Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | AHT20/AHT30 |
| Interface Type | Serial TTL (UART) |
| Operating Voltage | 2.4V - 5.5V DC |
| Temperature Range | -40°C to +85°C |
| Humidity Range | 0% - 100% RH |
| Temperature Accuracy | ±0.3°C @ 25°C |
| Humidity Accuracy | ±2% RH @ 25°C |
| Response Time | < 8 seconds (63% step change) |
| Package Type | SMD Module with Pin Header |
| Application | Industrial Monitoring, HVAC, Smart Home |
Anonymous
Mar 29, 2026
Rating: 5/5
Easy to parse data strings
The output format is straightforward ASCII/Hex over serial. Writing a parser in Python took less than 10 minutes. Excellent consistency between multiple units tested.
Anonymous
Mar 14, 2026
Rating: 4/5
Good sensor, needs basic electronics knowledge
Works as described, but you need to know how to handle TTL logic levels. If you are used to I2C, just remember this uses RX/TX lines. Once configured, it's very accurate.
Anonymous
Mar 06, 2026
Rating: 5/5
Perfect for industrial prototyping
The serial interface makes integration with our existing PLC systems incredibly easy. Data is stable and matches our calibrated reference instruments within the stated tolerance.
Anonymous
Mar 03, 2026
Rating: 4/5
Great value, clear documentation
Bought this for a greenhouse monitoring project. The datasheet provided clear command sets for the UART communication. Only minor issue was the pin spacing required a slight adapter for my breadboard.
Anonymous
Mar 03, 2026
Rating: 5/5
Robust build quality
Using these in a dusty workshop environment inside an enclosure. They have been running 24/7 for three months without drift or failure. Highly recommended for industrial grade needs.
Anonymous
Mar 01, 2026
Rating: 5/5
Reliable and fast shipping
We ordered ten units for server room monitoring. All units arrived well-packaged and functioned immediately out of the box. The humidity readings are very responsive to changes.
Q: What is the baud rate default setting for this sensor?
A: The default baud rate is typically 9600 bps, but it can be configured via command set to 115200, 19200, or other standard rates depending on your firmware requirements.
Q: Can this be powered directly by a 3.3V Raspberry Pi GPIO?
A: Yes, the operating voltage range is 2.4V to 5.5V, so 3.3V is perfectly safe. However, ensure your logic levels match; the TX pin outputs at VCC level.
Q: Does this module support I2C communication or only Serial?
A: This specific model (AHT20/AHT30 Serial Version) supports only Serial TTL (UART) communication. If you require I2C, please look for our I2C variant in the store.
Q: Is there a protective coating on the sensing element?
A: Yes, the sensing element features a polymer protective layer that offers good resistance against dust and mild chemical vapors, suitable for most industrial environments.
Q: Do you provide a sample code library for Arduino?
A: We do not host libraries directly, but the communication protocol is standard UART. Many community-driven libraries for AHT20/AHT30 exist on GitHub that support serial implementations.
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