The DHT22 (also known as AM2302) is a popular, low-cost digital temperature and humidity sensor widely used in electronics and IoT projects. It uses a capacitive humidity sensing element and a negative temperature coefficient (NTC) thermistor to capture environmental data. A built-in 8-bit microcontroller processes these readings and transmits them as a calibrated digital signal over a single-wire bus.Technical SpecificationsAccording to official device documentation hosted on Adafruit and WaveShare, the sensor boasts the following performance characteristics:

• Operating Voltage: 3.3V to 5.5V DC
• Current Consumption: 2.5mA maximum during active data conversion; 4060A during standby
• Temperature Range: -40C to 80C
• Temperature Accuracy: 0.5C with a resolution of 0.1C
• Humidity Range: 0% to 100% Relative Humidity (RH)
• Humidity Accuracy: 2% RH (typically at 25C) with a resolution of 0.1% RH
• Sampling Rate: 0.5 Hz (takes a new reading once every 2 seconds)