Here we have 4 different projects about Power line communication using KQ-130F / KQ-330 and Arduino.
Parts list:
Arduino board
Power line communication module KQ-130F / KQ-330
FTDI (USB to TTL serial converter)
LCD 16X2 with I2C
Common mode chock
Power Supply 5V 1A
Filtering Circuit:
First Project:
This code sending "Hello" to the receiver every 2 seconds
Receiver Circuit:
Transmitter Circuit:
Watch this video for more details:
Code:
void setup() {
Serial.begin(9600); // To Computer
Serial1.begin(9600); // To KQ-130/330
}
void loop() {
// Send "Hello" to the power line
Serial1.println("Hello");
// If the module receives something from the power line, print it to the screen
while (Serial1.available()) {
Serial.write(Serial1.read());
}
delay(2000);
}
Second Project:
This code control 5 LEDs (Red, green, blue, yellow and white) using serial command.
For example to turn on the Red you have to write " RED ON " in serial monitor
To turn off the Red you have to write " RED OFF " in serial monitor
The same thing for other colors.
You can also turn on all LEDs at the same time using this command " ALL ON "
const int RED = 2;
const int GREEN = 3;
const int BLUE = 4;
const int WHITE = 5;
const int YELLOW = 6;
void setup() {
Serial.begin(9600);
Serial1.begin(9600);
pinMode(RED, OUTPUT);
pinMode(GREEN, OUTPUT);
pinMode(BLUE, OUTPUT);
pinMode(WHITE, OUTPUT);
pinMode(YELLOW, OUTPUT);
Serial.println("System Ready: Sending ALL-ON / ALL-OFF now supported.");
}
void loop() {
if (Serial1.available() > 0) {
String burst = Serial1.readStringUntil('\n');
burst.toUpperCase();
// --- MASTER COMMANDS (ALL) ---
if (burst.indexOf("ALL") != -1) {
if (burst.indexOf("ON") != -1) {
digitalWrite(RED, HIGH);
digitalWrite(GREEN, HIGH);
digitalWrite(BLUE, HIGH);
digitalWrite(WHITE, HIGH);
digitalWrite(YELLOW, HIGH);
}
else if (burst.indexOf("OFF") != -1) {
digitalWrite(RED, LOW);
digitalWrite(GREEN, LOW);
digitalWrite(BLUE, LOW);
digitalWrite(WHITE, LOW);
digitalWrite(YELLOW, LOW);
}
}
// --- INDIVIDUAL COLORS ---
// RED
if (burst.indexOf("RED") != -1) {
if (burst.indexOf("ON") != -1) digitalWrite(RED, HIGH);
else if (burst.indexOf("OFF") != -1) digitalWrite(RED, LOW);
}
// GREEN
if (burst.indexOf("GREEN") != -1) {
if (burst.indexOf("ON") != -1) digitalWrite(GREEN, HIGH);
else if (burst.indexOf("OFF") != -1) digitalWrite(GREEN, LOW);
}
// BLUE
if (burst.indexOf("BLUE") != -1) {
if (burst.indexOf("ON") != -1) digitalWrite(BLUE, HIGH);
else if (burst.indexOf("OFF") != -1) digitalWrite(BLUE, LOW);
}
// WHITE
if (burst.indexOf("WHITE") != -1) {
if (burst.indexOf("ON") != -1) digitalWrite(WHITE, HIGH);
else if (burst.indexOf("OFF") != -1) digitalWrite(WHITE, LOW);
}
// YELLOW
if (burst.indexOf("YELLOW") != -1) {
if (burst.indexOf("ON") != -1) digitalWrite(YELLOW, HIGH);
else if (burst.indexOf("OFF") != -1) digitalWrite(YELLOW, LOW);
}
// Clear buffer for the next burst
while(Serial1.available() > 0) Serial1.read();
}
}
Third Project:
This code is similar to the previous one, except i used a relay instead of white LED and connect it to 220V AC light bulb.
To turn on the light bulb you have to write " Lamp ON " in serial monitor
const int RED = 2;
const int GREEN = 3;
const int BLUE = 4;
const int LAMP = 5; // Changed from WHITE to LAMP
const int YELLOW = 6;
void setup() {
Serial.begin(9600);
Serial1.begin(9600);
pinMode(RED, OUTPUT);
pinMode(GREEN, OUTPUT);
pinMode(BLUE, OUTPUT);
pinMode(LAMP, OUTPUT);
pinMode(YELLOW, OUTPUT);
// Normal situation: All LEDs OFF, Lamp pin HIGH (OFF for active-low)
digitalWrite(RED, LOW);
digitalWrite(GREEN, LOW);
digitalWrite(BLUE, LOW);
digitalWrite(YELLOW, LOW);
digitalWrite(LAMP, HIGH); // LAMP starts HIGH (Normal/Off)
Serial.println("System Ready. Lamp is currently HIGH (OFF).");
}
void loop() {
if (Serial1.available() > 0) {
String burst = Serial1.readStringUntil('\n');
burst.toUpperCase();
// --- MASTER COMMANDS (ALL) ---
if (burst.indexOf("ALL") != -1) {
if (burst.indexOf("ON") != -1) {
digitalWrite(RED, HIGH);
digitalWrite(GREEN, HIGH);
digitalWrite(BLUE, HIGH);
digitalWrite(YELLOW, HIGH);
digitalWrite(LAMP, LOW); // Inverse: On = LOW
}
else if (burst.indexOf("OFF") != -1) {
digitalWrite(RED, LOW);
digitalWrite(GREEN, LOW);
digitalWrite(BLUE, LOW);
digitalWrite(YELLOW, LOW);
digitalWrite(LAMP, HIGH); // Inverse: Off = HIGH
}
}
// --- INDIVIDUAL CONTROL ---
// LAMP (Inverse Logic)
if (burst.indexOf("LAMP") != -1) {
if (burst.indexOf("ON") != -1) digitalWrite(LAMP, LOW);
else if (burst.indexOf("OFF") != -1) digitalWrite(LAMP, HIGH);
}
// RED
if (burst.indexOf("RED") != -1) {
if (burst.indexOf("ON") != -1) digitalWrite(RED, HIGH);
else if (burst.indexOf("OFF") != -1) digitalWrite(RED, LOW);
}
// GREEN
if (burst.indexOf("GREEN") != -1) {
if (burst.indexOf("ON") != -1) digitalWrite(GREEN, HIGH);
else if (burst.indexOf("OFF") != -1) digitalWrite(GREEN, LOW);
}
// BLUE
if (burst.indexOf("BLUE") != -1) {
if (burst.indexOf("ON") != -1) digitalWrite(BLUE, HIGH);
else if (burst.indexOf("OFF") != -1) digitalWrite(BLUE, LOW);
}
// YELLOW
if (burst.indexOf("YELLOW") != -1) {
if (burst.indexOf("ON") != -1) digitalWrite(YELLOW, HIGH);
else if (burst.indexOf("OFF") != -1) digitalWrite(YELLOW, LOW);
}
// Clear buffer
while(Serial1.available() > 0) Serial1.read();
}
}
4th project:
This is a pager so when you write a message, it appears on the 16x2 LCD.
You need to start and end your message with two brackets like this [[ Your message here ]] .
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
const int buzzerPin = 7;
String currentMsg = "";
void setup() {
Serial.begin(9600);
Serial1.begin(9600);
pinMode(buzzerPin, OUTPUT);
digitalWrite(buzzerPin, LOW);
lcd.init();
lcd.backlight();
lcd.print("Triple Beep Mode");
delay(1500);
lcd.clear();
}
void loop() {
if (Serial1.available() > 0) {
String raw = Serial1.readStringUntil('\n');
int startIdx = raw.indexOf("[[");
int endIdx = raw.indexOf("]]");
if (startIdx != -1 && endIdx != -1 && endIdx > startIdx) {
String cleanMsg = raw.substring(startIdx + 2, endIdx);
String filteredMsg = "";
for (int i = 0; i < cleanMsg.length(); i++) {
if (cleanMsg[i] >= 32 && cleanMsg[i] <= 126) {
filteredMsg += cleanMsg[i];
}
}
if (filteredMsg.length() > 0 && filteredMsg.length() <= 32) {
// Only alert if the message is new
if (filteredMsg != currentMsg) {
updateLCD(filteredMsg);
playTripleBeep();
}
}
}
}
}
void updateLCD(String msg) {
currentMsg = msg;
lcd.clear();
if (msg.length() <= 16) {
lcd.setCursor(0, 0);
lcd.print(msg);
} else {
lcd.setCursor(0, 0);
lcd.print(msg.substring(0, 16));
lcd.setCursor(0, 1);
lcd.print(msg.substring(16, 32));
}
}
// The new, less annoying notification sound
void playTripleBeep() {
for (int i = 0; i < 3; i++) {
digitalWrite(buzzerPin, HIGH);
delay(150); // Short beep
digitalWrite(buzzerPin, LOW);
delay(100); // Short silence between beeps
}
}
