Wrote new advanced topic

docs/reference/pins/pulse-duration.md

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+# Pulse Duration
+
+Gets the duration of the last pulse in microseconds.
+
+This function should be called from an **on pulsed** handler.
+
+```sig
+pins.pulseDuration();
+```
+
+### Returns
+
+The duration of the last pulse, measured in microseconds.
+
+### Example
+
+The following example waits for pin ``P0`` to be pulsed high, and then
+displays the duration of the pulse in microseconds on the LED screen.
+
+```blocks
+pins.onPulsed(DigitalPin.P0, PulseValue.High, () => {
+    basic.showNumber(pins.pulseDuration());
+});
+```
+
+### See also
+
+[servo set pulse](/reference/pins/servo-set-pulse),
+[on pulsed](/reference/pins/on-pulsed),
+[digital read pin](/reference/pins/digital-read-pin)