SHT30 Archives

In this article we look at the SHT30 humidity sensor

There is an Arduino based library as well so we will use the Arduino IDE and connect this up to an ESP32 board. This is the particular sensor I used

First of all the sensor

The digital SHT3x humidity sensor series takes sensor technology to a new level. As the successor of the SHT2x series it sets the industry standard in humidity sensing. The SHT3x humidity sensor series consists of a low-cost version with the SHT30 humidity sensor, a standard version with the SHT31 humidity sensor, and a high-end version with the SHT35 humidity sensor. Automotive grade versions are also available.

The SHT3x humidity sensor series combines multiple functions and various interfaces (I²C, analog voltage output) with a applications-friendly, very wide operating voltage range (2.15 to 5.5 V). The SHT3x humidity sensor is available in both large and small volumes.

The SHT3x builds on a completely new and optimized CMOSens® chip, which allows for increased reliability and improved accuracy specifications. The SHT3x offers a range of new features, such as enhanced signal processing, two distinctive and user-selectable I²C addresses, an alert mode with programmable humidity and temperature limits, and communication speeds of up to 1 MHz.

The DFN package has a footprint of 2.5 × 2.5 mm² with a height of 0.9 mm. This allows for integration of the SHT3x into a great variety of applications. Additionally, the wide supply voltage range of 2.15 to 5.5 V and variety of available interfaces guarantee compatibility with diverse integration requirements.

Features

Size	2.5 x 2.5 x 0.9 mm
Output	I²C, Voltage Out
Supply voltage range	2.15 to 5.5 V
Energy consumption	4.8µW (at 2.4 V, low repeatability, 1 measurement / s)
RH operating range	0 – 100% RH
T operating range	-40 to +125°C (-40 to +257°F)
RH response time	8 sec (tau63%)

Parts Required

This particular sensor costs about $2.40

Name	Link
ESP32		Aliexpress link Amazon Ebay
SHT30		Aliexpress link Ebay link Amazon Link
Connecting cables		Aliexpress link Amazon Ebay

Schematic/Connection

esp32 and SHT30 layout

Code Example

You need the library from – https://github.com/Risele/SHT3x

There are many examples to choose from

#include <SHT3x.h>
SHT3x Sensor;
void setup() 
{
  
  Serial.begin(19200);
  Sensor.Begin();
}

void loop() 
{

  Sensor.UpdateData();
  Serial.print("Temperature: ");
  Serial.print(Sensor.GetTemperature());
  Serial.write("\xC2\xB0"); //The Degree symbol
  Serial.println("C");
  Serial.print("Humidity: ");
  Serial.print(Sensor.GetRelHumidity());
  Serial.println("%");

  delay(500);
}

Output

Open the serial monitor and you should see something like this

Temperature: 27.65°C
Humidity: 58.01%
Temperature: 28.30°C
Humidity: 59.60%
Temperature: 28.86°C
Humidity: 60.85%
Temperature: 29.38°C
Humidity: 61.74%
Temperature: 29.36°C
Humidity: 62.14%

Links

Documents

In this example we will connect an SHT30 shield to our MH ET LIVE ESP32 MINI KIT, here is the shield

SHT30 Shield For WeMos D1 mini SHT30 I2C Digital Temperature and Humidity Sensor Module
SHT3x-DIS is the next generation of Sensirion’s temperature and humidity sensors. It builds on a new CMOSens® sensor chip that is at the heart of Sensirion’s new humidity and temperature platform. The SHT3x-DIS has increased intelligence, reliability and improved accuracy specifications compared to its predecessor. Its functionality includes enhanced signal processing, two distinctive and user selectable I2C addresses and communication speeds of up to 1 MHz.

The DFN package has a footprint of 2.5 x 2.5 mm while keeping a height of 0.9 mm. This allows for integration of the SHT3x-DIS into a great variety of applications.
Additionally, the wide supply voltage range of 2.4 to 5.5 V guarantees compatibility with diverse assembly situations. All in all, the SHT3x-DIS incorporates 15 years of knowledge of Sensirion, the leader in the humidity sensor industry.

Code

This example uses the adafruit sht31 library – https://github.com/adafruit/Adafruit_SHT31

[cpp]

#include <Arduino.h>
#include <Wire.h>
#include “Adafruit_SHT31.h”

Adafruit_SHT31 sht31 = Adafruit_SHT31();

void setup()
{
Serial.begin(9600);
Serial.println(“SHT31 test”);
if (! sht31.begin(0x45))
{
Serial.println(“Couldn’t find SHT31”);
while (1) delay(1);
}
}

void loop()
{
float t = sht31.readTemperature();
float h = sht31.readHumidity();

if (! isnan(t))
{ // check if ‘is not a number’
Serial.print(“Temp *C = “); Serial.println(t);
}
else
{
Serial.println(“Failed to read temperature”);
}

if (! isnan(h))
{ // check if ‘is not a number’
Serial.print(“Hum. % = “); Serial.println(h);
}
else
{
Serial.println(“Failed to read humidity”);
}
Serial.println();
delay(1000);
}

[/cpp]

Output

Open the serial monitor

Temp *C = 27.09
Hum. % = 38.13

Temp *C = 29.39
Hum. % = 42.54

Temp *C = 30.67
Hum. % = 52.62

Temp *C = 31.08
Hum. % = 58.37

Temp *C = 31.05
Hum. % = 60.80

Temp *C = 29.83
Hum. % = 50.91

Temp *C = 29.50
Hum. % = 44.09

Link

SHT30 Shield For WeMos D1 mini SHT30 I2C Digital Temperature and Humidity Sensor Module

SHT30