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GY-39 Sensor Module MAX44009 4 in 1 Sensor Module 3-5V Built-in MCU - RS1122

GY-39 Sensor Module MAX44009 4 in 1 Sensor Module 3-5V Built-in MCU - RS1122


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  • Cost-effective;
  • Built-in MCU to calculate sensor data;
  • IIC, serial communication format;
  • Unified data output
  • Working voltage: 3 ~ 5 V


  • Name: 4 in 1 weather station module(light intensity + temperature and humidity + atmospheric pressure module)
  • Model: GY-39
  • Using chip: MAX44009+BME280+MCU
  • Power supply: 3-5v
  • Module size: 24.3*26.7mm
  • Communication mode:MCU_IIC/MCU_Serial / sensor chip IIC bus


GY-39 is a low cost, air pressure, temperature and humidity, light intensity sensor module. The working voltage is 3-5V. The power consumption is small, and the installation is convenient. The working principle is that the MCU collects various sensor data, performs unified processing, and directly outputs the calculated result. This module has two ways to read data, namely serial UART (TTL level) or IIC (2 line). The baud rate of the serial port is 9600bps and 115200bps, configurable, continuous, and two output modes are requested, and the settings can be saved after power down. It can adapt to different working environments, and connect with single-chip computer and computer. The module can also set a separate sensor chip operating mode. As a separate sensor module, the MCU does not participate in data processing. Provide arduino, 51, stm32 MCU communication program, does not provide schematic and internal MCU source code. This GY39 module also gives Android mobile phone software app to view data, and supports wifi LAN connection, mobile phone and computer display data at the same time.


1. High cost performance
2. Built-in MCU to calculate sensor data
3. IIC, serial communication format
4. Unified data output
5. With the corresponding PC software


1. Digital lighting management
2. Internet of Things, smart home applications
3. Weather station monitoring
4. Digital lighting design
5. Digital barometer, altimeter
6. Thermometer
7. Greenhouse climate monitoring

Name Parameter
Temperature measurement range -40°-85°
Humidity measurement range 0%-100%
Light intensity measurement range 0.045lux-188000lux
Air pressure measurement range 300-1100hpa
Response frequency 10HZ
Working voltage 3-5V
Working current 5mA
Working temperature -40°-85°
Storage temperature -40°-125°
Size 24.3 x 26.7mm
Sensor chip ME280+MAX44009

PIN Description Parameter
Pin1 VCC Power+ (3-5V)
Pin2 CT Serial port UART_TX/IIC_SCL
Pin3 DR Serial port UART_RX/IIC_SDA
Pin4 GND Power ground
Pin5 NC Reserved, don't connect
Pin6 INT Max44009 light intensity chip interrupt S0-1 (enabled when connected to GND)
Pin7 SDA Chip data bus S0-1 (enabled when connected to GND)
Pin8 SCL Chip clock bus S0-1 (enabled when connected to GND)
PinA S0 Serial/MCU_IIC mode selection
PinB S1 Use only sensor chip selection

(1) PinA (S0) hardware selects the working mode, Pin2 (CT) and Pin3 (DR) is the GY-39 module communication interface

S0=1 (default) Serial UART mode, Pin2 is TX, Pin3 is RX, TTL level
S0=0 (when connected to GND) MCU_IIC mode, Pin2 is SCL, Pin3 is SDA

(2) PinB (S1) uses only the sensor chip ME280+MAX44009 mode to select whether the MCU participates in data processing

S1=1 (default) MCU+ chip mode, Pin7, Pin8, please do not have any connection
S1=0 (when connected to GND) Chip mode only, Pin7 is the chip SCL bus, Pin8 is the chip SDA bus

Package Included:

1 x GY-39 humidity atmospheric pressure sensor module