Simple Circuits

DIY Obstacle Avoiding Robot Using Arduino DIY Obstacle Avoiding Robot Using Arduino This project creates an intelligent obstacle avoiding robot that autonomously navigates through environments while avoiding obstacles. The robot uses an ultrasonic sensor to detect objects and a servo motor to scan the surroundings, making smart decisions about which direction to move. How the Robot Works Ultrasonic Sensor continuously measures distance to obstacles ahead When obstacle is detected within 25cm: Robot stops and assesses the environment SG90 Servo Motor rotates the ultrasonic sensor to scan left and right directions Robot compares left and right side distances to choose the clearest path L298N Motor Driver controls four BO motors for precise movement Robot makes intelligent decisions: reverse, turn left, or turn right based on environment ...

Laser Security System Using Arduino Laser Security System Using Arduino This project creates a laser-based security system that triggers an audible and visual alarm when the laser beam is interrupted. The system uses a laser module and LDR sensor to detect intrusions, with a buzzer and LED providing immediate feedback. The alarm features a distinctive "tuuuuu tuuuuu" pattern that lasts for 5 seconds when triggered. How the System Works Laser Module emits a continuous beam of light directed at the LDR sensor LDR (Light Dependent Resistor) detects the laser beam and maintains system in standby mode When the beam is interrupted: System triggers a 5-second alarm cycle Buzzer sounds with a distinctive "tuuuuu tuuuuu" pattern (700ms on, 300ms off) LED flashes in sync with the buzzer for visual indication After 5 seconds: S...

Smart Garage Door Opener Using Arduino Smart Garage Door Opener Using Arduino This project creates an automated garage door system controlled via Bluetooth from your smartphone. The system uses two servo motors to open/close the door, with LED lighting that fades in/out during operation - all housed in a custom 3D printed enclosure. How the System Works Two SG90 servo motors work in tandem to open/close the garage door HC-05 Bluetooth module enables wireless control from a smartphone app When opening: Servos move 120° in opposite directions (0→120 and 120→0) When closing: Servos reverse their movement with different speed settings LED light fades in gradually when door opens completely LED fades out slowly when door closes (after 5 second delay) 7.4V battery powers the entire system with capacitor for voltage stabilization ...

Automatic Street Light Project Using Arduino Automatic Street Light Project Using Arduino This project creates an energy-efficient street light system that automatically illuminates LED lights sequentially when a vehicle is detected by IR sensors. The lights turn on in the direction of vehicle movement and turn off after the vehicle passes. How the System Works Two IR sensors are placed at opposite ends of the street light setup When a vehicle triggers the first sensor, LEDs light up sequentially from that side Each LED turns on with a 500ms delay, creating a smooth lighting effect As the vehicle passes the second sensor, LEDs turn off sequentially The same process works in reverse when a vehicle approaches from opposite direction System maintains lights for 2 seconds after vehicle detection for safety Materials Required Ardui...

DIY Rotating Product Display Stand Using Arduino DIY Rotating Product Display Stand Using Arduino This project demonstrates how to build a smooth-rotating product display stand using an Arduino and a 28BYJ-48 stepper motor. Perfect for product photography, exhibitions, or retail displays, this system provides continuous, adjustable rotation to showcase items from all angles. How the System Works The rotating display uses a 28BYJ-48 stepper motor controlled by an Arduino through direct GPIO pin manipulation. The system features: Precise stepper motor control without additional libraries Adjustable rotation speed through delay timing Power-saving design that cuts power when not rotating Simple, efficient code that's easy to modify Compact design using minimal components Materials...

Car Speed Detector Using Arduino Car Speed Detector Using Arduino This project demonstrates a car speed detection system using Arduino UNO , IR sensors , 16x2 LCD with I2C , buzzer , and basic components. It calculates vehicle speed by measuring the time taken to pass between two sensors and alerts if the speed exceeds the limit. How the System Works Two IR sensors are placed 20 cm apart on a simulated road setup When a vehicle passes the first sensor, a timer starts The timer stops when the vehicle passes the second sensor Speed is calculated using the formula: Speed = Distance / Time The system scales the measurement to simulate a 5-meter distance for practical application Speed is converted to km/h and displayed on the LCD If speed exceeds 50 km/h, the buzzer sounds and displays "Over Speeding" For normal...