#arduinoprojects

Build a compact multi-function IR remote system using Arduino Nano, a TSOP38238 IR receiver module, and an IR transmitter LED. This project combines IR signal decoding and IR signal transmission into a single embedded platform. The first Arduino setup captures infrared remote control signals and displays complete NEC protocol information including hexadecimal raw code, protocol type, address, and command values on the Serial Monitor. The second setup works as a programmable IR remote transmitter capable of controlling RGB LED strips and wireless motor functions using only three push buttons.

This project demonstrates real-world infrared communication by capturing, decoding, storing, and retransmitting IR signals for wireless control applications. Perfect for learning embedded systems, Arduino programming, EEPROM storage, and NEC protocol handling. 🔧

Components Required

Arduino Nano

IR LED

TSOP38238 IR Receiver

82Ω Resistor

Push Buttons

Breadboard

Connecting wires

Read the complete tutorial 👇 DIY Arduino IR Remote Controller Tutorial

DS2484 I2C to 1-Wire converter

In theory, there's a lot of 1-Wire devices out there, but in reality almost everyone uses 1-Wire for DS18b20 temperature sensors. the long wire lengths and ease of 'chaining' by sharing a single bus wire makes it perfectly fine for this purpose. you can bitbang 1Wire on most microcontrollers, and some SBCs like Raspberry Pi have kernel module support. (https://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing) But there might be chips without the 1-Wire capability, or maybe you want to use 1-Wire devices on your desktop computer or other SBC with I2C but no 1W.

Control your PC lighting dynamically and extend on-screen visuals into your room with this immersive RGB setup 🌈 This project uses an Arduino Nano + WS2812B LED strip with an improved Adalight protocol for smooth, real-time color syncing.

What you need: • Arduino Nano • WS2812B LED Strip • Breadboard • JST SM 3 Pin Connector (Male) • Connecting Wires

How it works: Your PC captures screen colors and sends RGB data via serial communication.

The Arduino: • Detects “Ada” header (Adalight protocol) • Validates data using checksum • Updates LEDs instantly

Result → ⚡ Smooth, flicker-free, real-time lighting synced with your screen

Why this setup is powerful? • Ultra-low latency response • Stable output with checksum validation • Smooth transitions during fast scenes • Perfect for immersive setups

Applications: • Gaming setups 🎮 • Movie & streaming ambience 🎬 • Smart desk aesthetics 💡 • DIY PC customization

🎯 Full project guide, code & wiring available. [Click Here]

The project consists of a laser module that continuously emits a beam aimed at a laser receiver sensor. When an object (such as a person) obstructs the laser, the receiver detects the interruption and triggers an alarm via a buzzer. This system is ideal for securing doorways, hallways, or any restricted area.

COMPONENTS REQUIRED

Arduino Uno 

Laser LED Module

Laser Receiver Sensor Module

Buzzer

Jumper wires

Breadboard

Circuit Diagram

CODE

#define LASER_PIN 7  

#define RECEIVER_PIN 8  

#define BUZZER_PIN 9  

void setup() {

  pinMode(LASER_PIN, OUTPUT);

  pinMode(RECEIVER_PIN, INPUT);

  pinMode(BUZZER_PIN, OUTPUT);

  digitalWrite(LASER_PIN, HIGH); // Laser ON

  Serial.begin(9600);

}

void loop() {

  int status = digitalRead(RECEIVER_PIN);

  if (status == 1) {  // If laser beam is blocked

    Serial.println("⚠️ Intruder Detected!");

    digitalWrite(BUZZER_PIN, HIGH);  

  } else {

    Serial.println("✅ Area Secure");

    digitalWrite(BUZZER_PIN, LOW);  

  }

  delay(500);

}

In this project, we're interfacing the KY-031 Knock Sensor with an Arduino Nano, displaying the knock count on a 16x2 LCD with I2C, and triggering an LED for visual feedback.

🔧 What You’ll Need: ✔️ Arduino Nano ✔️ KY-031 Knock Sensor Module ✔️ 16x2 LCD with I2C Interface ✔️ LED ✔️ Jumper Wires & Breadboard

💡 How It Works: The knock sensor detects vibrations, sending a signal to the Arduino. The microcontroller then updates the LCD and blinks an LED to confirm the knock was detected. Simple but effective!

🔥 Cool Applications: 🎶 DIY Drum Pad 🚪 Secret Knock Lock 🔊 Sound-Activated Projects

Check out the full tutorial and code in the tutorial!