sensors

DHT22

Every spec below is cited to the manufacturer datasheet. Compare the closest alternatives, then ask the assistant what it means for your design.

00 — Overview

What the DHT22 does

This user guide covers the DHT22 digital temperature and humidity sensor module. It explains the product's overview, physical dimensions, and key features such as digital I2C output and low power consumption. The document details performance characteristics including a 0-100% humidity range and ±0.5°C accuracy, along with electrical specifications like 3.3V operation and response times. It serves as a reference for integrating this stable, high-precision sensor into electronic projects.

Next step
Start building with DHT22 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.
01 — Key specifications

Datasheet parameters

Datasheet parameters for DHT22
ParameterMinTypMaxConditionsSource
supply voltage range 2.8 V — 5.5 V Aosong datasheet, p. 3 — 表 3 Io 表示低电平输出电流 Rp 代表上拉电阻
operating temperature -40 °C — 80 °C Aosong datasheet, p. 3 — 温度
standby current — 200 nA — 休眠模式 (sleep mode), typical Aosong datasheet, p. 3 — 表 3 Io 表示低电平输出电流 Rp 代表上拉电阻
sample rate — 500 mHz — 采样周期 2.0 s typical Aosong datasheet, p. 3 — 表 3 Io 表示低电平输出电流 Rp 代表上拉电阻
02 — Alternatives

Closest matches to DHT22

TMP102 8.0× higher sample rate, 3.3× lower rise time, 2.1× higher operating temperature
BME280 2.3× lower supply voltage range, 1.2× higher operating temperature, similar standby current
DS18B20 5.0× higher sample rate, 3.8× higher standby current, 1.8× higher operating temperature
MAX31820 3.8× higher standby current, 2.7× higher sample rate, 1.8× higher operating temperature
MAX31820MCR+ 3.8× higher standby current, 2.7× higher sample rate, 1.8× higher operating temperature
TMP112 8.0× higher sample rate, 3.3× lower rise time, 2.5× higher standby current
LSM6DS3TR-C 15.0× higher standby current, 2.3× lower supply voltage range, 1.1× higher operating temperature
MAX31865 5.0× lower rise time, 2.1× higher operating temperature, 1.3× lower supply voltage range
03 — FAQ

Frequently asked questions

What is the maximum operating temperature for the DHT22?

The maximum operating temperature is 80 °C.

What is the sample rate of the DHT22?

The sample rate is 500 mHz with a sampling period of 2.0 s typical.

What is the typical standby current of the DHT22 in sleep mode?

The typical standby current is 200 nA in sleep mode.

What is the maximum supply voltage for the DHT22?

The maximum supply voltage is 5.5 V.

Design help What do I need around the DHT22? →