This project presentation summarizes a Wi-Fi enabled AC light dimmer circuit that can control the brightness of lights from a mobile phone or PC using an ESP8266 Wi-Fi module connected to an Arduino board. The circuit uses common components like resistors, an optocoupler, zero-crossing detector, TRIAC, and bulb. The Arduino code controls the brightness level through PWM output to the TRIAC based on analog input from the ESP8266. The ESP8266 code connects to Adafruit IO to receive brightness values and control the Arduino output accordingly over Wi-Fi.

1. PROJECT PRESENTATION
ON
Wi-Fi AC LIGHT DIMMER
SUBMITTED BY:-
ARIJIT CHAKRABORTY
ITM UNIVERSITY, GWALIOR
ON15KS00375

2. CONTENTS :-
• WHAT IS Wi-Fi AC LIGHT DIMMER
• COMPONENTS REQUIRED
• COMPONENTS BRIEF DETAILS
• CIRCUIT DIAGRAM
• CODE REQUIRED

3. WHAT IS Wi-Fi AC LIGHT DIMMER ?
• AC LIGHT DIMMER is used to control the brightness of the light
according to our requirement. This light dimmer circuit is used to
control the voltage which gets to the light.
• Using Wi-Fi module we can control the brightness of light form our
mobile phones or PC from anywhere with the help of internet.

4. COMPONENTS REQUIRED :-
• 2 * 68k resistor
• 2 * 330E resistor
• 1 * 2.2k resistor
• 1 * MOC 3052 (Optocoupler)
• 1 * LTV814 (Zero Crossing Detector)
• 1 * BTB808 600BW (TRIAC)
• 1 * Arduino UNO R3
• ESP8266 module
• PCB
• Screw Terminals
• Wires
• Bulb
• Soldering Kit

5. COMPONENTS BRIEF DETAILS :-
• Resistor :-
A resistor is an electrical component that limits or regulates the flow of electrical
current in an electronic circuit.
• MOC 3052 :-
A Optocoupler is generally use to separate AC (High voltage) and DC (Low voltage)
• LTV 814 :-
A zero crossing detector or ZCD is a one type of voltage comparator, used to detect a
sine waveform transition from positive and negative, that coincides when the i/p
crosses the zero voltage condition.

6. COMPONENTS BRIEF DETAILS :-
• BTB808 600BW :-
The TRIAC is a three terminal semiconductor device for controlling current.
• Arduino UNO R3:-
Arduino consists of both a physical programmable circuit board (often referred to as
a microcontroller) and a piece of software, or IDE (Integrated Development
Environment) that runs on your computer, used to write and upload computer code to
the physical board.
• ESP 8266:-
The ESP8266 is a low-cost Wi-Fi microchip with full TCP/IP stack and microcontroller
capability.

7. CIRCUIT DIAGRAM :-
Arduino Side connections
Arduino
2.2k

8. CODE REQUIRED :-
ARDUINO CODE esp8266 CODE
#include<TimerOne.h>
unsigned char channel_1=9;
unsigned char CH1;
unsigned char clock_tick;
void setup() {
pinMode (channel_1,OUTPUT);
attachInterrupt (0,zero_cross,RISING);
Timer1.initialize(100);
Timer1.attachInterrupt(dimmer);
}
void dimmer(){
clock_tick ++;
if(CH1==clock_tick){
digitalWrite(channel_1,HIGH);
delayMicroseconds(5);
digitalWrite(channel_1,LOW);
}}
void zero_cross(){
clock_tick=0;}
void loop() {
int i=analogRead(Ao);
int B=map(i,0,100,100,0)
B=CH1;}}
//ANALOG OUT code
#include "config.h"
Serial.print("Connecting to Adafruit
IO");
io.connect();
analog->onMessage(handleMessage);
while(io.status() < AIO_CONNECTED) {
Serial.print(".");
delay(500);
}
Serial.println();
Serial.println(io.statusText());
analog->get();
}
void loop() {
io.run();
}
void handleMessage(AdafruitIO_Data
*data) {
int reading = data->toInt();
Serial.print("received <- ");
Serial.println(reading);
analogWrite(LED_PIN, reading);
}
//config.h code
#define IO_USERNAME "arijit01"
#define IO_KEY
"bf44877c22d7440fa38e99a57ebb9107"
#define WIFI_SSID "vivo 1603"
#define WIFI_PASS "itm12345"
#include "AdafruitIO_WiFi.h"
AdafruitIO_WiFi io(IO_USERNAME,
IO_KEY, WIFI_SSID, WIFI_PASS);