Accuracy and DHT11

The DHT11 sensor is a basic temperature and humidity sensor, but its accuracy is relatively low compared to more advanced sensors like the DHT22 (AM2302) or SHT3x series.

📊 DHT11 Accuracy Specifications:

• Temperature Accuracy: ±2°C
• Humidity Accuracy: ±5% RH
• Temperature Range: 0°C to 50°C
• Humidity Range: 20% to 90% RH
• Sampling Rate: 1 reading per second (1Hz)

🔍 Why is DHT11’s Accuracy Limited?

1️⃣ Lower Resolution – It provides integer values (no decimals) for temperature.
2️⃣ Limited Humidity Range – Doesn’t measure below 20% RH, making it unreliable in dry conditions.
3️⃣ Plastic Casing – Slows down response time and affects precision.

✅ When is DHT11 Good Enough?

• If you need basic environmental monitoring (e.g., room conditions).
• If ±2°C accuracy is acceptable for your project.
• If you’re okay with a low refresh rate (1Hz).

❌ When to Use a Better Sensor?

• If you need higher accuracy (DHT22: ±0.5°C, ±2% RH).
• If you’re working with extreme temperatures (DHT22: -40°C to 80°C).
• If you want faster updates (e.g., SHT31, BME280).

🚀 Alternatives with Better Accuracy:

Verdict:
DHT11 is okay for simple projects but not for precision applications. If you need better accuracy, go for DHT22, SHT31, or BME280. 🚀

More about DHT11