Twilight Switch With Levels

About: I like technology and travel

We intend to make a twilight switch. In this case, instead of a single LED, we will use 4 LEDs, depending on the level of light that we capture with the LDR sensor.

For the realization of this project, we used a small LDR range, in order to more easily visualize the results (in particular between 600 and 800).

These LEDs simulate, for example, lighting of parts of the house or of different devices such as heating, etc: In this case we will have:

Level 1 (lowest light): 4 LEDs on

Level 2: 3 LEDs on

Level 3: 2 LEDs on

Level 4: 1 led on

Level 5: All LEDs off, enough light.

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Step 1: Components You Will Need

Step 2: How to Connect Them

Step 3: The Arduino Code

/*

Interruptor Crepuscular con distintos niveles:

Sistema para controlar el encendido de 4 leds

en funcion de varios intervalos de intensidad luminosa

LDR pin A0

LED1 pin 12

LED2 pin 11

LED3 pin 10

LED4 pin 9

Abril 2018

Rafael Salvador Jiménez

*/

// variables constantes para los pines

const int ldrPin = A0; // establece el pin de la LDR

const int ledPin1 = 12; // establece el pin del LED1 rojo

const int ledPin2 = 11; // establece el pin del LED2 rojo

const int ledPin3 = 10; // establece el pin del LED3 rojo

const int ledPin4 = 9; // establece el pin del LED4 rojo

// variables que pueden cambiar

int ldrValue = 0; // variable para almacenar el valor de la LDR

int ldrlevel1=600; // nivel1 de cambio del valor de la LDR

int ldrlevel2=700; // nivel2 de cambio del valor de la LDR

int ldrlevel3=750; // nivel3 de cambio del valor de la LDR

int ldrlevel4=800; // nivel4 de cambio del valor de la LDR

void setup() {

// establece el LED como una salida

Serial.begin(9600);

pinMode(ledPin1, OUTPUT);

pinMode(ledPin2, OUTPUT);

pinMode(ledPin3, OUTPUT);

pinMode(ledPin4, OUTPUT);

}

void loop() {

ldrValue = analogRead(ldrPin); // lee el valor del sensor

Serial.println(ldrValue);

// si el valor es menor en cada nivel enciende los LEDs correspondientes

if (ldrValue < ldrlevel1) {

digitalWrite(ledPin4, HIGH);

}

else if (ldrValue < ldrlevel2) {

digitalWrite(ledPin4, LOW);

digitalWrite(ledPin3, HIGH);

}

else if (ldrValue < ldrlevel3) {

digitalWrite(ledPin3, LOW);

digitalWrite(ledPin2, HIGH);

}

else if (ldrValue < ldrlevel4) {

digitalWrite(ledPin2, LOW);

digitalWrite(ledPin1, HIGH);

}

// si no los apaga

else {

digitalWrite(ledPin1, LOW);

}

}

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