AUTOMATIC RAIN

SENSINGWINDSHIEL

DWIPERANKITA SINGH

3RD YEAR

INTRODUCTIONThe Rain Tracker automotive rain

sensor, senses rain or snow hitting the windshield, and automatically runs the wipers at the right speed.

we don't have to take our hands off the wheel, or constantly adjust the speed of the wipers as road conditions change.

cont…..

A rain sensor or rain switch is a switching device activated by rainfall

In this the sensor projects infrared light into the windshield at a 45-degree angle

If the glass is dry, than most of this light is reflected back into the sensor by the front of the windshield.

If water droplets are on the glass, than it reflect the light in different direction…the wetter the glass, the less light makes it back into the sensor.

cont….

The electronics and software in the sensor turn on the wipers when the amount of light reflected onto the sensor.

software sets the speed of the wipers based on how fast the moisture builds up between wipes. It can operate the wipers at any speed.

Requirements

A BATTERY

AND SENSOR

CONTROL UNIT

High Level System Diagram

DISCRIPTION In this battery supplies the

power to the sensor

Then the wiper motor is automatically on during the time of rainfall

This sensor is fixed in the vehicle glass

Cont….

It senses the rainfall and giving control signal to the control unit

The control unit activate the wiper automatically

The rain sensor works on the principle of using water for completing its circuit

So when rain falls on it it’s circuit gets completed.

NE555 IC

Circuit diagram

WORKING The circuit presented here is not

using the optical technology It is built around the famous NE555

timer IC that is working as a monostable multivibrator here.

The circuit is using a handmade sensor to detect raindrops.

The sensor can be made by attaching 2 wires of 0.5 inch.

  Cont….

 When two wire in the hand made sensor will detect raindrops then the output of the NE555 IC at the output pin 3 will goes high

activates the relay for a set time period and after that time period is over the relay will switch off again.

The activation time period of the relay is few seconds but it can be increased by increasing the value of the capacitor Cx.

ObjectiveDetectintensity of rainfallDetect

rainfall on windshield

Improve safety by decreasing driver

distraction

Automatically activate windshield wipers once rainfall is detected

ApplicationsRain sensing wipers are

great convenience feature in a luxury car

more useful in marine

applications. 

It is use in aircraft

fit in existing

housing area

ADVANTAGE

Sensor cost is low

High accuracy

Automatic Windshield Wipers

Automatic Braking

Hands-Free Calling

Less power consumption

Automotive Safety and Convenience

Additional cost is

required in case optical

sensor is usedThis system is applied in the case of

water falling on the glass

only

DISADVANTAGE

ANY QUESTION