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For measuring temperature this sensor uses a Negative Temperature coefficient thermistor, which causes a decrease in its resistance value with increase in temperature. To get larger resistance value even for the smallest change in temperature, this sensor is usually made up of semiconductor ceramics or polymers.
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1. Introduction DHT11 Temperature & Humidity Sensor features a temperature & humidity sensor complex with a calibrated digital signal output. By using the exclusive digital-signal-acquisition technique and temperature & humidity sensing technology, it ensures high reliability and excellent long-term stability.
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Temperature Range: 0-50 °C Temperature Accuracy: ±2% °C Operating Voltage: 3V to 5.5V The DHT11 Datasheet: DHT11 Datasheet What is Relative Humidity? The DHT11 measures relative humidity. Relative humidity is the amount of water vapor in air vs. the saturation point of water vapor in air.
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To measure the temperature, the DHT11 uses a negative temperature coefficient thermistor, which causes a decrease in the resistance value when there is an increase in temperature. Typically, the sensor is made of semiconductor ceramics or polymers to ensure a greater resistance value when there is even a slight change in temperature.
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The DHT11 Humidity and Temperature Sensor consists of 3 main components. A resistive type humidity sensor, an NTC (negative temperature coefficient) thermistor (to measure the temperature) and an 8-bit microcontroller, which converts the analog signals from both the sensors and sends out single digital signal.
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The DHT11 sensor can measure temperature and humidity in the air. It gives pre-calibrated digital output, so you can interface with any microcontroller like Arduino, ESP32, Raspberry Pi, etc.. The term "NTC" means "Negative Temperature Coefficient" which means its resistance decreases with increases in temperature.
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DHT11 Sensor. DHT11 can measure temperature from 0°C to 50°C with a ±2.0°C accuracy, and humidity from 20 to 80% with a 5% accuracy.. The term "NTC" stands for "Negative Temperature Coefficient," which means that resistance decreases as temperature rises.
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Pinout DHT11 has two forms: sensor and module. DHT11 sensor has four pins: GND pin: needs to be connected to GND (0V) VCC pin: needs to be connected to VCC (5V, or 3.3V) DATA pin: the pin is used to communicate between the sensor and Arduino NC pin: Not connected, we can ignore this pin
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Temperature Range: 0°C to 50°C Humidity Range: 20% to 90% Resolution: Temperature and Humidity both are 16-bit Accuracy: ±1°C and ±1% Note: Complete technical details can be found in the DHT11 datasheet linked at the bottom of the page. DHT11 Equivalent Temperature Sensors DHT22, AM2302, SHT71 Other Temperature Sensors:
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Code: Applications of DHT Sensor DHT stands for Digital Humidity and Temperature. The DHT sensor is a low-cost digital sensor for sensing temperature and humidity. This sensor can be easily interfaced with any micro-controller such as Arduino, Raspberry Pi to measure humidity and temperature instantaneously.
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0 I am trying to use DHT11 sensor with Arduino. But unfortunately it is returning following values: Temperature = 1.00 Humidity = 2.00 My code is as follows:
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For the second component on DHT11, it is a Negative Temperature Coefficient (NTC) thermistor, when the temperature is rising, the resistance will decrease as follow. The chip will use that to determine the environment temperature. 1.3. Specification ¶ Supply Voltage: 3.3V to 5V Range of Temperature reading: 0-50°C with +- 2°C accuracy
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DHT11 digital temperature and humidity sensor is a composite Sensor contains a calibrated digital signal output of the temperature and humidity. Application of a dedicated digital modules. GND ground, the negative power . Aosong(Guangzhou) Electronics Co.,Ltd. TEL：020-36042809 / 36380552 www.aosong.com - 3 -.
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The DHT11 performs readings at a frequency of once per second (1Hz sampling rate), whereas the DHT22 takes readings once every two seconds (0.5Hz sampling rate). Despite these disparities, both sensors operate within a voltage range of 3 to 5 volts, with a maximum current of 2.5mA during conversion.
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The DHT11 module features the AOSONG DHT11 digital temperature and humidity sensor at its core. DHT11 Sensor. The DHT11 sensor can accurately measure temperatures ranging from 0°C to 50°C with a precision of ±2.0°C. It can also measure humidity levels from 20% to 80% with a 5% accuracy.
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I need to monitor negative value temperature and as well as the Humidity, so I will be using DHT11. FYI, DHT11 doesn't do negative values. But the DHT12 will, and higher resolution as well. I also use a BME280 - I2C based Temperature, Humidity and Barometric sensor that is even better then the DHT12
