Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	CJMCU-GUVA-S12SD
Sensor Type	UV-A (320-400nm)
Operating Voltage	3.3V - 5.0V DC
Output Signal	Analog Voltage
Sensitivity Range	0 - 15 mW/cm²
Response Time	< 1 Second
Interface	Standard 3-Pin Header
PCB Dimensions	25mm x 15mm
Application	Sunlight Intensity Monitoring
Compatibility	Arduino, Raspberry Pi, ESP32

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Perfect for my weather station project

This sensor works flawlessly with my Arduino setup. The analog output is stable and correlates well with actual sunlight conditions. Great value for the price.

Anonymous

Mar 25, 2026

Rating: 5/5

Great for university projects

Bought this for a final year environmental monitoring project. Data consistency is excellent, and it survived outdoor testing without issues.

Anonymous

Mar 11, 2026

Rating: 5/5

Accurate UV detection

Compared readings with a professional handheld meter, and the correlation was surprisingly close. Excellent module for hobbyists interested in solar energy.

Anonymous

Mar 10, 2026

Rating: 5/5

Reliable and compact

Small form factor makes it easy to mount on my solar tracking robot. Reads changes in cloud cover instantly. Highly recommended for DIY electronics.

Anonymous

Mar 10, 2026

Rating: 4/5

Good sensitivity, easy to integrate

I used this to monitor UV levels in my small greenhouse. It was very easy to wire up. The only reason for 4 stars is that the documentation could be slightly more detailed regarding calibration.

Anonymous

Mar 08, 2026

Rating: 4/5

Solid performance

We bought ten of these for our workshop. Most worked perfectly out of the box. One had a noisy signal, but swapping it resolved the issue immediately.

5 FAQ

Q: How do I calibrate this sensor for accurate readings?

A: Calibration typically involves comparing the sensor's output against a known reference UV meter under controlled sunlight conditions and creating a linear regression equation in your code.

Q: Does this module require any external libraries to work with Arduino?

A: No external libraries are strictly required. You can read the analog value using the standard analogRead() function. However, you may need to write your own conversion formula to map voltage to UV index.

Q: What is the maximum voltage I can supply to the VCC pin?

A: The module operates safely between 3.3V and 5.0V. We recommend not exceeding 5.0V to prevent damage to the onboard components.

Q: Is the output digital or analog?

A: The output is analog. The voltage level on the OUT pin varies proportionally with the detected UV intensity.

Q: Can this sensor detect UV-B rays as well?

A: This specific model (GUVA-S12SD) is primarily optimized for the UV-A spectrum (320-400nm). It is not designed for accurate UV-B measurement.

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