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Product Descriptions

The download material link for GY sensor website can be used on ESPHOME:

https://www.gysensor.cn/gy39-esphome/

Download online storage data (please copy to browser):

Link: https://pan.baidu.com/s/1TaH9yoAPdPIy9tiSs3sSag Extract code: eei3

If you do not have a USB to TTL module, it is recommended to purchase this module for computer testing:

https://item.taobao.com/item.htm?spm=a1z10.3 -C-s.w1017-23276336037.15.6baa68d2F3kBEj&id=588451902702&

GY-39 integrated module for light intensity, temperature, humidity, and atmospheric pressure sensors, with direct serial output

1. Various data can be read from the MCU on the module, and after calculation, the MCU can directly output the calculated practical data, supporting serial port/i2c

2. It is possible to connect an Android phone or a UTB to TTL module to a computer through a Bluetooth module, and the computer software can save data analysis

Name: 4-in-1 Meteorological Station Module (Light Intensity+Temperature and Humidity+Atmospheric Pressure Module)

Model: GY-39

Power supply: 3-5 volts

Module size: 24.3 * 26.7mm

Communication method: MCU IC/MCU_ serial port/sensor chip IIC bus

Product Technical Description

GY-39 is a low-cost sensor module for air pressure, temperature and humidity, and light intensity. Working voltage of 3-5 volts, low power 

consumption, and convenient installation. Its working principle is that the MCU collects various sensor data, processes it uniformly, and directly 

outputs the calculated results. This module has two ways to read data, namely serial UART (TTL level) or IIC (2-wire). The baud rates of the serial 

port are 9600bps and 115200bps, and can be configured in two ways: continuous, inquiry output, and power-off to save settings. It can adapt 

to different working environments and can be connected to microcontrollers and computers. In addition, a separate sensor chip working mode 

can be set. As a simple sensor module, the MCU does not participate in data processing work. Provide communication programs for Arduino, 

5L, and STM32 microcontrollers, without providing schematic diagrams or internal microcontroller source code. This GY39 module also comes 

with an Android mobile app to view data, and supports wif local area network connection, allowing both the phone and computer to display 

data simultaneously.

USB to TTL connection:

ARDUNO PRO iic connection：

ARDUNO PRO MINI serial connection：

When the module is connected to a computer separately, a USB to TTL module is required. When the module is connected to a mobile phone separately, a Bluetooth module is required:

Android mobile software displays:

With upper computer software:

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