Electronics

Articles about electronics.

17 tutorials

Use a potentiometer to control an indicator, and learn how analog measurements differ from PWM outputs.

Upload your first sketch, blink the built-in LED, and use Serial Monitor to see what the board is doing.

Wire a button with an internal pull-up, debounce it, and toggle an indicator once per press.

Send commands and readings over USB serial, then choose between UART, I²C, SPI, and networking.

Wire a low-current status indicator and blink it without blocking the rest of your program.

Read an HC-SR501 motion sensor and learn why movement detection is different from occupancy.

Decode an old remote with a 38 kHz receiver and distinguish new presses from held-key repeats.

Move a lightweight pointer with two buttons while powering a micro servo independently of the controller.

Understand a servo conversion, calibrate neutral, and control continuous rotation with a short timed run.

Move a 5 V 28BYJ-48 with a ULN2003 driver, starting slowly and accounting for missed steps and backlash.

Use a 74HC595 to drive eight low-current indicators with three controller pins.

Build a low-side transistor switch, then learn what changes when the load becomes a motor or relay.

Measure distance with an HC-SR04, reject missing echoes, and compare raw readings with a small median filter.

Show readable status symbols on a MAX7219 matrix instead of adding a full screen.

Read a thumb stick, calibrate its resting center, and add a dead zone for stable controls.

Decode a mechanical knob’s direction and count complete quadrature cycles without mistaking every bounce for a turn.

Read an RC522 tag identifier with correct voltage translation, and understand why a UID is not a secure key.