ALS-PT19 UV Light 2.5V-5.5V Dynamic Range Analog Light Sensor Module

ALS-PT19 UV Light 2.5V-5.5V Dynamic Range Analog Light Sensor Module provides a highly accurate and reliable solution for detecting ambient light levels, with a spectral response that closely mimics the human eye. This module utilizes the ALS-PT19 phototransistor to convert light intensity into a linear analog voltage signal, allowing for seamless integration with microcontrollers like Arduino, ESP32, and STM32. Furthermore, its wide supply voltage range of 2.5V to 5.5V ensures compatibility with both low-power and standard logic systems. Consequently, engineers can implement precise brightness control or UV index monitoring without complex digital protocols. Therefore, you should choose this dynamic range sensor for any project requiring cost-effective yet high-performance optical sensing.

Key Features:

• Human Eye Spectral Response: The sensor features a peak sensitivity that matches the human eye’s perception, making it ideal for ambient light adjustments.
• Linear Analog Output: It generates a voltage output that scales linearly with light intensity, which simplifies the ADC conversion and calibration process.
• Wide Dynamic Range: The module accurately detects a broad spectrum of light levels, from dim indoor environments to bright outdoor sunlight.
• Low Power Consumption: It draws minimal current during operation, ensuring long battery life in portable or remote monitoring devices.
• UV Sensitivity: The phototransistor coating allows for effective detection of UV and visible light components within its specified spectral range.

Technical Specifications:

• Operating Voltage: 2.5 V to 5.5 V DC
• Output Type: Analog Voltage
• Peak Sensitivity Wavelength: ≈ 630 nm
• Spectral Range: 390 nm to 700 nm
• Operating Temperature: −40°C to +85°C
• Max Current Draw: ≈ 1 mA

Mechanical Specifications:

• Sensor IC: ALS-PT19-315C/L177/TR8
• PCB Material: Standard FR-4 Glass Epoxy
• Mounting Type: Through-hole headers (2.54 mm pitch)
• Coating: Clear water-resistant epoxy for optical clarity.

Dimensions:

• Module Length: ≈ 15.0 mm
• Module Width: ≈ 12.0 mm
• Total Height: ≈ 3.0 mm (excluding headers)
• Weight: ≈ 1.2 g

Pinout and Wiring:

• VCC: Connect to the positive power supply (2.5 V − 5.5 V).
• GND: Connect to the system ground.
• OUT: Connect to the Analog-to-Digital Converter (ADC) input pin of your microcontroller.
• Wiring Note: However, you must ensure a stable VCC supply to prevent fluctuations in the analog output voltage readings.

Datasheet Reference:

• Download Everlight ALS-PT19 Datasheet

Commonly Used in:

• Smart Device Displays: Controlling the backlight brightness of LCD and OLED screens based on room lighting.
• Automotive Electronics: Activating headlights automatically when ambient light levels drop.
• IoT Weather Stations: Measuring daylight duration and intensity for environmental data logging.

Applications:

• Energy Management: Automating indoor lighting systems to save power during peak daylight hours.
• Photography Equipment: Serving as a low-cost light meter for exposure calculation in DIY camera projects.
• Agriculture: Monitoring light exposure in greenhouses to optimize plant growth cycles.

Equivalent Models:

• TEMT6000: A very similar analog ambient light sensor that also offers a human-eye-like response.
• BH1750: A digital alternative that uses I2C communication; nevertheless, the ALS-PT19 is often preferred for its simplicity.
• APDS-9002: A comparable analog photodiode sensor suitable for low-voltage applications.

Package Includes:

• 1 x ALS-PT19 UV Light 2.5V-5.5V Dynamic Range Analog Light Sensor Module