The Automatic Rain Sensing Car Wiper system is designed to improve driving safety by automatically activating the windshield wiper when rain is detected. In this project, a rain sensor is used to sense the presence of water droplets on the windshield surface. The sensor output is given to a PIC microcontroller, which processes the signal and controls the operation of the wiper through a servo motor. When rainwater falls on the rain sensor, it detects the moisture and sends a signal to the microcontroller. The PIC microcontroller then activates the servo motor, which moves the wiper to clear the windshield. When there is no rain detected, the wiper remains in the OFF position. A crystal oscillator is used to provide a stable clock signal to the microcontroller for proper timing operations. The system is powered by a regulated power supply, and LED indicators are used to show the operational status of the system. A reset circuit is included to ensure reliable system startup. This system eliminates the need for manual switching of the wiper during rainfall, thereby reducing driver distraction and improving road safety. The proposed design is simple, cost-effective, and suitable for basic automatic rain detection applications in automobiles.      

Objectives:

• To detect rain using a rain sensor.
• To process the sensor signal using a PIC microcontroller.
• To automatically control the wiper using a servo motor.
• To reduce driver distraction during rainfall.
• To improve vehicle safety and visibility.

      The main blocks of this project are:

1. Regulated Power Supply.
2. PIC Microcontroller.
3. Rain sensor.
4. Servo motor.
5. Reset Button.
6. Crystal oscillator.
7. LED Indicators.

      Software’s used:

• PIC-C compiler for Embedded C programming.
• PIC kit 2 programmer for dumping code into Micro controller.
• Express SCH for Circuit design.

        Block Diagram:

         

video: