HTU21 Digital Humidity And Temperature Sensor Module GY-21

Technical Specifications:

Supply Voltage: 2.1V - 3.6V
Low Power Consumption - 0.15uA
I2C Interface
Resolution: 0.04%RH, 0.02°C
Accuracy: ±2%RH, ±3°C
Weight: 1.02g
Dimensions: 21mm x 16mm

Note: The HTU21 chip datasheet is available in PDF format in the DOWNLOADS section.

Connection Example:

To complete this example, you will need the following components:

UNO R3 Development Board compatible with Arduino
HTU21 Precision Temperature and Humidity Sensor, GY-21
Various wires and connectors for establishing connections

Connection Example:

Code Example:

#include <SHT21.h> // include SHT21 library

SHT21 sht;

float temp; // variable to store temperature
float humidity; // variable to store humidity

void setup() {
 Wire.begin(); // begin Wire(I2C)
 Serial.begin(9600); // begin Serial
}

void loop() {

temp = sht.getTemperature(); // get temp from SHT 
 humidity = sht.getHumidity(); // get humidity from SHT

Serial.print("Temp: "); // print readings
 Serial.print(temp);
 Serial.print("t Humidity: ");
 Serial.println(humidity);

delay(85); // min delay for 14bit temp reading is 85ms
}

To use the code above, you will need the SHT21 library, available in the DOWNLOADS section.

Package Contents:

1x HTU21 Precision Temperature and Humidity Sensor, GY-21

1x Male Pin Header