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Detailed Comparison
DHT11 vs DHT22: Temperature Sensor Comparison
Both are popular temperature and humidity sensors, but the DHT22 offers better specs. Is it worth the extra cost?
DHT22 (AM2302)
VS
DHT11
DHT22 (AM2302)
The DHT22 is a more accurate and wider-range temperature and humidity sensor, preferred for weather stations and precision applications.
DHT11
The DHT11 is a basic, low-cost temperature and humidity sensor suitable for simple indoor monitoring applications.
Specifications Comparison
| Specification | DHT22 (AM2302) | DHT11 |
|---|---|---|
| Temperature Range | -40°C to 80°C | 0°C to 50°C |
| Temperature Accuracy | ±0.5°C | ±2°C |
| Humidity Range | 0% - 100% RH | 20% - 80% RH |
| Humidity Accuracy | ±2% RH | ±5% RH |
| Sampling Rate | 0.5 Hz (every 2s) | 1 Hz (every 1s) |
| Operating Voltage | 3.3V - 6V | 3.3V - 5.5V |
| Output | Digital (single-wire) | Digital (single-wire) |
| Price (India) | ₹180 - ₹350 | ₹50 - ₹100 |
DHT22 (AM2302)
Pros
- Wide temperature range (-40 to 80°C)
- High accuracy (±0.5°C)
- Full humidity range (0-100%)
- Better long-term stability
- Ideal for outdoor/weather stations
Cons
- More expensive than DHT11
- Slower sampling (every 2 seconds)
- Larger physical size
DHT11
Pros
- Very affordable
- Faster sampling rate (1 Hz)
- Compact size
- Good for basic learning projects
- Easy to find and use
Cons
- Limited temperature range (0-50°C)
- Lower accuracy (±2°C)
- Cannot measure below 0°C
- Limited humidity range (20-80%)
Our Recommendation
Choose **DHT11** for indoor room monitoring or learning projects where cost is a priority. Choose **DHT22** for weather stations, outdoor projects, or any application requiring accurate measurements.
The Verdict
The DHT22 is worth the extra cost for any serious project. Its wider range and better accuracy make it the standard for IoT weather monitoring.