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 | 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) |
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Pin Configuration (Module Version)
VCC Power supply (3.3V5V)
GND Ground
DATA Digital signal output
Note:
Module version usually includes a pull-up resistor, so no external resistor is needed.
How It Works
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:
Summary
Type: Digital temperature & humidity sensor
Interface: Single-wire digital
Power: 3.35 V
Use Case: Basic environmental monitoring<