CJMCU APDS-9930 Proximity and Ambient Light Sensor Module
Product Description
The CJMCU APDS-9930 Proximity and Ambient Light Sensor Module is a compact digital optical sensing module that combines ambient light sensing (ALS), an infrared (IR) LED, and proximity detection in a single sensor package.
It can measure surrounding light intensity and detect nearby objects without physical contact. The ambient light sensor is designed to approximate the human eye's response to visible light, making it useful for automatic display brightness adjustment and light-sensitive applications.
The proximity sensor can detect objects at distances of up to 100 mm under specified conditions, without front glass. Its high sensitivity also allows it to work behind darkened glass, making it suitable for mobile phones, displays, and embedded electronics projects.
The APDS-9930 communicates digitally with a compatible microcontroller and includes programmable interrupt thresholds for proximity and ambient light measurements. Its low-power operating modes make it suitable for battery-powered applications.
Key Features
2-in-1 Optical Sensor: Combines ambient light sensing and proximity detection.
Digital Ambient Light Sensing: Measures surrounding light intensity.
IR Proximity Detection: Detects nearby objects using an infrared LED.
Up to 100 mm Detection: Proximity detection distance under specified conditions and without front glass.
Human Eye Response: ALS approximates the photopic response of the human eye.
High Sensitivity: Supports low-light measurement down to 0.01 lux (as specified).
Up to 16-Bit Resolution: Supports high-resolution sensor measurements.
Programmable Interrupts: Upper and lower threshold settings for event detection.
Low-Power Operation: Internal state machine supports low-power operation between measurements.
Dark Glass Detection: Designed to support proximity sensing behind darkened glass.
Technical Specifications
Parameter | Specification |
Sensor IC | APDS-9930 |
Module Name | CJMCU APDS-9930 |
Sensor Type | Digital Optical Sensor |
Functions | Ambient Light Sensing and Proximity Detection |
Operating Voltage | 2.8V – 3.8V (supplier specification) |
Communication | I2C |
Ambient Light Resolution | Up to 16-bit |
Minimum Light Level | 0.01 lux (specified performance) |
Proximity Detection Range | Up to 100 mm (without front glass, under specified conditions) |
Proximity Emitter | Infrared LED |
Interrupt Function | Programmable upper and lower thresholds |
Light Response | Photopic response approximation |
Operating Modes | ALS, Proximity and low-power operation |
Module Type | Optical Sensor Breakout Board |
Applications
Automatic mobile phone screen brightness adjustment
Smartphone proximity detection
Notebook and display security systems
Automatic hands-free mode activation
Automatic menu pop-up systems
Digital camera eye sensors
Display backlight control
Object detection and presence sensing
Embedded electronics and automation projects
Arduino and microcontroller-based projects
Package Includes
1 × CJMCU APDS-9930 Proximity and Ambient Light Sensor Module
Important Notes
The module's specified operating voltage is 2.8V–3.8V. Do not assume that its breakout board supports direct 5V operation.
The APDS-9930 uses I2C communication. Check the module's pin labels and interface details before connecting it.
The maximum proximity range of 100 mm is dependent on object reflectivity, ambient light, sensor alignment, and installation conditions.
Proximity performance may change when the sensor is installed behind glass or other protective materials.
The 0.01 lux figure refers to specified low-light sensing performance; actual results depend on configuration and operating conditions.
Verify the breakout board's voltage regulation and logic-level compatibility before connecting it to an Arduino, ESP32, or other controller.
