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ESP32 with DHT11 Temperature & Humidity Sensor

17-06-2025

📌 What is the DHT11 Sensor?

The DHT11 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and outputs a digital signal on the data pin (no analog input needed).

🧠 Key Features of DHT11

Feature	Details
Temperature Range	0 to 50°C (±2°C accuracy)
Humidity Range	20% to 90% RH (±5% accuracy)
Operating Voltage	3V to 5.5V
Signal Type	Digital (single-wire serial)
Sampling Rate	1 Hz (one reading per second)
Size	Small and lightweight

⚙️ Pinout of DHT11 Sensor

Pin	Name	Description
1	VCC	Power supply (3.3V or 5V)
2	Data	Serial data output
3	NC	Not connected
4	GND	Ground

(Sometimes it comes in a 3-pin module: VCC, DATA, GND)

📦 How It Works

Humidity Measurement: It uses a capacitive sensor to measure humidity.
Temperature Measurement: A thermistor changes resistance with temperature.
The sensor has a built-in microcontroller that converts analog signals to calibrated digital signals, sent to the microcontroller via one wire.