to ADT7410 SCL
  • Board SDA to ADT7410 SDA

Python Computer Wiring

Since there's dozens of Linux computers/boards you can use we will show wiring for Raspberry Pi. For other platforms, please visit the guide for CircuitPython on Linux to see whether your platform is supported

Make the following connections between the Pi and the ADT7410:

  • Pi 3V to ADT7410 VIN
  • Pi GND to ADT7410 GND
  • Pi SCL to ADT7410 SCL
  • Pi SDA to ADT7410SDA

CircuitPython Installation of ADT7410 Library

You'll need to install the Adafruit CircuitPython ADT7410 library on your CircuitPython board.

First make sure you are running the latest version of Adafruit CircuitPython for your board.

Next you'll need to install the necessary libraries to use the hardware--carefully follow the steps to find and install these libraries from Adafruit's CircuitPython library bundle.  For example the Circuit Playground Express guide has a great page on how to install the library bundle for both express and non-express boards.

Remember for non-express boards like the Trinket M0, Gemma M0, and Feather/Metro M0 basic you'll need to manually install the necessary libraries from the bundle:

  • adafruit_adt7410.mpy
  • adafruit_bus_device
  • adafruit_register

You can also download theadafruit_adt7410.mpy from its releases page on Github.

Before continuing make sure your board's lib folder or root filesystem has the adafruit_adt7410.mpy, adafruit_register, and adafruit_bus_device files and folders copied over.

Next connect to the board's serial REPL so you are at the CircuitPython >>> prompt.

Python Installation of ADT7410 Library

You'll need to install the Adafruit_Blinka library that provides the CircuitPython support in Python. This may also require enabling I2C on your platform and verifying you are running Python 3. Since each platform is a little different, and Linux changes often, please visit the CircuitPython on Linux guide to get your computer ready!

Once that's done, from your command line run the following command:

  • sudo pip3 install adafruit-circuitpython-adt7410

If your default Python is version 3 you may need to run 'pip' instead. Just make sure you aren't trying to use CircuitPython on Python 2.x, it isn't supported!

Python Usage

To demonstrate the usage of the ADT7410, we'll use the Python REPL.

First, we'll import the following modules:

Download: file
import time
import board
import busio
import adafruit_adt7410

Next, we'll initialize the i2c bus and create the ADT object. We'll set it's high_resolution property to True, to use 16-bit resolution (instead of the default 13-bit).

Download: file
i2c_bus = busio.I2C(board.SCL, board.SDA)
adt = adafruit_adt7410.ADT7410(i2c_bus, address=0x48)
adt.high_resolution = True

You can read the temperature using the .temperature property (the output will be in degrees Celsius). Try putting your finger on the sensor or holding it against something cold to see the values change.

Download: file
adt.temperature

You can convert to Fahrenheit by multiplying by 1.8 and adding 32 as you have learned in grade school:

Download: file
tempC = adt.temperature
tempF = tempC * 1.8 + 32
tempF

That's all there is to reading the temperature with the ADT7410. Now you can use the ADT7410 temperature sensor to read the temperature in your project!

Full Example Code

import time
import board
import busio
import adafruit_adt7410

i2c_bus = busio.I2C(board.SCL, board.SDA)
adt = adafruit_adt7410.ADT7410(i2c_bus, address=0x48)
adt.high_resolution = True

while True:
    print(adt.temperature)
    time.sleep(0.5)

Downloads

This guide was first published on Feb 06, 2019. It was last updated on Feb 06, 2019.