SHT31 Temperature Humidity Sensor Features
The SHT31 sensor module is a temperature and humidity sensor with high accuracy and quick response time.
Specifications:
- Temperature measurement range: -40 to +90 degrees Celsius
- Temperature measurement accuracy: 3 degrees Celsius
- Humidity measurement range: 0 – 100% RH
- Humidity measurement accuracy: 2% RH
- Communication protocol: I2C
- Data transition: up to 1MHz frequency
- Address pin included: To adjust I2C protocol address
SHT31 Temperature Humidity Sensor Pinout
This Module has 6 pins:
- GND: Ground
- VCC: Module power supply – 5V
- SCL: Serial Clock Input for I2C Protocol
- SDA: Serial Data Input/Output for I2C Protocol
- RST: Reset pin
- ADD: Address adjusting pin for I2C Protocol (If it is LOW, the address will be 0x44 and If it is, HIGH the address will be 0x45)
You can see the pinout of this module in the image below.
Required Materials
Hardware Components
Software Apps
Interfacing SHT31 Temperature Humidity Sensor with Arduino
Step 1: Circuit
The following circuit show how you should connect Arduino to SHT31 sensor. Connect wires accordingly.
Step 2: Library
Go to Library manager and install the Adafruit SHT31 Library
Note
If you need more help with installing a library on Arduino, read this tutorial: How to Install an Arduino Library
Step 3: Code
Upload the following code to Arduino. Then open the Serial Monitor.
/*
modified on Dec 30, 2020
Modified by MehranMaleki from Arduino Examples
Home
*/
#include <Arduino.h>
#include <Wire.h>
#include "Adafruit_SHT31.h"
Adafruit_SHT31 sht31 = Adafruit_SHT31();
void setup() {
Serial.begin(9600);
while (!Serial)
delay(10); // will pause Zero, Leonardo, etc until serial console opens
Serial.println("SHT31 test");
//Set to 0x45 for alternate i2c addr
if (! sht31.begin(0x44)) {
Serial.println("Couldn't find SHT31");
while (1) delay(1);
}
}
void loop() {
float t = sht31.readTemperature();
float h = sht31.readHumidity();
// check if 'is not a number'
if (! isnan(t)) {
Serial.print("Temperature = ");
Serial.print(t);
Serial.print("*C");
Serial.print("\t\t");
}
else {
Serial.println("Failed to read temperature");
}
// check if 'is not a number'
if (! isnan(h)) {
Serial.print("Humidity = %");
Serial.println(h);
}
else {
Serial.println("Failed to read humidity");
}
delay(1000);
}
In this code, the humidity and temperature data will be received from the sensor every second and displayed on the Serial Monitor.
The output is as follows:
