Light-sensitive Night Light and Arduino

This time it is a simple Arduno practical small project, "Photosensitive Night Light". This "night light" is simulated using a photoresistor sensor and an RGB LED light. It automatically turns on the light when it reaches a certain level of darkness, and turns off the light when it is very bright, which is both convenient and energy-saving.

Step 1: Wiring Method

Step 2: Program Source Code

// #include <Wire.h>

int redPin= 7;

int greenPin = 6;

int bluePin = 5;

int Intensity =0;//Define Intensity variable

#define AD5 A5//Define analog port A5

void setup() {

Serial.begin(9600);

while (!Serial) {

; // wait for serial port to connect. Needed for Leonardo only

pinMode(redPin, OUTPUT);

pinMode(greenPin, OUTPUT);

pinMode(bluePin, OUTPUT);

}

}

void loop() {

//The darker the light, the larger the value; vice versa, the smaller it is.

Intensity = analogRead(AD5); //Read the value of analog port AD5 and store it in the Intensity variable

Serial.print("Intensity = "); //Serial port output "Intensity = "

Serial.println(Intensity); //The serial port outputs the value of the Intensity variable and breaks the line

delay(500); //Delay 500ms

if(Intensity>600){

setColor(0, 0, 255); // Blue Color

delay(5);

//When it is greater than 600, it reaches a certain degree of darkness and the light is turned on

}

else {

setColor(0, 0, 0); // Black Color

delay(1000);

//Otherwise, turn off the light

}

}

void setColor(int redValue, int greenValue, int blueValue) {

analogWrite(redPin, redValue);

analogWrite(greenPin, greenValue);

analogWrite(bluePin, blueValue);

}

Step 3: Test Data

Explain the changing pattern of Intensity. The darker the light, the larger the value; the brighter the light, the smaller the value.

So here I set the light to be on when the light is greater than 600; otherwise, the light is off.

Step 4: Running Result