SHT20 I2C Temperature & Humidity Sensor (Waterproof Probe) SKU: SEN0227

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Introduction

This is a SHT20 I2C temperature & humidity sensor with waterproof probe. It comes with the 4C CMOSens® SHT20 temperature & humidity sensor chip, and the probe has gone through dual waterproof protection.
The SHT20 I2C temperature & humidity sensor adopt Sensirion new technique. Besides the capacitive type humidity sensor and the band gap temperature sensor, the chip contains an amplifier, A/D converter, OTP memory and a digital processing unit. To compare with early SHT1x series and SHT7x series, SHT20 shows better reliability and long-term stability. It can measure surrounding environment temperature and relative air humidity precisely.
The Arduino SHT20 waterproof temperature & humidity sensor adopts dual waterproof protection. The inner PCB has perfusion and encapsulation protection, and the probe enclosure is made of PE waterproof materials. This is a special waterproof breathable material that allows water molecules to seep in, blocking water droplets from seeping in. The sensor won't be damaged even if it is submerged in water for a long time. There is a built-in 10k Pull-up resistor and 0.1uf filter capacitor, so It can be used directly with the microcontroller such as Arduino. Recommend DFRobot Gravity 4Pin Sensor Adapter, it is quite convenient.’

Specification

  • Operating Voltage: 3.3V/5V
  • Communication Interface: I2C / IIC
  • Protection Class: waterproof anti-condensation
  • RH Response Time: 8s (tau63%)
  • Accuracy: ±3% RH / ±0.3 ℃
  • Measuring Range: 0-100% RH / -40-125 ℃
  • Dimension: 73mm * 17mm / 2.87 * 0.67 inches
  • Weight: 44g


Board Overview

SHT20 I2C Temperature & Humidity Sensor (Waterproof Probe)
Num Label Description
1 Red VCC
2 Green GND
3 Black (Blue) SDA
4 White (Yellow) SCL


Tutorial

In this section, we'll use Arduino to drive SHT20 I2C Temperature & Humidity Sensor (Waterproof Probe)

Requirements

  • Hardware
    • DFRduino UNO (or similar) x 1
    • SHT20 I2C Temperature & Humidity Sensor
    • M-M/F-M/F-F Jumper wires


Connection Diagram

Arduino SHT20 Temperature & Humidity Sensor Connection


Sample Code

Download the DFRobot Arduino SHT20 library
How to install Libraries in Arduino IDE


/*!
 * @file  DFRobot_SHT20_test.ino
 * @brief DFRobot's SHT20 Humidity And Temperature Sensor Module
 * @n     This example demonstrates how to read the user registers to display resolution and other settings.
 *        Uses the SHT20 library to display the current humidity and temperature.
 *        Open serial monitor at 9600 baud to see readings.
 *        Errors 998 if not sensor is detected. Error 999 if CRC is bad.
 * Hardware Connections:
 * -VCC = 3.3V
 * -GND = GND
 * -SDA = A4 (use inline 330 ohm resistor if your board is 5V)
 * -SCL = A5 (use inline 330 ohm resistor if your board is 5V)
 */

#include <Wire.h>
#include "DFRobot_SHT20.h"

DFRobot_SHT20    sht20;

void setup()
{
    Serial.begin(9600);
    Serial.println("SHT20 Example!");
    sht20.initSHT20();                                  // Init SHT20 Sensor
    delay(100);
    sht20.checkSHT20();                                 // Check SHT20 Sensor
}

void loop()
{
    float humd = sht20.readHumidity();                  // Read Humidity
    float temp = sht20.readTemperature();               // Read Temperature
    Serial.print("Time:");
    Serial.print(millis());
    Serial.print(" Temperature:");
    Serial.print(temp, 1);
    Serial.print("C");
    Serial.print(" Humidity:");
    Serial.print(humd, 1);
    Serial.print("%");
    Serial.println();
    delay(1000);
}


Expected Results

Arduino SHT20 Serial port Result


FAQ

Q1. How to measure the soil moisture?.

A. Soil moisture is defined as: Get 1 kg soil samples, thoroughly dry it, the ratio between reduced weight (water weight) and 1 kg weight is soil moisture. It totally different to the air humidity.


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DFshopping car1.png Get SHT20 I2C Temperature & Humidity Sensor from DFRobot Store or DFRobot Distributor.