Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Detection Range | 0-1000 µg/m³ |
| Response Time | < 1 second |
| Communication Interface | UART / PWM |
| Operating Voltage | 5.0V ± 0.2V |
| Particle Size Resolution | 0.3 µm |
| Dimensions | 48 x 38 x 12 mm |
| Working Temperature | -10°C to 60°C |
| Laser Wavelength | 650 nm |
| Fan Lifespan | > 20,000 hours |
| Data Update Frequency | 1 time/second |
Anonymous
Mar 26, 2026
Rating: 5/5
Best upgrade for my weather station
Upgraded from a basic optical sensor to this laser-based CJ3 module. The difference in data granularity is night and day. Now I can track particulate matter trends hour by hour with confidence.
Anonymous
Mar 25, 2026
Rating: 5/5
Easy to integrate
Documentation was clear enough to get started quickly. The pinout is standard and the voltage requirements are easy to meet. It started reporting PM2.5 values within seconds of powering up.
Anonymous
Mar 23, 2026
Rating: 5/5
Perfect for industrial prototyping
We used these modules for a batch of prototype air purifiers. They are robust, consistent across units, and the high precision allows us to tune our filtration algorithms effectively. Highly recommended for engineering teams.
Anonymous
Mar 23, 2026
Rating: 5/5
Incredibly fast response for DIY air quality monitors
I integrated this CJ3 sensor into my home automation system and the speed is impressive. It detects smoke from cooking almost instantly compared to my old sensor. The UART output is clean and easy to parse with an ESP32.
Anonymous
Mar 20, 2026
Rating: 4/5
Solid performance for the price
Does exactly what it says on the tin. It picks up dust changes when I vacuum or open windows. The haze detection is particularly sensitive. Took off one star because the connector cable could be a bit longer.
Anonymous
Mar 10, 2026
Rating: 4/5
Great precision, slightly noisy fan
The data accuracy seems very high when compared against a professional grade meter. My only minor complaint is that the internal fan produces a slight hum, which might be noticeable in a quiet bedroom setup. Otherwise, excellent value.
Q: What is the warm-up time required before readings are accurate?
A: While the sensor responds in under a second, we recommend a 30-second warm-up period after power-on to allow the laser and fan to stabilize for optimal precision.
Q: Can this sensor detect cigarette smoke effectively?
A: Yes, the CJ3 module is highly sensitive to fine particles generated by cigarette smoke and will register a rapid increase in PM2.5 levels upon detection.
Q: Can it operate outdoors in rainy conditions?
A: No, this sensor module is not waterproof. It must be housed in a protective enclosure with proper airflow if used in outdoor or humid environments.
Q: Is the communication protocol compatible with Arduino?
A: Absolutely. The sensor outputs data via UART (TTL level) and PWM, both of which are fully compatible with Arduino boards using standard serial libraries.
Q: Does this module come with a mounting bracket?
A: The module includes four mounting holes on the PCB for screws, but a specific external plastic bracket is not included in the standard package.
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