DHT11 is a low-cost digital output basic temperature and humidity sensor. The DHT11 detects humidity by measuring the resistance between two electrodes. The humidity sensing component resistance changes with the water vapor present in the surrounding air. The DHT11 measures temperature with an NTC temperature sensor. The DHT11 sends data on a single line in digital format, so there is no need for ADC. The signal line needs to be pulled up by 10Kohm resistor to keep the signal line high by default. Here are the ranges of DHT11 Humidity Range: 20-90% RH Humidity Accuracy: ± 5% RH Temperature Range: 0-50 °C Temperature Accuracy: ±2 °C Operating Voltage: 3V to 5.5V Required Hardware: Arduino UNO DHT11 or DHT22 How to connect DHT11 with Arduino Uno: Here this schematic shows how to connect DHT11 with Arduino, if you are using DHT11 module then you can directly connect the signal pin to the Arduino, a pull-up resistor ...