Debounced Button

A button doesn't close once — it chatters. The contacts physically bounce, making and breaking dozens of times in the first millisecond. To your code that looks like a user pressing the button twenty times. This block makes one press read as one press.

• R1 (10 k) — pulls the line to VCC: released = HIGH, defined, no floating input.
• SW1 — shorts the line to ground when pressed. Active-low is the convention because pulling down through a switch is the oldest, most noise-robust trick in logic design.
• C1 (100 n) — the actual debouncer. The capacitor can't change voltage instantly, so the chatter becomes one smooth glide: on press it discharges through the switch fast but monotonically; the bounces just interrupt a slide that never reverses enough to re-cross the logic threshold. One press, one edge.

The time constant R1×C1 ≈ 1 ms swallows typical tact-switch bounce. The hidden bonus: C1 discharging through the switch also makes the contacts arc a tiny bit less than a bare GPIO wiring would — gentle on both sides.

Exposes: vcc, out (HIGH = released, LOW = pressed), gnd.

⚠ Disable your pin's internal pull-up when using this block — two pull-ups in parallel shift the RC timing and waste current. And if your firmware ALSO debounces (most frameworks do), pick one place for the job, not two fighting timers.