OPT101 Analog Light Intensity Sensor Module

The OPT101 Analog Light Sensor Module is a precise illuminance sensor ideal for hobbyists, engineers, and electronics enthusiasts working on light-sensing, automation, and instrumentation projects. It integrates a photodiode and transimpedance amplifier directly on a single chip, eliminating common issues found in discrete sensor designs such as leakage current errors, noise pickup, and gain peaking caused by stray capacitance.

This module offers excellent linearity and low dark current, making it well-suited for accurate brightness measurement across a wide range of lighting conditions. Its output voltage increases linearly with light intensity, and the amplifier supports both single and dual power-supply operation, making it flexible for both bench setups and battery-powered projects. With a wide spectral response covering infrared to visible light, it performs reliably across diverse environments.

Common applications include light-based automation, exposure control, ambient light detection, smoke detectors, barcode scanners, and laboratory or medical instrumentation. Compatible with Arduino and other microcontrollers via simple analog input reading, this sensor is a great addition to any maker’s sensor toolkit for projects requiring dependable light intensity feedback.

Specification:

• Model : OPT101 (CJMCU-101)
• Supply Voltage : 2.7V to 36V
• Photodiode Size : 2.29mm x 2.29mm
• Feedback Resistor : Internal 1MΩ
• Responsivity : 0.45A/W (650nm)
• Bandwidth : 14KHz
• Quiescent Current : 120uA
• Operating Temperature : 0°C to 70°C