engineering projects

Arduino IR Remote Tutorial: Control an LED, Then Add a Servo Door

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Arduino IR remote LED & servo door demo: Uno + KY-022, LED on breadboard, SG90 opening latch, kit remote in hand.

Build an Arduino IR remote LED controller with a KY-022 receiver, then upgrade the same circuit to operate a servo-driven door. Includes wiring diagrams, IR scanner code, complete Arduino sketches, troubleshooting, and FAQ.

Arduino Password Door Lock with Keypad and LCD

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Arduino Password Door Lock with keypad, LCD and servo motor demo setup

Step-by-step tutorial for building an Arduino password door lock using a 4×4 keypad, 16×2 I2C LCD display, and SG90 servo motor. Includes full wiring diagram, complete Arduino code, line-by-line code breakdown, testing tips, troubleshooting guide, FAQ, and upgrade ideas.