ตัดการเด้งด้วย millis()

You could pause with delay() after a press, but that freezes your whole board. The smarter tool for clean buttons is millis().

millis() returns how many milliseconds your board has been running. You compare two readings to measure elapsed time without stopping.

The idea is simple: when the pin changes, start a timer. Only trust the new state if it holds steady past a short window.

A delay of about 50 milliseconds is the classic choice. It's long enough to outlast bounce, yet far too fast for you to notice.

You need a variable to store when the pin last flipped. Compare it to the current time on every loop pass.

Keep the raw reading and the confirmed stable state separately. The raw one is noisy; the stable one is what your logic trusts.

Each loop, read the pin. If it differs from the last raw value, the signal just moved, so reset your timer.

If enough time has passed since the last flip, the reading has settled. Now it is safe to accept it as the real state.

To fire once per press, watch for the stable state changing to LOW. That single edge is your clean, debounced press.

At the loop's end, save the current readings into your last variables. This keeps the comparison fresh on every pass.

Because millis() never pauses the board, your sensors and outputs keep running. You debounce while everything else stays alive. 🚀

Let's check how millis() debouncing decides a press is real.

You used millis() to ignore bounce without freezing the board, accepting a press only once it settles. Solid, professional input! ✅