AHT21B Digital Temperature and Humidity Sensor Module
$2.201pcs
AHT21B: I2C digital temperature/humidity sensor with high accuracy, fast response, and wide operating range for environmental monitoring.
| Dimensions | 12.0 × 12.0 mm |
|---|---|
| Brand |
easyelecmodule |
6522 in stock
Product Introduction
The AHT21B Digital Temperature and Humidity Module is a calibrated composite sensor that provides digital signal output for temperature and humidity measurements. Utilizing dedicated digital module acquisition technology along with advanced temperature and humidity sensing technology, it ensures exceptionally high reliability and outstanding long-term stability. The product features excellent quality, fast response, strong anti-interference capability, and high cost-effectiveness. Each sensor is calibrated in a professional temperature-controlled calibration chamber, enabling it to meet higher standards. With a standard I2C interface, system integration is simplified and efficient. Its compact size and low power consumption make it an ideal choice for a wide range of applications, including demanding environments.
Module Features
- Fully Calibrated;
- Digital output, I2C interface;
- Excellent long-term stability;
- Fast response;
- Strong anti-interference capability;
- SMD package suitable for reflow soldering.
Product Parameters
Power supply voltage: DC 2 – 5.5 V;
Temperature measurement range: -40 ~ +120 °C;
Temperature measurement accuracy: ±0.3 °C;
Humidity measurement range: 0 ~ 100 %RH;
Humidity measurement accuracy: ±2 %RH (at 25 °C);
Temperature resolution: 0.01 °C;
Humidity resolution: 0.024 %RH;
Output signal: I2C.
Pin Function
| Pins | Name | Description |
|---|---|---|
| 1 | VCC | Power supply voltage |
| 2 | SDA | Serial data, bidirectional port |
| 3 | GND | Ground |
| 4 | SCL | Serial data, bidirectional port |
Power pins (VDD, GND)
The AHT21B operates within a supply voltage range of 2.0 V to 5.5 V, with 3.3 V recommended as the optimal voltage. Additionally, a 100 nF decoupling capacitor must be connected between VCC and GND to serve as a filter.
Serial Clock (SCL)
SCL (Serial Clock) is used to synchronize communication between the microcontroller and the AHT21B. Since the interface incorporates fully static logic, there is no minimum frequency requirement.
Serial Data (SDA)
The SDA pin is used for data input and output of the sensor. When sending commands to the sensor, SDA is valid at the rising edge of the serial clock (SCL) and must remain stable while SCL is high. The SDA value may be changed after the falling edge of SCL. To ensure communication integrity, the valid period of SDA should be extended by T<sub>SU</sub> before the rising edge of SCL and by T<sub>H</sub> after the falling edge. When reading data from the sensor, SDA becomes valid after SCL goes low (T<sub>V</sub>) and remains valid until the next falling edge of SCL.
Relative Information
Application
HVAC, dehumidifiers, test and measurement equipment, consumer goods, automotive, automation control, data loggers, weather stations, home appliances, temperature and humidity regulation, medical devices, and other related temperature and humidity control applications.
Shipping Cost
We only ship to the United States. Shipping costs are calculated based on the total order amount.
Shipping Method And Delivery Time
All orders will be processed and shipped within 72 hours of placing the order (excluding weekends and holidays). They will ship from Shenzhen, China, primarily via 4PX logistics. Depending on the destination and logistics conditions, other carriers such as DHL, FedEx, UPS, USPS, etc., may also handle the delivery. Estimated shipping time is 7-12 business days, with actual delivery occurring in 10-17 business days, depending on logistics conditions.
Payment:
We accept Visa, Master card, Maestro, American Express, JCB, Dinner's Club, Discover, Paypal, Apple Pay, Google Pay .
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