Description
The DHT-22 Digital Temperature & Humidity Sensor is the high-accuracy upgrade to the DHT-11 — measuring temperature from -40°C to 80°C with ±0.5°C precision and relative humidity from 0% to 100% RH with ±2–5% accuracy. If your project demands reliable climate data rather than approximate readings, the DHT-22 is the right choice.
Using the same simple single-wire digital protocol as the DHT-11, the DHT-22 works with Arduino, ESP32, and ESP8266 using the same Adafruit DHT library — just change one line of code. Perfect for weather stations, greenhouse systems, industrial climate monitoring, and any project where precision matters in Bangladesh.
⭐ Key Features
Wide Temperature Range
-40°C to 80°C — covers outdoor and cold environments
High Accuracy ±0.5°C
4x more accurate than DHT-11 — suitable for precision builds
Full 0–100% Humidity Range
Measures full humidity range — including near-saturation levels
Single Wire Digital Output
Only VCC, GND, DATA — same easy wiring as DHT-11
3.3V and 5V Compatible
Works with Arduino (5V), ESP32 and ESP8266 (3.3V)
Same Library as DHT-11
Adafruit DHT library — just change DHT11 to DHT22 in code
🚀 What Can You Build With the DHT-22?
🌿
Greenhouse Monitoring
Precise climate control for plant growth systems
🌦️
Outdoor Weather Station
Wide range makes it suitable for outdoor deployment
🏭
Industrial Monitoring
Server rooms, storage facilities and cold chain logging
🌐
IoT Cloud Dashboards
Accurate readings pushed to ThingSpeak, MQTT, Blynk
🏠
HVAC Automation
Trigger AC, fans and humidifiers based on readings
👤 Who Should Buy This?
🎓 Beginners
Already used DHT-11 and want better accuracy — same wiring and code with just one word changed
📚 Students
Projects requiring precise climate data — greenhouse systems, environmental monitoring thesis work
⚙️ Engineers
Professional IoT devices, HVAC controllers and industrial environment monitoring systems
🛠️ Hobbyists
Makers who want reliable outdoor readings, mushroom or plant grow tent monitoring
⚔️ DHT-22 vs DHT-11 vs DS18B20 vs LM35 — Which Sensor Is Right For You?
A complete comparison to help you pick the right temperature sensor
| Feature | THIS ITEM DHT-22 | BUDGET DHT-11 | WATERPROOF DS18B20 | ANALOG LM35 |
|---|---|---|---|---|
| Temp Range | -40°C to 80°C | 0°C to 50°C | -55°C to 125°C | -55°C to 150°C |
| Temp Accuracy | ±0.5°C ✅ Precise | ±2°C | ±0.5°C | ±0.5°C |
| Humidity | ✅ 0–100% RH | ✅ 20–90% RH | ❌ No | ❌ No |
| Output Type | Digital | Digital | Digital (1-Wire) | Analog |
| Waterproof | ❌ No | ❌ No | ✅ Available | ❌ No |
| Best For | Precise indoor/outdoor | Budget indoor builds | Liquid & outdoor temp | Simple analog use |
🔧 Features & Specifications
💻 Quick Start — DHT-22 Example Code
DHT-22 Read Temperature & Humidity
#include "DHT.h" #define DHTPIN 4 // GPIO4 on ESP32 / D2 on Arduino #define DHTTYPE DHT22 // ← Only change from DHT-11 code DHT dht(DHTPIN, DHTTYPE); void setup() { Serial.begin(115200); dht.begin(); } void loop() { delay(2000); float humidity = dht.readHumidity(); float temperature = dht.readTemperature(); if (isnan(humidity) || isnan(temperature)) { Serial.println("Failed to read! Check wiring."); return; } Serial.print("Temperature: "); Serial.print(temperature); Serial.println(" °C"); Serial.print("Humidity: "); Serial.print(humidity); Serial.println(" %"); }
The only difference from DHT-11 code is DHT22 instead of DHT11 on the #define line.
❓ Frequently Asked Questions
🔗 Other Temperature Sensors From Dream RC
DHT-11 Temperature & Humidity Sensor Module
On a budget? The DHT-11 is the most affordable temperature and humidity sensor for indoor use — perfect for learning projects and basic climate monitoring at 119 BDT.
DS18B20 Digital Temperature Sensor (TO-92)
Need to measure liquid or soil temperature? The DS18B20 measures -55°C to 125°C with a waterproof probe option — ideal for water tanks, soil and outdoor environments.
LM35 Temperature Sensor
Prefer an analog output? The LM35 outputs voltage directly proportional to temperature — no library needed, works with any microcontroller’s analog input pin.
📦 Package Includes
1 × DHT-22 Digital Temperature & Humidity Sensor
Bare sensor — 10kΩ pull-up resistor required on data line if not using a module board
💬 DHT-22 Sensor Price in BD & Why Buy From Dream RC?
The DHT-22 Digital Temperature & Humidity Sensor price in BD is 249 BDT. Buy the DHT-22 in Bangladesh from Dream RC — your trusted source for sensors and IoT components at the best price with fast delivery and Cash on Delivery nationwide.
Pay after receiving
Quick processing
69 BDT — 24 hrs
129 BDT — 24–72 hrs