GY-39 MAX44009 BME280 Sensor Module Temperature Humidity Barometric Pressure Light Intensity Detection I2C For Arduino Weather Station

GY-39 MAX44009 BME280 Multi-parameter Sensor Module 📌 Product Overview The GY-39 is a low-cost, low-power multi-parameter sensor module for detecting air pressure, temperature, humidity, and light intensity. Its working principle is that the onboard MCU collects data from various sensors, processes it centrally, and directly outputs the calculated results. This module supports two data reading methods: UART serial (TTL level) and I2C (2-wire). It provides continuous and query output modes, can retain settings during power-off, and is compatible with microcontrollers and computers under different working environments. Communication programs for 51 and STM32 microcontrollers are provided. Schematics and internal MCU source code are not included. An Android mobile app is available for data viewing, supporting WiFi local network connection, so data can be displayed simultaneously on mobile phones and computers. Note: The module can be set to operate individual sensor chips in standalone mode, acting as a simple sensor module without MCU involvement in data processing. ✨ Core Features

1. Integrated BME280 and MAX44009 chips, measuring temperature, humidity, air pressure and illuminance at the same time.
2. Dual communication interface: I2C and TTL UART, flexible for secondary development.
3. Onboard STM32F0 series MCU, built-in data calculation, directly output finished measured values.
4. Power-off memory function, the configured parameters will not be lost after power cut.
5. Optional standalone sensor mode, turn off onboard MCU for raw sensor data acquisition.
6. Low power consumption, typical operating current 5mA, working voltage 3-5V.

📋 Product Parameters

Item	Specifications
Chip Model	BME280, MAX44009, STM32F0
Operating Voltage	3~5V
Operating Current	5mA
Working Temperature	-40℃ ~ +85℃
Temperature Range	-40℃ ~ +85℃
Humidity Range	0% ~ 100% RH
Illuminance Range	0.045lux ~ 188000lux
Air Pressure Range	300~1100hPa
Response Frequency	1Hz

📐 Dimension Info

• Module size: 26.5X24X2mm, Net weight:2.1g
• With pin header: 2.6g

⚠ Important Notes

1. This module comes with 51 and STM32 demo code, but no schematic diagram or MCU source code.
2. When using standalone mode, the onboard MCU stops data processing and outputs raw sensor data.
3. Please do not exceed the 3~5V supply voltage to avoid burning the onboard chips.
4. Keep the module away from strong corrosive, high dust and high vibration environments for stable measurement.

🛠 Application Scenarios Digital lighting management, Internet of Things, smart home, weather station monitoring, illuminometer, digital barometer, altimeter, temperature & humidity meter, greenhouse climate monitoring.