سنسور رطوبت و دما DHT22 / AHT20

Introduction

The DHT22 / AHT20  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). It’s fairly simple to use, but requires careful timing to grab data.

Grove AHT20 Temperature and Humidity sensor is based on AHT20, compared with Grove – Temperature & Humidity Sensor Pro (AM2302/DHT22), AHT20 is a new generation of temperature and humidity sensor embedded with a dual-row flat and no-lead SMD package, suitable for the reflow soldering. AHT20 is equipped with a newly designed ASIC chip: an improved MEMS semiconductor capacitive humidity sensor, and a standard on-chip temperature sensor. The output is I2C protocol with the Grove interface.

The performance of AHT20 is more stable in harsh environments compared with the previous generation of temperature and humidity sensor, as a matter of fact, AHT20 is fittable in most industrial scenarios.

Features

Temperature measurement range -40 ~ 85°C, Humidity measurement range 0 ~ 100% RH
Digital output, Grove I2C interface
Excellent long-term stability
SMD package suitable for reflow soldering
Quick response and strong anti-interference ability
Compatible with Arduino
4-pin interface reserved

Specifications

Operating Voltage: DC:2.0-5.5V
Measuring Range (humidity) 0 ~ 100% RH
Temperature Range: -40 ~ + 85 ℃
Humidity Accuracy: ± 2% RH (25 ℃)
Temperature Accuracy ± 0.3 ℃
Resolution: Temperature: 0.01 ℃, Humidity: 0.024% RH
Output Interface: Grove I²C Interface
I2C address: 0x38
Dimensions : 24x20x12(mm)