Day 2R-tist

INTRODUCTION OF SENSOR

WHAT IS SENSOR???

RGB LED

RGB

RED

GREEN

BLUE

D6

D3D5

Led pin configuration

How to identify IR Transister

See from top to both Led . You will see black spot on one led. On another one you will see grey spot. The led consisting of black spot is the

iR receiver (ir transister). Another one is ir emmiter. If you see only white spot then it is

normal led.

Circuit diagram or coulor detector sensor

Working process of ir sensor Ir sensor work on property of ir light that

ir light absorbed by black surface and totally reflected by white surface.

Ir led emit ir light which is reflected by surface is absorbed by ir transistor(ir receiver).

Ir receiver work on property that when light fall on an transister on his base emitter resion than its CE current increases due to emition of electron.

The ir receiver work on reverse biased.

LDR CONCEPT

Ldr work on the principle of that when light on the metal its resistance decreases.

Pin diagram of lm 324

Today’s program…..

Q-:Write a program to show 255x255x255 colour on RGB led…………?Q-: write a program to blink led using ir sensor if sensor value is 1 then it glow although it in dark …

Home work………….

Write a Program on variation of intensity of RGB using LDR sensor.

Program on variation of intensity of RGB using LDR sensor.

PROGRAM OF VARIATION RGB USING LDR

int sec1=3; int sec2=5; int sec3=6; int temp=A3; int sem;

void setup() { pinMode(3, OUTPUT); pinMode(5, OUTPUT); pinMode(6, OUTPUT); }

void loop() { sem` 1 21` =

analogRead(temp); analogWrite(3,sem); analogWrite(5,sem); analogWrite(6,sem); }

Any question…………..