DHT22 Digital Temperature and Humidity Sensor Module AM2302 High-Accuracy
Capture precise climate diagnostics with the DHT22 (AM2302) High-Accuracy Digital Temperature and Humidity Sensor Module. Delivering a step up in performance over basic climate sensors, this module measures relative humidity across a full 0% to 100% range and temperatures from -40°C to +80°C. Utilizing a calibrated, single-wire digital interface, it transmits rock-solid environmental telemetry directly to your microcontroller, making it the ideal choice for indoor weather stations, humidor monitors, greenhouse automation controllers, and HVAC tracking units.
₹ 101
₹ 165
The DHT22 (AM2302) High-Accuracy Digital Temperature and Humidity Sensor Module is an advanced, pre-calibrated environmental sensing component engineered to deliver superior range and accuracy compared to standard entry-level sensors like the DHT11. Housed within a rugged, well-ventilated plastic casing, the module houses a capacitive polymer sensing element for tracking relative humidity alongside a high-precision NTC thermistor for temperature capture. An onboard 8-bit microcontroller processes these raw analog fluctuations, applies factory-calibrated coefficients stored in internal OTP memory, and converts them into a clean digital data stream.
This component relies on a custom single-wire (1-Wire style) serial bus format to broadcast data packages. This means it only requires one digital I/O pin on your microcontroller to process both temperature and humidity packets, significantly reducing wire routing complexity. Thanks to the integrated signal-filtering hardware on the module board, it supports long-distance signal transmission layouts up to 20 meters, allowing you to place the sensor head deep inside ventilation ducts or agricultural greenhouses while keeping your main logic boards safe inside a central control box.
Key Features & Benefits:
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Superior Accuracy Specifications: Offers a highly precise ±2% Relative Humidity accuracy margin and a tight ±0.5°C temperature resolution, easily outperforming standard entry-level alternatives.
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Full-Scale Operating Spectrum: Captures sub-zero temperatures down to -40°C and tracks up to +80°C, enabling reliable operation in industrial refrigeration units or extreme summer heatwaves.
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Streamlined Single-Bus Wiring: Condenses your telemetry lines into a single digital data link, freeing up valuable processing pins for additional relays or displays.
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Excellent Long-Term Stability: The capacitive sensing array is highly resistant to chemical contamination, ensuring your data outputs won't drift out of calibration after months of continuous deployment.
Technical Specifications
| Feature | Specification |
| Core Transducer Model | DHT22 / AM2302 Composite Sensor |
| Data Signal Interface | Single-Bus Digital Protocol (Custom Single-Wire) |
| Humidity Sensing Scope | 0% to 100% RH (Relative Humidity) |
| Temperature Sensing Scope | -40°C to +80°C |
| Humidity Precision Error Margin | $pm$ 2% RH (Typical) |
| Temperature Precision Error Margin | $pm$ 0.5°C |
| Resolution Scale | 0.1% RH | 0.1°C |
| Operational Supply Voltage ($V_{DD}$) | 3.3V to 5.5V DC |
| Active Power Draw Profile | 1.5 mA (During active data requests) | 40 µA (Standby state) |
| Sampling Interval Period | 2.0 Seconds (Recommended minimum delay between reads) |
Module Interface & Pin Allocation Mapping:
The module layout breaks out the raw sensor pins into a standard 3-pin or 4-pin arrangement with an integrated pull-up resistor on the board, simplifying connection steps:
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VCC: Power input line. Connect to a stable 3.3V to 5.5V DC supply rail.
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DATA: The single-wire bidirectional serial data channel. Connect directly to a digital pin on your microcontroller with a pull-up connection.
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GND: Connect to common system ground ($GND$).
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