DHT11 Digital Relative Humidity Temperature Sensor Module Compatible with Arduino, Arm And Other MCU

PRODUCT OVERVIEW:

• DHT11 sensor with PCB and LED indicator along with cable; 3 to 5V power and I/O, 4 pins with 0.1″ spacing

• The board has pre-built 4.7K or 10K resistor, which you will need to use as a pull-up from the data pin to VCC.

• 5mA max current use during conversion (while requesting data)

• Good for 20-80% humidity readings with 5% accuracy

• Good for 0-50°C temperature readings ±2°C accuracy.

Specification

Humidity Measuring Range(%)	20 to 90
Temperature Measuring Range(°C)	0 to +50
Humidity Measurement Accuracy(%)	±5.0
Temperature Measurement Accuracy(°C)	±2.0
Response Time(s)	<5
Input Supply Voltage (VDC)	5
Breadboard Size(mm)	19×17 (LxW)
Weight (gm)	0.6
Shipment Weight	0.095 kg
Shipment Dimensions	4 × 4 × 1 cm

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The DHT11 is a basic, ultra low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and spits out a digital signal on the data pin (no analog input pins needed). It’s fairly simple to use but requires careful timing to grab data.

HOW THE DHT11 MEASURES HUMIDITY AND TEMPERATURE

The DHT11 detects water vapor by measuring the electrical resistance between two electrodes. The humidity sensing component is a moisture holding substrate with electrodes applied to the surface. When water vapor is absorbed by the substrate, ions are released by the substrate which increases the conductivity between the electrodes.

The change in resistance between the two electrodes is proportional to the relative humidity. Higher relative humidity decreases the resistance between the electrodes, while lower relative humidity increases the resistance between the electrodes.

The DHT11 measures temperature with a surface mounted NTC temperature sensor (thermistor) built into the unit.

Applications:

This sensor is used in various applications such as measuring humidity and temperature values in heating, ventilation and air conditioning systems. Weather stations also use these sensors to predict weather conditions. The humidity. sensor is used as a preventive measure in homes where people are affected by humidity.  Offices, cars, museums, greenhouses and industries use this sensor for measuring humidity values and as a safety measure.

1 X DHT11