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DHT21 Temperature & Humidity Sensor Module AM2301
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Rs.700.00
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DHT21 Temperature & Humidity Sensor Module AM2301
The DHT21 (AM2301) is an upgraded version of the popular DHT11, offering a wider temperature range, higher accuracy, and better stability. It uses a capacitive humidity sensor and a thermistor to measure ambient temperature and humidity, outputting calibrated digital data over a single-wire interface. A must-have for weather stations, HVAC systems, and environmental monitoring projects with Arduino or ESP32.
Technical Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 3.3V – 5V DC |
| Output Interface | Single-wire digital (1-Wire) |
| Temperature Range | -40°C to +80°C |
| Temperature Accuracy | ±0.5°C |
| Humidity Range | 0% – 100% RH |
| Humidity Accuracy | ±3% RH |
| Sampling Rate | 0.5 Hz (one reading every 2 seconds) |
| Resolution | 0.1°C / 0.1% RH |
| Operating Temperature | -40°C to +80°C |
Pinout
| Pin | Name | Description |
|---|---|---|
| 1 | VCC | 3.3V or 5V Supply |
| 2 | DATA | Single-wire data output (add 10kΩ pull-up) |
| 3 | NC | Not connected |
| 4 | GND | Ground |
Key Features
- Wide temperature range: -40°C to +80°C — better than DHT11
- Full humidity range: 0% to 100% RH
- High accuracy: ±0.5°C temperature, ±3% RH humidity
- Single-wire interface — only one GPIO pin needed
- Compatible with DHT11/DHT22 libraries on Arduino, ESP32, STM32
Applications
- Weather stations and environmental monitoring
- HVAC and climate control systems
- Greenhouse and agriculture monitoring
- Cold chain and storage temperature logging
- IoT smart home humidity and temperature nodes