Adafruit SHT40 User Manual

Adafruit Sensirion SHT40 Temperature & Humidity Sensor

Created by Kattni Rembor

Last updated on 2021-06-01 04:56:08 PM EDT

2 3 6

6 6

7

7 8

9 12 13

13 13 14 15 15 16

17 18

18

18 18

Guide Contents

Guide Contents Overview Pinouts

Power Pins I2C Logic Pins

Arduino

Wiring

Installation Load Example Example Code Arduino Docs Python & CircuitPython

CircuitPython Microcontroller Wiring Python Computer Wiring CircuitPython Installation of SHT4x Library Python Installation of SHT4x Library CircuitPython & Python Usage Full Example Code

Python Docs Downloads

Files:

Schematic Fab Print

Overview

Sensirion Temperature/Humidity sensors are some of the finest & highest-accuracy devices you can get.

And finally, we have some that have a true I2C interface for easy reading. The SHT40 sensor is the fourth

generation (started at the SHT10 and worked its way up to the top!). The SHT40 has an excellent ±1.8%

typical relative humidity accuracy from 25 to 75% and ±0.2 °C typical accuracy from 0 to 75 °C.

Unlike some earlier SHT sensors, this sensor has a

true

I2C interface for easy interfacing with only two

wires (plus power and ground!). Thanks to the voltage regulator and level shifting circuitry we've included

on the breakout It is also is 3V or 5V compliant, so you can power and communicate with it using any

microcontroller or microcomputer.

Such a lovely chip - so we spun up a breakout board with the SHT4x and some supporting circuitry such

as pullup resistors and capacitors. To make things even easier, we've included SparkFun

Qwiic (https://adafru.it/Fpw) compatible STEMMA QT (https://adafru.it/Ft4) connectors for the I2C bus so

you don't even need to solder! QT Cable is not included, but we have a variety in the

shop (https://adafru.it/JnB).

If you prefer working on a breadboard, each order comes with one fully assembled and tested PCB

breakout and a small piece of header. You'll need to solder the header onto the PCB, but it's fairly easy

and takes only a few minutes even for a beginner.

We've written both Arduino and CircuitPython/Python library code for this chip, so you can use it with just

about any microcontroller or single-board computer like Raspberry Pi.

Pinouts

Power Pins

VIN - This is the power pin. To power the board, give it the same power as the logic level of your

microcontroller - e.g. for a 5V microcontroller like Arduino, use 5V

3V - This is the 3.3V output from the voltage regulator, you can grab up to 100mA from this if you

like.

GND - common ground for power and logic

I2C Logic Pins

SCL - I2C clock pin, connect to your microcontroller I2C clock line. This pin is level shifted so you can

use 3-5V logic, and there's a 10K pullup on this pin.

SDA - I2C data pin, connect to your microcontroller I2C data line. This pin is level shifted so you can

use 3-5V logic, and there's a 10K pullup on this pin.

STEMMA QT (https://adafru.it/Ft4) - These connectors allow you to connectors to dev boards

with STEMMA QT connectors or to other things with various associated

accessories (https://adafru.it/Ft6)

The I2C address is 0x44 and cannot be changed

Arduino

Wiring

Connecting the SHT40 to your Feather or Arduino is easy:

If you are running a Feather (3.3V), connect Feather

3V to board VIN

If you are running a 5V Arduino (Uno, etc.), connect

Arduino 5V to board VIN

Connect Feather or Arduino GND to board GND

Connect Feather or Arduino SCL to board SCL

Connect Feather or Arduino SDA to board SDA

The final results should resemble the illustration above, showing an Adafruit Metro development board.

Installation

You can install the Adafruit SHT4X Library for Arduino using the Library Manager in the Arduino IDE:

Click the Manage Libraries ... menu item, search for Adafruit SHT4X, and select the Adafruit SHT4X

library:

Then follow the same process for the Adafruit BusIO library.

Load Example

Open up File -> Examples -> Adafruit SHT4X -> SHT4test 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 the values for temperature and humidity.

Example Code

The following example code is part of the standard library, but illustrates how you can retrieve sensor data

from the SHT40 for the temperature and humidity values:

/*************************************************** This is an example for the SHT4x Humidity & Temp Sensor

Designed specifically to work with the SHT4x sensor from Adafruit

----> https://www.adafruit.com/products/4885

These sensors use I2C to communicate, 2 pins are required to interface ****************************************************/

#include "Adafruit_SHT4x.h"

Adafruit_SHT4x sht4 = Adafruit_SHT4x();

void setup() { Serial.begin(115200);

while (!Serial) delay(10); // will pause Zero, Leonardo, etc until serial console opens

Serial.println("Adafruit SHT4x test"); if (! sht4.begin()) { Serial.println("Couldn't find SHT4x"); while (1) delay(1); } Serial.println("Found SHT4x sensor"); Serial.print("Serial number 0x"); Serial.println(sht4.readSerial(), HEX);

// You can have 3 different precisions, higher precision takes longer sht4.setPrecision(SHT4X_HIGH_PRECISION); switch (sht4.getPrecision()) { case SHT4X_HIGH_PRECISION:

Serial.println("High precision"); break; case SHT4X_MED_PRECISION: Serial.println("Med precision"); break; case SHT4X_LOW_PRECISION: Serial.println("Low precision"); break; }

// You can have 6 different heater settings // higher heat and longer times uses more power // and reads will take longer too! sht4.setHeater(SHT4X_NO_HEATER); switch (sht4.getHeater()) { case SHT4X_NO_HEATER: Serial.println("No heater"); break; case SHT4X_HIGH_HEATER_1S: Serial.println("High heat for 1 second"); break; case SHT4X_HIGH_HEATER_100MS: Serial.println("High heat for 0.1 second"); break; case SHT4X_MED_HEATER_1S: Serial.println("Medium heat for 1 second"); break; case SHT4X_MED_HEATER_100MS: Serial.println("Medium heat for 0.1 second"); break; case SHT4X_LOW_HEATER_1S: Serial.println("Low heat for 1 second"); break; case SHT4X_LOW_HEATER_100MS: Serial.println("Low heat for 0.1 second"); break; }

}

void loop() { sensors_event_t humidity, temp;

uint32_t timestamp = millis(); sht4.getEvent(&humidity, &temp);// populate temp and humidity objects with fresh data timestamp = millis() - timestamp;

Serial.print("Temperature: "); Serial.print(temp.temperature); Serial.println(" degrees C"); Serial.print("Humidity: "); Serial.print(humidity.relative_humidity); Serial.println("% rH");

Serial.print("Read duration (ms): "); Serial.println(timestamp);

delay(1000); }

Arduino Docs

Arduino Docs (https://adafru.it/Qib)

Python & CircuitPython

It's easy to use the Adafruit Sensirion SHT40 Temperature & Humidity Sensor with CircuitPython and the

Adafruit CircuitPython SHT4x (https://adafru.it/Qid) module. This module allows you to easily write Python

code that reads temperature and humidity data 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 (https://adafru.it/BSN).

CircuitPython Microcontroller Wiring

First wire up an SHT40 to your board exactly as follows. Here is an example of the SHT40 wired to a

Feather using I2C:

Board 3V to sensor VIN

Board GND to sensor GND

Board SCL to sensor SCL

Board SDA to sensor 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 (https://adafru.it/BSN).

Here's the Raspberry Pi wired with I2C:

Pi 3V3 to sensor VIN

Pi GND to sensor GND

Pi SCL to sensor SCL

Pi SDA to sensor SDA

CircuitPython Installation of SHT4x Library

You'll need to install the Adafruit CircuitPython SHT4x (https://adafru.it/Qid) library on your CircuitPython

board.

First make sure you are running the latest version of Adafruit CircuitPython (https://adafru.it/Amd) 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 (https://adafru.it/ENC). Our

CircuitPython starter guide has a great page on how to install libraries from the library

bundle (https://adafru.it/ABU).

Copy the following file from the bundle to the lib folder on your CIRCUITPY drive:

adafruit_sht4x.mpy

Before continuing make sure your board's lib folder or root filesystem has the adafruit_sht4x.mpy file

copied over.

Next connect to the board's serial REPL (https://adafru.it/Awz)so you are at the CircuitPython >>> prompt.

Python Installation of SHT4x 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 (https://adafru.it/BSN)!

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

pip3 install adafruit-circuitpython-sht4x

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!

CircuitPython & Python Usage

To demonstrate the usage of the sensor we'll initialize it and read from the sensor in the board's Python

REPL.

Run the following code to import the necessary modules and initialize the I2C connection with the sensor:

import board import adafruit_sht4x

sht = adafruit_sht4x.SHT4x(board.I2C())

Now you're ready to read values from the sensor using these properties:

relative_humidity - The current relative humidity in % rH

temperature - The current temperature in degrees celsius

print(sht.temperature) print(sht.relative_humidity)

That's all there is to reading temperature and humidity from the SHT40 sensor!

Full Example Code

import time import board import adafruit_sht4x

i2c = board.I2C() # uses board.SCL and board.SDA sht = adafruit_sht4x.SHT4x(i2c) print("Found SHT4x with serial number", hex(sht.serial_number))

sht.mode = adafruit_sht4x.Mode.NOHEAT_HIGHPRECISION # Can also set the mode to enable heater # sht.mode = adafruit_sht4x.Mode.LOWHEAT_100MS print("Current mode is: ", adafruit_sht4x.Mode.string[sht.mode])

while True: temperature, relative_humidity = sht.measurements print("Temperature: %0.1f C" % temperature) print("Humidity: %0.1f %%" % relative_humidity) print("") time.sleep(1)

Python Docs

Python Docs (https://adafru.it/Qic)

Downloads

Files:

SHT40 Datasheet (https://adafru.it/QhD)

Fritzing object in the Adafruit Fritzing Library (https://adafru.it/QhE)

EagleCAD PCB files on GitHub (https://adafru.it/QhF)

Schematic

Fab Print