Introduction

This I2C digital temperature & humidity sensor offers high accuracy of ±3.0RH% for humidity and ±0.5℃ for temperature, and features user-programmable humidity & temperature alarm function.
Its housing is made of 304 stainless steel to ensure good impact resistance, heat resistance, low temperature and chemical resistance. The sensor output is designed as DuPont 2.54 connector for easy wiring. Also, there are two built-in 4.7K pull-up resistors and one 100nF filtering capacitor so the sensor can be directly used with microcontrollers like Arduino.
This temperature & humidity sensor can be applied to electronic, medical, automotive, industrial, weather, and other fields, including home appliances like HVAC, dehumidifiers and refrigerators, testing & inspection equipment, and other relevant temperature & humidity measurements and controls.

Features

304 stainless steel, good impact resistance
Low power consumption, high accuracy
User-programmable temperature & humidity alarm response address (ARA)

Specification

Operating Voltage: 2.5V~5.5V
Standby Current: 0.05uA (Typical), 0.3uA (Max)
Average Operating Current: 1.5uA (Typical), 3.0uA (Max)
Temperature Measurement Range (℃): -40℃~125℃
Temperature Measurement Accuracy (℃): ±0.5℃@0℃~50℃
Humidity Measurement Range (%RH): 0%RH~100%RH
Humidity Measurement Accuracy (%RH): ±3.0%RH@20%RH~80％RH
Communication：I2C
Connector: DuPont 2.54
Reserved DuPont Wire Length: 5cm
Wire Length: 1.5m
Housing: 304 stainless steel
Wire Sequence: red VCC; black GND; white SCL; yellow SDA

Pinout

Color	Label	Description
Red	VCC	+
Black	GND	-
White	SDL	Data
Yellow	SDA	Clock

Tutorial

Requirements

Hardware
- DFRduino UNO R3 (or similar) x 1
- I2C Temperature & Humidity Sensor (Stainless Steel Shell) x 1

Software
- Arduino IDE

Connection Diagram

Sample Code

Download and install the Arduino Library (About how to install the library?)

Read Temperature & Humidity Values

#include "Wire.h"
#define address 0x40
char dtaUart[15];
char dtaLen = 0;
uint8_t Data[100] = {0};
uint8_t buff[100] = {0};
void setup()
{
  Serial.begin(9600);
  Wire.begin();
}
uint8_t buf[4] = {0};
uint16_t data, data1;
float temp;
float hum;
void loop()
{
  readReg(0x00, buf, 4);
  data = buf[0] << 8 | buf[1];
  data1 = buf[2] << 8 | buf[3];
  temp = ((float)data * 165 / 65535.0) - 40.0;
  hum =  ((float)data1 / 65535.0) * 100;
  Serial.print("temp(C):");
  Serial.print(temp);
  Serial.print("\t");
  Serial.print("hum(%RH):");
  Serial.println(hum);
  delay(500);
}
uint8_t readReg(uint8_t reg, const void* pBuf, size_t size)
{
  if (pBuf == NULL) {
    Serial.println("pBuf ERROR!! : null pointer");
  }
  uint8_t * _pBuf = (uint8_t *)pBuf;
  Wire.beginTransmission(address);
  Wire.write(&reg, 1);
  if ( Wire.endTransmission() != 0) {
    return 0;
  }
  delay(20);
  Wire.requestFrom(address, (uint8_t) size);
  for (uint16_t i = 0; i < size; i++) {
    _pBuf[i] = Wire.read();
  }
  return size;
}

Result

FAQ

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I2C Temperature & Humidity Sensor (Stainless Steel Shell) Wiki - DFRobot