---
product_id: 405964647
title: "AZDelivery GY-21 HTU21 Humidity and Temperature Sensor Module SHT21 with I2C Interface compatible with Arduino and Raspberry Pi including E-Book!"
brand: "azdelivery"
price: "3.80 OMR"
currency: OMR
in_stock: true
reviews_count: 2
url: https://www.desertcart.com.om/products/405964647-azdelivery-gy-21-htu21-humidity-and-temperature-sensor-module-sht21
store_origin: OM
region: Oman
---

# Precision humidity tracking I2C interface compatibility Accurate temp sensing AZDelivery GY-21 HTU21 Humidity and Temperature Sensor Module SHT21 with I2C Interface compatible with Arduino and Raspberry Pi including E-Book!

**Brand:** azdelivery
**Price:** 3.80 OMR
**Availability:** ✅ In Stock

## Summary

> 🌟 Elevate Your Projects with Precision!

## Quick Answers

- **What is this?** AZDelivery GY-21 HTU21 Humidity and Temperature Sensor Module SHT21 with I2C Interface compatible with Arduino and Raspberry Pi including E-Book! by azdelivery
- **How much does it cost?** 3.80 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/405964647-azdelivery-gy-21-htu21-humidity-and-temperature-sensor-module-sht21)

## Best For

- azdelivery enthusiasts

## Why This Product

- Trusted azdelivery brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seamless Integration:** Easily connects with Arduino & Raspberry Pi for instant project kick-off.
- • **Bonus E-Book Included:** Get started quickly with our comprehensive guide and project examples.
- • **No Calibration Needed:** Enjoy hassle-free setup with full interchangeability in standard conditions.
- • **Instantaneous Response:** Experience rapid desaturation after saturation phases for reliable readings.
- • **Versatile Applications:** Perfect for automotive, HVAC, medical, and home automation projects.

## Overview

The AZDelivery GY-21 HTU21 Humidity and Temperature Sensor Module is a highly accurate, easy-to-use sensor compatible with Arduino and Raspberry Pi. It features an I2C interface, requires no calibration under standard conditions, and comes with an informative E-Book to streamline your project setup.

## Description

Our AZDelivery GY-21 HTU21 is a reliable and durable module for determining temperature and humidity values. Thanks to the I2C interface, the sensor is compatible with most 3.3V and 5V microcontrollers such as ESP and Raspberry Pi, and it allows effortless programming. As an additional convenience, there are free available libraries for easy use with Raspberrys. The sensor breakout is equipped with the original HTU21 chip and represents a real alternative to the well-known DHT22. Typical measurement accuracy for temperature is: +/-1°C deviation between -30°C and 90°C, and for humidity: +/-2% RL between 5% and 95% RL. For top quality Raspberry Pi products, AZ-Delivery Vertriebs is your go to.  We provide an array of application examples, full installation guides, eBooks, libraries, and all-round assistance.  AZ-Delivery, your microelectronics expert.

## Features

- ✅ The GY-21 is a new easy to use and highly accurate sensor extremely compatible with Raspberry Pi, and carries an HTU21 digital humidity and temperature sensor chip.     ✅ Some of its features are: full interchangeability with no calibration required in standard conditions, instantaneous desaturation after long periods in saturation phase, compatible with automatized assembly processes including Pb free and reflow processes and individual marking for compliance to stringent traceability requirements.     ✅ This Humidity and Temperature Sensor uses the I2C interface and its supply voltage must be in the range of 1.5VDC - 3.6VDC (recommended supply voltage is 3VDC).     ✅ AZ-Delivery GY 21 Sensor is suitable for: automotive (defogging, HVAC), home appliances, medical, printers, and it makes the perfect choice for weather station or humidor control system.     ✅ This product includes an E-Book that provides useful information on how to begin your project, it helps with a quick setup and saves time on the configuration process. We provide an array of application examples, full installation guides and libraries.

## Images

![AZDelivery GY-21 HTU21 Humidity and Temperature Sensor Module SHT21 with I2C Interface compatible with Arduino and Raspberry Pi including E-Book! - Image 1](https://m.media-amazon.com/images/I/710S6Ii3PkS.jpg)
![AZDelivery GY-21 HTU21 Humidity and Temperature Sensor Module SHT21 with I2C Interface compatible with Arduino and Raspberry Pi including E-Book! - Image 2](https://m.media-amazon.com/images/I/71PnO63kKrS.jpg)
![AZDelivery GY-21 HTU21 Humidity and Temperature Sensor Module SHT21 with I2C Interface compatible with Arduino and Raspberry Pi including E-Book! - Image 3](https://m.media-amazon.com/images/I/71-5BoEZn6S.jpg)
![AZDelivery GY-21 HTU21 Humidity and Temperature Sensor Module SHT21 with I2C Interface compatible with Arduino and Raspberry Pi including E-Book! - Image 4](https://m.media-amazon.com/images/I/71GkfV6T9gS.jpg)
![AZDelivery GY-21 HTU21 Humidity and Temperature Sensor Module SHT21 with I2C Interface compatible with Arduino and Raspberry Pi including E-Book! - Image 5](https://m.media-amazon.com/images/I/71cCaArJgAS.jpg)

## Available Options

This product comes in different **Number Of Items** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    not a bad thing to say.
  

*by M***Y on Reviewed in the United Kingdom on 16 October 2019*

so I have connected this to a RPi zero w, and from what i can tell from some quick googling - you can read the data raw using address's or you can use the ardunio library (see below). I chose the latter. The sensor connects to i2c, and such i can use the same 2 data pins for multiple sensors and interfaces, like the bme280, an alternative to this.Basically its just as good but i didnt even need to call the 0x40 address using the library. Code is SOOO simple gona post it below. After soldering the header pins and plugging in, it just worked. No hassle.Also AZDelivery emailed me a detailed datasheet and other documents relating to the sensor promptly without me even asking. Nice touch.sudo pip3 install adafruit-circuitpython-htu21dread_htu.py:import timeimport boardimport busiofrom adafruit_htu21d import HTU21D# Create library object using our Bus I2C porti2c = busio.I2C(board.SCL, board.SDA)sensor = HTU21D(i2c)while True:  print("\nTemperature: %0.1f C" % sensor.temperature)  print("Humidity: %0.1f %%" % sensor.relative_humidity)  time.sleep(2)

### ⭐⭐⭐ 







  
  
    Inaccurate readings
  

*by M***R on Reviewed in the United Kingdom on 1 February 2021*

The sensor seems to be providing inaccurate temperature and humidity readings. I'm using Adafruit's Python libraries to read the sensor data. After logging readings over the course of a day and comparing against readings from 2 other temperature and humidity monitors the discrepancy is too high (+-5C / +- 16% avg.). I may have a faulty unit so I will order another one and update this review if necessary.

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-02-24*