Rain Sensing Wiper / Umbrella Activator

Problem statement

Drivers may sometimes delay switching on wipers during sudden rain, affecting visibility, and people may step out without realizing it is drizzling.

Abstract

The project uses a rain sensor plate to detect raindrops and control a small wiper motor or indicator. In a car model, the rain sensor signal starts the wiper motor. In a home/hostel application, an LED or buzzer near the exit can alert people to carry an umbrella.

Components required

• Rain sensor module
• Microcontroller or simple transistor driver
• DC motor with wiper linkage (model)
• LED indicator / buzzer
• Motor driver IC (L293D or similar)
• Power supply

Block diagram

Working

The rain sensor outputs a voltage based on water drops on its surface. When rain is detected beyond a threshold, the controller activates the motor driver which runs the wiper motor at set speed. In a simplified version, it may only light an LED or buzzer to signal rainfall.

Applications

• Model of automatic car wiper system
• Rain alert at building exits
• Water leakage detection on roofs
• Introductory sensor and driver project