Li-Fi Enabled Text Communication Using Arduino

Li-Fi enables shifting data utilizing optical communication likewise visible light

Supplies

Hardware Components

Arduino UNO

LDR Sensor

Keypad 4*4

16*2 Alphanumeric LCD

I2C Interface module for LCD

5 mm LED: Red

Software Components

Arduino IDE

About Project

Li-Fi utilizes visible light as a communication medium for the release of data. A LED can serve as a light source and the photodiode serves as a transceiver that sustains light signals and sends them back.

By Checking the light pulse at the transmitter side, we can transfer unique data patterns. This phenomenon happens at much high speed and can't be seen via the human eye. Then at the receiver side, the photodiode or Light-dependent resistor (LDR) changes the data into valuable data.

Li-Fi Transmitter Using Arduino

Arduino changes the data into binary pulses which can be served to an LED source for transmission. Then this information is supplied to LED light which transmits the visible light pulses to the receiver side.

Li-Fi Receiver Module

On the receiver side, the LDR sensor sustains the visible light pulses from the transmitter side and changes them into interpretable electrical pulses, which are supplied to the control unit.

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Run a Code

//Transmitter Side: #include const byte ROW = 4; const byte COL = 4; char keyscode[ROW][COL] = { {'1', '2', '3', 'A'}, {'4', '5', '6', 'B'}, {'7', '8', '9', 'C'}, {'*', '0', '#', 'D'} }; byte rowPin[ROW] = {A5, A4, A3, A2}; byte colPin[COL] = {A1, A0, 12, 11}; Keypad customKeypad = Keypad( makeKeymap(keyscode), rowPin, colPin, ROW, COL); char keycount = 0; char code[5]; void setup() { Serial.begin(9600); pinMode(8,OUTPUT); digitalWrite(8,LOW); } void loop() { char customKey = customKeypad.getKey(); if (customKey) { Serial.println(customKey); if (customKey == '1') { digitalWrite(8,HIGH); delay(10); digitalWrite(8,LOW); } else if (customKey == '2') { digitalWrite(8,HIGH); delay(20); digitalWrite(8,LOW); } else if (customKey == '3') { digitalWrite(8,HIGH); delay(30); digitalWrite(8,LOW); } else if (customKey == '4') { digitalWrite(8,HIGH); delay(40); digitalWrite(8,LOW); } else if (customKey == '5') { digitalWrite(8,HIGH); delay(50); digitalWrite(8,LOW); } else if (customKey == '6') { digitalWrite(8,HIGH); delay(60); digitalWrite(8,LOW); } else if (customKey == '7') { digitalWrite(8,HIGH); delay(70); digitalWrite(8,LOW); } else if (customKey == '8') { digitalWrite(8,HIGH); delay(80); digitalWrite(8,LOW); } else if (customKey == '9') { digitalWrite(8,HIGH); delay(90); digitalWrite(8,LOW); } else if (customKey == '*') { digitalWrite(8,HIGH); delay(100); digitalWrite(8,LOW); } else if (customKey == '0') { digitalWrite(8,HIGH); delay(110); digitalWrite(8,LOW); } else if (customKey == '#') { digitalWrite(8,HIGH); delay(120); digitalWrite(8,LOW); } else if (customKey == 'A') { digitalWrite(8,HIGH); delay(130); digitalWrite(8,LOW); } else if (customKey == 'B') { digitalWrite(8,HIGH); delay(140); digitalWrite(8,LOW); } else if (customKey == 'C') { digitalWrite(8,HIGH); delay(150); digitalWrite(8,LOW); } else if (customKey == 'D') { digitalWrite(8,HIGH); delay(160); digitalWrite(8,LOW); } else; } } //Receiver Side: #include #include LiquidCrystal_I2C lcd(0x27, 16, 2); #include #include void setup() { pinMode(8, INPUT); Serial.begin(9600); lcd.init(); lcd.backlight(); //lcd.backlight(); lcd.setCursor(0, 0); lcd.print(" WELCOME TO "); lcd.setCursor(0, 1); lcd.print(" CIRCUIT DIGEST "); delay(2000); lcd.clear(); } void loop() { unsigned long duration = pulseIn(8, HIGH); Serial.println(duration); if (duration > 10000 && duration < 17000) { lcd.setCursor(0, 0); lcd.print("Received: 1 "); } else if (duration > 20000 && duration < 27000) { lcd.setCursor(0, 0); lcd.print("Received: 2 "); } else if (duration > 30000 && duration < 37000) { lcd.setCursor(0, 0); lcd.print("Received: 3 "); } else if (duration > 40000 && duration < 47000) { lcd.setCursor(0, 0); lcd.print("Received: 4 "); } else if (duration > 50000 && duration < 57000) { lcd.setCursor(0, 0); lcd.print("Received: 5 "); } else if (duration > 60000 && duration < 67000) { lcd.setCursor(0, 0); lcd.print("Received: 6 "); } else if (duration > 70000 && duration < 77000) { lcd.setCursor(0, 0); lcd.print("Received: 7 "); } else if (duration > 80000 && duration < 87000) { lcd.setCursor(0, 0); lcd.print("Received: 8 "); } else if (duration > 90000 && duration < 97000) { lcd.setCursor(0, 0); lcd.print("Received: 9 "); } else if (duration > 100000 && duration < 107000) { lcd.setCursor(0, 0); lcd.print("Received: * "); } else if (duration > 110000 && duration < 117000) { lcd.setCursor(0, 0); lcd.print("Received: 0 "); } else if (duration > 120000 && duration < 127000) { lcd.setCursor(0, 0); lcd.print("Received: # "); } else if (duration > 130000 && duration < 137000) { lcd.setCursor(0, 0); lcd.print("Received: A "); } else if (duration > 140000 && duration < 147000) { lcd.setCursor(0, 0); lcd.print("Received: B "); } else if (duration > 150000 && duration < 157000) { lcd.setCursor(0, 0); lcd.print("Received: C "); } else if (duration > 160000 && duration < 167000) { lcd.setCursor(0, 0); lcd.print("Received: D "); } }