DHT11 Humidity and Temperature Sensor Module

🧠 What Is DHT11?
A basic digital sensor used to measure temperature and relative humidity.
Contains a capacitive humidity sensor and a thermistor.
Outputs calibrated digital data — no need for analog conversion.
🔍 Key Features
Dual Measurement: Temperature + Humidity
Digital Output: Single-wire communication
Low Cost & Easy to Use
Factory Calibrated
Low Power Consumption
Compact Module Form (with onboard resistor & PCB)
📊 Technical Specifications
Parameter
Value
Operating Voltage
3.3 V – 5 V
Temperature Range
0 °C to 50 °C
Humidity Range
20% to 90% RH
Temperature Accuracy
±2 °C
Humidity Accuracy
±5% RH
Resolution
1 °C, 1% RH
Sampling Rate
1 Hz (1 reading/sec)
Output Type
Digital (single-wire protocol)
⚙️ Pin Configuration (Module Version)
VCC → Power supply (3.3V–5V)
GND → Ground
DATA → Digital signal output
📌 Note:
Module version usually includes a pull-up resistor, so no external resistor is needed.
🧠 How It Works
Humidity sensing element detects moisture level (capacitive method).
Thermistor measures temperature.
Internal IC converts readings into digital signal.
Data is transmitted to a microcontroller using a single data pin.
📌 Applications
Weather monitoring systems
Home automation (HVAC control)
Greenhouse & agriculture monitoring
IoT environmental sensing
Basic data logging projects
⚠️ Important Notes
Low Accuracy: Not suitable for precise/industrial applications.
Slow Response: Only updates once per second.
Limited Range: Compared to advanced sensors like DHT22 or SHT series.
Avoid Condensation: Direct water exposure can damage readings.
🛠 Summary
Type: Digital temperature & humidity sensor
Interface: Single-wire digital
Power: 3.3–5 V
Use Case: Basic environmental monitoring