Example Code for Arduino-Read Temperature and Humidity

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• SHTC3 Digital Temperature and Humudity Sensor x 1
• M-M/F-M/F-F Jumper wires

Software Preparation

• Arduino IDE
• Download and install the SHT Library. (About how to install the library?)

Wiring Diagram

Other Preparation Work

1. Install the Arduino IDE and the SHT Library as per the Software Preparation section.
2. Connect the hardware according to the Wiring Diagram.
3. Open the Arduino IDE and create a new sketch.
4. Include the DFRobot_SHT40 library in your sketch.
5. Ensure the sensor is connected correctly; the program will retrieve the sensor's device ID during setup—if retrieval fails, recheck the connection.

Sample Code

/*!
 * @file temperatureAndHumidity.ino
 * @brief Measurement of temperature and humidity
 * @n 本传感器可测量温湿度数据,温度的测量范围在-40~125 ℃ ,湿度的测量范围在 0~100 %RH。
 * @n 本传感器提供高、中、低,三种测量精度,还提供了高、中、低,三种加热功率对片上加热器进行加热。
 * @n 使用加热器的主要情景：
 * @n 1、Removal of condensed / spray water on the sensor surface. Although condensed water is not a reliability / quality problem to the sensor, it will however make the sensor nonresponsive to RH changes in the air as long as there is liquid water on the surface.
 * @n 2、Creep-free operation in high humid environments. Periodic heating pulses allow for creepSTXfree high-humidity measurements for extended times.
 * @n 实验现象 每次1秒钟测量一次温湿度数据并且通过串口打印，当湿度超过80%RH时，启动一次加热器。
 * @copyright  Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
 * @licence     The MIT License (MIT)
 * @author [yangfeng]<[email protected]>
 * @version  V1.0
 * @date  2021-03-19
 * @get from https://www.dfrobot.com
 * @url  https://github.com/DFRobot/DFRobot_SHT
 */
#include"DFRobot_SHT40.h"

/** 
 *  对于SHT40传感器这里支持两种型号,第一种是SHT40_AD1B, 第二种是SHT40_BD1B,这两种型号对应不同的IIC设备地址,这里对它们进行了封装,用户可传入如下两种参数
 *  型号为SHT40_AD1B的传感器使用:    SHT40_AD1B_IIC_ADDR
 *  型号为SHT40_AD1B的传感器使用:    SHT40_BD1B_IIC_ADDR
 */
DFRobot_SHT40 SHT40(SHT40_AD1B_IIC_ADDR); 


uint32_t id = 0;
float temperature, humidity;

void setup() {

  Serial.begin(9600);
  SHT40.begin();

  while((id = SHT40.getDeviceID()) == 0){
    Serial.println("ID retrieval error, please check whether the device is connected correctly!!!");
    delay(1000);
  }

  delay(1000);
  Serial.print("id :0x"); Serial.println(id, HEX);

}

void loop() {
  /**
   *    mode 用来配置传感器的工作模式
   *                  PRECISION_HIGH                       measure T & RH with high precision (high repeatability) 
   *                  PRECISION_MID                        measure T & RH with medium precision (medium repeatability)
   *                  PRECISION_LOW                        measure T & RH with lowest precision (low repeatability) 
   */
  temperature = SHT40.getTemperature(/*mode = */PRECISION_HIGH);
  /**
   *    mode 用来配置传感器的工作模式
   *                  PRECISION_HIGH                       measure T & RH with high precision (high repeatability) 
   *                  PRECISION_MID                        measure T & RH with medium precision (medium repeatability)
   *                  PRECISION_LOW                        measure T & RH with lowest precision (low repeatability) 
   */
  humidity = SHT40.getHumidity(/*mode = */PRECISION_HIGH);

  if(temperature == MODE_ERR){
    Serial.println("Incorrect mode configuration to get temperature");
  } else{
    Serial.print("Temperature :"); Serial.print(temperature); Serial.println(" C");
  }
  if(humidity == MODE_ERR){
    Serial.println("The mode for getting humidity was misconfigured");
  } else{
    Serial.print("Humidity :"); Serial.print(humidity); Serial.println(" %RH");
  }

  /**
   *    mode 用来配置传感器的工作模式
   *                  PRECISION_HIGH                       measure T & RH with high precision (high repeatability) 
   *                  PRECISION_MID                        measure T & RH with medium precision (medium repeatability)
   *                  PRECISION_LOW                        measure T & RH with lowest precision (low repeatability) 
   */
  //if(SHT40.getTemHum(temperature,humidity,PRECISION_HIGH)){
  //  Serial.print("Temperature :"); Serial.print(temperature); Serial.println(" C");
  //  Serial.print("Humidity :"); Serial.print(humidity); Serial.println(" %RH");
  //} else{
  //  Serial.println("Pattern configuration error");
  //}
  if(humidity > 80){
  /**
   *    mode 用来配置传感器的工作模式
   *                  POWER_CONSUMPTION_H_HEATER_1S                        activate highest heater power & high precis. meas. for 1s 
   *                  POWER_CONSUMPTION_H_HEATER_100MS                     activate highest heater power & high precis. meas. for 0.1s
   *                  POWER_CONSUMPTION_M_HEATER_1S                         activate medium heater power  & high precis. meas. for 1s 
   *                  POWER_CONSUMPTION_M_HEATER_100MS                      activate medium heater power  & high precis. meas. for 0.1s 
   *                  POWER_CONSUMPTION_L_HEATER_1S                         activate lowest heater power  & high precis. meas. for 1s 
   *                  POWER_CONSUMPTION_L_HEATER_100MS                      activate lowest heater power  & high precis. meas. for 0.1s 
   */
    SHT40.enHeater(/*mode = */POWER_CONSUMPTION_H_HEATER_1S);
  }
  delay(1000);

  Serial.println("----------------------------------------");
}

Result

Open the serial port to display the current temperature and humidity data.

Additional Information

• The sensor supports two I2C addresses: SHT40_AD1B_IIC_ADDR (for SHT40-AD1B) and SHT40_BD1B_IIC_ADDR (for SHT40-BD1B). Ensure you use the correct address for your sensor model.
• The heater function is used to remove condensed water from the sensor surface or enable creep-free operation in high-humidity environments. Refer to the sensor datasheet for more details on heater usage.