DHT22 / AM2302 Temperature and Humidity Sensor Module

Higher-accuracy digital temperature (-40 to 80C) and humidity (0-100% RH) sensor, upgrade over DHT11.

₹199 + 18% GST

SKU: BOTBIT-SEN-02 · Best for: IoT weather stations needing accurate outdoor readings

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Overview

About DHT22 / AM2302 Temperature and Humidity Sensor Module.

The DHT22, also sold as the AM2302, is a higher-accuracy digital temperature and humidity sensor and the natural upgrade from the DHT11. Like the DHT11 it uses a single-wire digital interface, but it offers a much wider measurement range and significantly better precision, making it suitable for real weather stations and outdoor monitoring.

It reads temperature from -40 to 80C and relative humidity across the full 0 to 100% RH range, with roughly +/-0.5C temperature accuracy and +/-2-5% RH humidity accuracy. The module includes the onboard pull-up resistor, so wiring stays as simple as VCC, DATA and GND.

For Indian makers building serious IoT weather nodes, cold-storage monitors or agricultural sensors, the DHT22 hits the sweet spot: far more accurate than the DHT11 while remaining cheap, single-wire and supported by the same familiar Arduino libraries.

Key features

Why it stands out.

Wide -40 to 80C temperature range including sub-zero measurement

Full 0 to 100% RH humidity range with +/-2-5% accuracy

High temperature accuracy of about +/-0.5C

Single-wire digital output, drop-in compatible with DHT11 wiring and libraries

Onboard pull-up resistor on the module version for direct 3-wire connection

Works from 3.3V to 6V with Arduino, ESP8266, ESP32 and Raspberry Pi

Specifications

Selection facts.

Sensor Type	Capacitive humidity + thermistor, digital output
Temperature Range	-40 to 80 degC
Temperature Accuracy	+/-0.5 degC
Humidity Range	0 to 100% RH
Humidity Accuracy	+/-2% RH (typical), up to +/-5% RH at extremes
Resolution	0.1 degC / 0.1% RH (16-bit)
Sampling Rate	0.5 Hz (one reading every 2 seconds)
Supply Voltage	3.3V to 6V DC
Interface	Single-wire proprietary digital (1 data pin)
Pins	3-pin module (VCC, DATA, GND) or 4-pin bare sensor

Applications

Where it is used.

IoT weather stations needing accurate outdoor readings
Cold-storage and refrigeration monitoring (sub-zero capable)
Agriculture, greenhouse and soil-environment monitoring
Server room and HVAC environment logging
Home automation temperature/humidity nodes over Wi-Fi
Data logging and research projects requiring better precision than DHT11

Buying guide

How to choose.

Choose the DHT22/AM2302 when you need real accuracy, sub-zero temperatures, or the full humidity range, for example an outdoor weather station, a cold-storage alarm or an agricultural sensor. If you only need approximate indoor readings for learning, the cheaper DHT11 is enough.

It is a drop-in upgrade: the wiring and libraries are the same as the DHT11, so you only change the sensor type in your code. Use the 3-pin module version so the pull-up resistor is already fitted. Pair it with an ESP32 or ESP8266 for Wi-Fi logging, or an Arduino for standalone loggers.

If you also need barometric pressure or altitude, consider the BME280 instead, which adds pressure over I2C. For the fastest, simplest accurate temperature/humidity node, the DHT22 remains the standard pick.

FAQ

Common questions.

Is the DHT22 the same as the AM2302?

Yes. AM2302 is the wired/module version of the same sensor. Electrically and in code they are treated identically (sensor type DHT22).

Can I reuse my DHT11 wiring and code?

Yes. The DHT22 uses the same single-wire interface and pinout. Just connect VCC, DATA and GND, and change the sensor type to DHT22 in the Adafruit DHT or DHTlib library.

How often can I read it?

The DHT22 samples about once every 2 seconds (0.5 Hz), so read it no faster than that. Reading too quickly returns the previous or failed value.

Does it measure negative temperatures?

Yes, it measures down to -40C, unlike the DHT11 which starts at 0C. This makes it suitable for cold-storage and outdoor winter monitoring.

Is it available in India and what comes in the box?

Yes, the DHT22/AM2302 is widely stocked in India. You typically receive one DHT22 module (3-pin blue PCB with onboard pull-up) or the AM2302 with a short cable; jumper wires are usually separate.