The DHT11 sensor is a basic but cost-effective sensor suitable for applications where moderate accuracy is sufficient. It provides temperature and humidity readings in a digital format, making it easy to interface with microcontrollers and other digital systems. However, please note that the DHT11 sensor has lower accuracy and a slower response time compared to more advanced sensors like the DHT22 or the SHT series sensors.
DHT 11 Sensor
Specification
- Temperature Range: 0°C to 50°C (32°F to 122°F)
- Temperature Accuracy: ±2°C
- Humidity Range: 20% to 90% RH
- Humidity Accuracy: ±5% RH
- Voltage Supply: 3.3V to 5V DC
- Current Consumption: 2.5mA max (during conversion)
- Sampling Rate: 1 Hz (one reading per second)
- Response Time: 2 seconds (to reach 63% of actual temperature)
- Interface: Single-bus digital signal
- Communication Protocol: Uses a single-wire communication protocol
- Sensor Type: Capacitive humidity and thermistor-based temperature sensor
- Output: Digital output (temperature and humidity values are converted to digital signals)
- Resolution: Temperature - 1°C, Humidity - 1% RH
- Operating Voltage Range: 3.3V to 5.5V
- Dimensions: 12mm x 15.5mm x 5.5mm
Usage
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The DHT11 sensor has three pins: VCC, Data, and GND.
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VCC (or VDD): Connect this pin to the positive supply voltage, typically 3.3V or 5V, depending on the operating voltage of your system.
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Data: This pin is used for communication with the sensor. Connect it to a digital input/output (I/O) pin of your microcontroller or development board.
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GND: Connect this pin to the ground (0V) of your system.