When the temperature changes, the resistance of the NTC also changes. What’s the sampling rate of a DHT11 sensor?Īs already mentioned, DHT11 has an NTC thermistor and humidity sensing components. How accurate is DHT11?ĭHT11 can measure temperature from 0-50⁰C with a 2% accuracy and relative humidity from 20-80% with an accuracy of 5%. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and sends data through a 1-wire protocol. The DHT11 is a basic, ultra-low-cost digital temperature and humidity sensor. An LED with a current limit resistor is used as a power indicator.Ĭommonly Asked Questions about DHT11 Sensor Q. Sufficient filtering is provided with the tantalum and multilayer capacitors. The VCC and GND are directly connected to the DHT11 and a pullup resistor is added to the DATA pin. As mentioned earlier, the board has a very low components count. The schematic diagram for the DHT11 module is given below. The DHT11 module has only a very low number of parts that includes the DHT11, pullup resistor, bypass capacitor, and power led with a current limiting resistor. VCC Provides power for the module, Connect to the 5V pin of the Arduino. GND Ground Connected to Ground pin of the Arduino.

The pinout of a DHT11 Sensor module is as follows: In which two are for power and one is for communication. These are connected to a high-performance 8-bit microcontroller, offering excellent quality, fast response, anti-interference ability, and cost-effectiveness. This sensor includes an NTC for temperature measurement and a resistive-type humidity measurement component for humidity measurement. The exclusive digital-signal-acquisition technique and temperature & humidity sensing technology ensure high reliability and excellent long-term stability. DHT11 Module features a temperature & humidity sensor complex with a calibrated digital signal output.

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