Light Sensing System Based on the Photoelectric Effect

Experiment to Measure Alcohol Concentration Using Oband Light Source and a Photodetector

Team Member

Xu Ruizhe, Li Zerui, Ma Shunyu, Wei Heyi

Overview

This project is designed to demonstrate the photoelectric effect by developing a smart light sensing system. The system detects ambient light intensity using a photoresistor (LDR) or a photodiode and processes the data using an Arduino or Raspberry Pi. When the light intensity crosses a predefined threshold, the system triggers a response, such as turning on an LED, activating a buzzer, or adjusting a curtain. This experiment integrates concepts from electromagnetism and the photoelectric effect into a practical and easy-to-implement application.

Objective

The main objective of this experiment is to showcase how a light sensor converts optical signals into electrical signals and how these signals can be used to automate responses. By setting a threshold for light intensity, the system demonstrates real-world applications such as automatic lighting control, security alerts, and smart home automation. Additionally, this project provides hands-on experience with microcontrollers, sensor integration, and real-time data processing.

Equipment

• Light sensors
• Arduino
• Output devices (LED, OLED, buzzer)
• 5V power supply
• Optional WiFi or relay modules for remote monitoring and automation