This demonstration board is designed around "photoresistor (LDR)" and can complete 5 classic experiments in 5 minutes, visually demonstrating typical applications such as light resistance correspondence, threshold control, and automatic tracking. Suitable for sensor courses in high schools/universities, training for new employees in enterprises, product selection roadshows, and maker workshops. Can be used for light intensity resistance curve experiments; Light source tracking experiment. Application scenarios: High school/university courses on "Sensor Technology" and "Physics Experiments"; Pre evaluation of enterprise lighting, security, and smart home products; Science museum and youth palace science popularization exhibition; Pre competition training for electronic competitions.