A
Anonymous
Apr 08, 2026
Rating: 5/5
Great for Arduino projects
Works perfectly with my ESP32. Readings are stable and consistent.
Description
AHT21 digital temperature and humidity sensor, specializing in components for 22 years
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Communication Interface | I²C (Inter-Integrated Circuit) |
| Operating Voltage | 1.8V to 5.5V DC |
| Temperature Measurement Range | -40°C to +85°C |
| Humidity Measurement Range | 0% to 100% RH |
| Humidity Accuracy | ±2% RH (typical) |
| Temperature Accuracy | ±0.3°C (typical) |
| Response Time | < 5 seconds |
| Power Consumption | Low power sleep mode available |
| Module Size | 20mm x 15mm x 5mm |
| Microcontroller Compatibility | Arduino, ESP32, STM32, Raspberry Pi |
5 reviews
A
Anonymous
Apr 01, 2026
Rating: 5/5
Accurate and Fast
I²C communication is very reliable. No interference issues so far in my setup.
A
Anonymous
Mar 19, 2026
Rating: 5/5
Easy to use library
Found plenty of code examples online. Getting data was instant upon connection.
A
Anonymous
Mar 02, 2026
Rating: 4/5
Good value sensor
Works well though the pins are a bit close together for standard breadboards.
A
Anonymous
Jan 26, 2026
Rating: 5/5
Exactly as described
Fast shipping and the module is well soldered. Highly recommend for beginners.
5 FAQ
Q: What is the I²C address?
A: The default I²C address is typically 0x38 for this sensor module.
Q: Can I use this outdoors?
A: The module itself is not waterproof. You need to place it in a protective enclosure.
Q: Is calibration required?
A: They are factory calibrated, so no user calibration is needed before use.
Q: Is this 3.3V or 5V logic compatible?
A: It supports 1.8V to 5.5V, so both 3.3V and 5V logic levels work fine.
Q: Does it come with a library?
A: No, but it is compatible with standard AHT20 and AHT21 Arduino libraries.
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