distance meter

This project features an Arduino Nano-based control system for interfacing with an ultrasonic sensor (HC-SR04), an LCD display (16x2), and a laser module. The ultrasonic sensor measures distances, and the results are displayed on the LCD. A transistor-based circuit (2N3904) is used to control the laser module. A 12V regulator (7805ACV) steps down the power for the components, while a switch allows easy power control from a 12V battery. This setup is ideal for small robotics, distance measurement, or automation projects with real-time feedback.