Humidity and Temperature. Available Languages. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin. In this tutorial you will learn how to use this sensor with Arduino uno. The DHT21 is a basic, 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.
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Humidity and Temperature. Available Languages. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin. In this tutorial you will learn how to use this sensor with Arduino uno. The DHT21 is a basic, 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.
Its fairly simple to use, but requires careful timing to grab data. The only real downside of this sensor is you can only get new data from it once every 2 seconds, so when using our library, sensor readings can be up to 2 seconds old. Download the code from here and open it with Arduino IDE. Inside you will also find and the DHT.
Open the serial monitor from tools menu of Arduino IDE. You have successfully completed one more Arduino "How to" tutorial and you learned how to use the DHT sensor.
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