Visualizing Keypad Scanning with LEDs using Arduino Mega
Aug 31, 2025 · 2 min read · Let’s Think About How the Keypad Works Let’s think about how the keypad is working and how the microcontroller detects which key is pressed. To make this process visible, I built a small project with two 4×4 keypads and 16 LEDs connected to an Arduin...
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