Description

DHT22 Temperature and Humidity Sensor

The DHT22 Temperature and Humidity Sensor 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 outputs?a digital signal on the data pin. 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.
Simply connect the first pin on the left to 3-5V power, the second pin to your data input pin and the right most pin to ground. Although it uses a single-wire to send data it is not Dallas One Wire compatible! If you want multiple sensors, each one must have its own data pin! We have written an Arduino library with example code
Compared to the DHT11, this sensor is more precise, more accurate and works in a bigger range of temperature/humidity, but its larger and more expensive
Comes with a 4.7K ? 10K resistor, which you will want to use as a pullup from the data pin to VCC.

TECHNICAL DETAILS of DHT22/AM2302 Digital Temperature & Humidity Sensor

• 3 to 5V power and I/O
• 5mA max current use during conversion (while requesting data)
• Good for 0-100% humidity readings with 2-5% accuracy
• Good for -40 to 80?C temperature readings ?0.5?C accuracy
• No more than 0.5 Hz sampling rate (once every 2 seconds)
• Body size 27mm x 59mm x 13.5mm (1.05? x 2.32? x 0.53?)
• 4 pins, 0.1? spacing
• Weight (just the DHT22): 2.4g

Downloads:

• DHT22 datasheet
• Arduino library and example code
• Detailed usage tutorial

DHT22/AM2302 Digital Temperature & Humidity Sensor is a premium quality Humidity & Temperature Sensor.

All DHT22/AM2302 Digital Temperature & Humidity Measurement Sensor, TECH1120 are manufactured by using quality assured material and advanced techniques, which make them up to the standard in this highly challenging field.

DHT22/AM2302 Digital Temperature & Humidity Sensor is a 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).

It’s 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 sensor readings can be up to 2 seconds old. Simply connect the first pin on the left to 3-5V power, the second pin to your data input pin, and the rightmost pin to the ground. Although it uses a single wire to send data it is not Dallas One Wire compatible! If you want multiple sensors, each one must have its own data pin!

Simply connect the first pin on the left to 3-5V power, the second pin to your data input pin, and the rightmost pin to the ground. Although it uses a single wire to send data it is not Dallas One Wire compatible! If you want multiple sensors, each one must have its own data pin!

Features:

1. Type: AM2302.
2. Ultra-Low Power.
3. No Additional Components.
4. Long-Distance Signal Transmission.
5. All Calibration, Digital Output & Completely Interchangeable.
6. Relative Humidity & Temperature Measurement.
7. Humidity Measurement Precision: ±2-5% RH.
8. Temperature Measurement Precision: ±0.5 deg C.

Package Includes:

1 x DHT22/AM2302 Digital Temperature & Humidity Sensor