A
Anonymous
Apr 11, 2026
Rating: 5/5
Fast I2C Response
As advertised, the data update rate is quick. Perfect for my weather station project.
Description
AHT21 Digital Temperature and Humidity Sensor Module - 22 Years of Component Expertise
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Communication Interface | I²C |
| Supply Voltage | 2.4V to 5.5V |
| Temperature Range | -40°C to +85°C |
| Humidity Range | 0% to 100% RH |
| Temperature Accuracy | ±0.3°C |
| Humidity Accuracy | ±2% RH |
| Package Type | SMD Module with Header Pins |
| Response Time | < 5 Seconds |
| Operating Current | 0.5mA (Measurement Mode) |
| PCB Dimensions | 15mm x 15mm |
5 reviews
A
Anonymous
Mar 12, 2026
Rating: 5/5
Great for Arduino Projects
Works flawlessly with the standard library. Readings are stable and consistent across multiple tests.
A
Anonymous
Feb 13, 2026
Rating: 5/5
Reliable Sensor
Been running for a week straight without drift. Highly recommend for indoor monitoring.
A
Anonymous
Jan 28, 2026
Rating: 4/5
Good Module
Works well but pins are a bit close together for breadboarding without an adapter. Otherwise solid.
A
Anonymous
Jan 19, 2026
Rating: 5/5
Accurate Readings
Compared it to a calibrated meter and it was very close. Good value for the price point.
5 FAQ
Q: Do you provide an Arduino library?
A: Yes, it is compatible with standard AHTxx libraries available online.
Q: Is this 5V tolerant?
A: Yes, it operates between 2.4V and 5.5V safely.
Q: Does it need calibration?
A: It comes factory calibrated, but you can recalibrate if needed via commands.
Q: What is the I2C address?
A: The default 7-bit I²C address is 0x38.
Q: Can I use this outdoors?
A: The sensor itself is not waterproof. Please house it in a protective enclosure.
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