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

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

• Software
  • Arduino IDE, [https://www.arduino.cc/en/software| Click to Download Arduino IDE from Arduino®]

Connection Diagram

Sample Code

Download the DFRobot Arduino SHT20 library

How to install Libraries in Arduino IDE

/*!
 * @file  getHumidityAndTemperature.ino
 * @brief  DFRobot's SHT20 Humidity And Temperature Sensor Module
 * @details  This example demonstrates how to read the user registers to display resolution and other settings.
 * @n  Uses the SHT20 library to display the current humidity and temperature.
 * @n  Open serial monitor at 9600 baud to see readings.
 * @n  Errors 998 if not sensor is detected. Error 999 if CRC is bad.
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @license  The MIT License (MIT)
 * @author  [Zhangjiawei](jiawei.zhang@dfrobot.com)
 * @maintainer  [qsjhyy](yihuan.huang@dfrobot.com)
 * @version  V1.0
 * @date  2021-12-03
 * @url  https://github.com/DFRobot/DFRobot_SHT20
 */
#include "DFRobot_SHT20.h"

/**
 * 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)
 */
DFRobot_SHT20 sht20(&Wire, SHT20_I2C_ADDR);

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

  // Init SHT20 Sensor
  sht20.initSHT20();
  delay(100);
  Serial.println("Sensor init finish!");

  /**
   * Check the current status information of SHT20
   * Status information: End of battery, Heater enabled, Disable OTP reload
   * Check result: yes, no
   */
  sht20.checkSHT20();
}

void loop()
{
  /**
   * Read the measured data of air humidity
   * Return the measured air humidity data of float type, unit: %
   */
  float humd = sht20.readHumidity();

  /**
   * Read the measured temp data
   * Return the measured temp data of float type, unit: C
   */
  float temp = sht20.readTemperature();

  Serial.print("Time:");
  Serial.print(millis());   // Get the system time from Arduino
  Serial.print(" Temperature:");
  Serial.print(temp, 1);   // Only print one decimal place
  Serial.print("C");
  Serial.print(" Humidity:");
  Serial.print(humd, 1);   // Only print one decimal place
  Serial.print("%");
  Serial.println();

  delay(1000);
}

Expected Results

FAQ

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