Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	MAX44009 (Light) & BME280 (Temp/Humidity)
Communication Interface	UART Serial / TTL
Operating Voltage	3.3V - 5V DC
Light Measurement Range	0.045 to 188,000 Lux
Temperature Range	-40°C to +85°C
Humidity Range	0% to 100% RH
Baud Rate	9600 bps (Default)
PCB Dimensions	24mm x 18mm x 4mm
Mounting Hole Diameter	3mm
Application	Arduino, Raspberry Pi, IoT Projects

6 reviews

Anonymous

Mar 23, 2026

Rating: 5/5

Perfect for my weather station project

This module works flawlessly with my Arduino setup. The serial output is clean and easy to parse. Both the light sensor and the BME280 provide accurate readings compared to my calibrated instruments.

Anonymous

Mar 20, 2026

Rating: 5/5

High precision as advertised

I needed a compact solution for monitoring indoor conditions and ambient light. The MAX44009 handles bright sunlight without saturating, which was a problem with my previous LDR setup.

Anonymous

Mar 19, 2026

Rating: 5/5

Excellent beginner sensor module

As someone new to electronics, I found this very easy to use. The community support for these chips is huge, so finding code examples was simple. Works great out of the box.

Anonymous

Mar 17, 2026

Rating: 5/5

Easy integration

Plug and play with standard UART libraries. The data stream is consistent, and the humidity readings stabilize quickly after power-on. Highly recommended for prototyping.

Anonymous

Mar 15, 2026

Rating: 4/5

Solid performance for plant monitoring

Using this to automate my greenhouse lights and fans. The temperature and humidity accuracy is spot on. Would love if it came with header pins pre-soldered, but that's a minor issue.

Anonymous

Mar 14, 2026

Rating: 4/5

Great value, minor wiring confusion

The sensors are high quality and respond quickly. I deducted one star because the pinout diagram on the back was slightly faint, but once wired correctly, it performs excellently.

5 FAQ

Q: How do I calibrate the humidity sensor if it reads high?

A: The BME280 is factory calibrated. If readings seem off, ensure the sensor has been powered on for at least 5 minutes to stabilize. Persistent offsets may require software correction in your code based on a reference meter.

Q: Is the enclosure waterproof for outdoor use?

A: No, the PCB is not waterproof and does not come with an enclosure. For outdoor applications, you must house it in a suitable weatherproof case while ensuring the sensors have air exposure.

Q: What is the default baud rate for the serial output?

A: The factory default baud rate is 9600 bps. You can change this via software commands if your project requires a different speed.

Q: Can I power this directly from a 5V USB source?

A: Yes, the module includes an onboard voltage regulator and accepts input voltages between 3.3V and 5V, making it safe to connect directly to a 5V USB power supply.

Q: Does this module support I2C communication or only Serial?

A: This specific GY-39 model is configured for UART Serial communication by default. While the individual chips support I2C, the onboard circuitry routes them to the TX/RX pins for serial output.

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