Problem & Solution
DIY electronics enthusiasts and IoT developers often face space constraints and messy wiring when trying to measure ambient temperature, humidity, and atmospheric pressure simultaneously. Using separate sensor modules increases overall power consumption, takes up valuable breadboard real estate, and complicates microcontroller pin management.
The AHT20+BMP280 combined module eliminates these headaches by integrating dedicated temperature/humidity sensing (AHT20) and barometric pressure sensing (BMP280) onto a single tiny breakout board. Communicating over a shared I2C bus, it allows creators to gather comprehensive atmospheric data using just two signal pins.
Priced at under $1.50, this module delivers professional-grade digital accuracy without inflating your project budget, making it an ideal core component for custom weather stations and smart home monitors.
Who Is It For?
This sensor module is designed for makers, electronics hobbyists, Arduino/ESP32 developers, and IoT engineers building compact weather monitoring units, indoor air quality sensors, or altitude-tracking telemetry systems.
It is also ideal for budget-conscious creators who need industrial-level I2C sensing precision without paying premium prices for multiple individual breakout boards.
Key Features
- Combined AHT20 & BMP280 ChipsReads temperature, humidity, and barometric pressure from a single compact board to save space.
- Standard I2C Bus InterfaceConnects seamlessly to Arduino, Raspberry Pi, and ESP32 using only two communication pins.
- Factory Calibrated Digital OutputDelivers accurate, ready-to-use readings out of the box without requiring manual calibration routines.
- Ultra-Low Power ConsumptionPreserves battery life in remote IoT environmental nodes and portable logging devices.
- High-Resolution Barometric Altitude SensingCalculates elevation changes accurately for altimeter and indoor navigation projects.
- Wide Compatibility & Library SupportIntegrates easily into custom code thanks to extensive open-source Arduino and Python library support.
Pros & Cons
Pros
- Dual-sensor design delivers full atmospheric data on a single tiny breakout board.
- Unbeatable cost-to-performance ratio under $1.50.
- Simple I2C communication saves microcontroller GPIO pins.
- High precision suitable for serious home weather stations and IoT builds.
Cons
- Requires basic soldering skills if headers need to be attached.
- I2C address sharing requires attention when connecting multiple identical modules.
FAQ
Yes, it uses a standard I2C interface compatible with Arduino, ESP32, ESP8266, and Raspberry Pi using standard open-source libraries.
The AHT20 measures relative humidity and ambient temperature, while the BMP280 measures atmospheric pressure and calculates barometric altitude.
No, both sensors come factory calibrated and provide direct digital data output over the I2C bus.
Yes, the BMP280 sensor measures barometric pressure, which software libraries can convert into precise relative altitude readings.
Final Verdict
The AHT20+BMP280 sensor module offers incredible value for anyone building micro weather stations, home automation nodes, or IoT environmental monitors. Combining high-accuracy temperature, humidity, and pressure sensing on a single inexpensive board, it stands out as one of the best bang-for-your-buck breakout modules available.