SHT40 Sensor and Arduino Uno

Parts Required

You can connect to the sensor using dupont style jumper wire.

This should work with other Arduino boards – I have tried a Mega and Nano for example

Name		Link
Arduino Uno		Aliexpress link Amazon Ebay
SHT40		Aliexpress link Amazon Ebay
Connecting cables		Aliexpress link Amazon Ebay

Schematic/Connection

I used 3.3v from the Arduino Uno – 5v should be ok if the module has an onboard regulator. You will need to check.

Code Example

This example uses a couple of libraries, both of which can be installed using the library manager

You need the Adafruit library for the SHT40 – https://github.com/adafruit/Adafruit_SHT4X

You also need an I2C support library from the same folks for the library above to work and that is available from – https://github.com/adafruit/Adafruit_BusIO

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);

  // You can have 6 different heater settings
  sht4.setHeater(SHT4X_NO_HEATER);
  
}


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);
}

Serial Monitor Output

Adafruit SHT4x test
Found SHT4x sensor
Serial number 0x1044FA2B
Temperature: 18.84 degrees C
Humidity: 39.21% rH
Read duration (ms): 11

Links

https://www.sensirion.com/en/download-center/humidity-sensors/humidity-sensor-sht4x/