adding pins.pulseIn API

docs/reference/pins.md

@@ -13,6 +13,7 @@ pins.onPulsed(DigitalPin.P0, PulseValue.High, () => {
     
 });
 pins.pulseDuration();
+pins.pulseIn(DigitalPin.P0, PulseValue.High);
 pins.servoWritePin(AnalogPin.P0, 180);
 pins.servoSetPulse(AnalogPin.P0, 1500);
 pins.i2cReadNumber(0, NumberFormat.Int8LE);
@@ -25,4 +26,4 @@ pins.analogSetPitchPin(AnalogPin.P0);
 
 ### See Also
 
-[digitalReadPin](/reference/pins/digital-read-pin), [digitalWritePin](/reference/pins/digital-write-pin), [analogReadPin](/reference/pins/analog-read-pin), [analogWritePin](/reference/pins/analog-write-pin), [analogSetPeriod](/reference/pins/analog-set-period), [map](/reference/pins/map), [onPulsed](/reference/pins/on-pulsed), [pulseDuration](/reference/pins/pulse-duration), [servoWritePin](/reference/pins/servo-write-pin), [servoSetPulse](/reference/pins/servo-set-pulse), [i2cReadNumber](/reference/pins/i2c-read-number), [i2cWriteNumber](/reference/pins/i2c-write-number), [setPull](/reference/pins/set-pull), [analogPitch](/reference/pins/analog-pitch), [analogSetPitchPin](/reference/pins/analog-set-pitch), [spiWrite](/reference/pins/spi-write)
+[digitalReadPin](/reference/pins/digital-read-pin), [digitalWritePin](/reference/pins/digital-write-pin), [analogReadPin](/reference/pins/analog-read-pin), [analogWritePin](/reference/pins/analog-write-pin), [analogSetPeriod](/reference/pins/analog-set-period), [map](/reference/pins/map), [onPulsed](/reference/pins/on-pulsed), [pulseDuration](/reference/pins/pulse-duration), [pulseIn](/reference/pins/pulse-in), [servoWritePin](/reference/pins/servo-write-pin), [servoSetPulse](/reference/pins/servo-set-pulse), [i2cReadNumber](/reference/pins/i2c-read-number), [i2cWriteNumber](/reference/pins/i2c-write-number), [setPull](/reference/pins/set-pull), [analogPitch](/reference/pins/analog-pitch), [analogSetPitchPin](/reference/pins/analog-set-pitch), [spiWrite](/reference/pins/spi-write)

docs/reference/pins/i2c-read-number.md

@@ -27,6 +27,12 @@ format from the 7-bit I2C address `32`.
 pins.i2cReadNumber(32, NumberFormat.UInt16BE);
 ```
 
+#### ~hint
+
+This function is not supported in the simulator.
+
+#### ~
+
 ### See also
 
 [I2C](https://en.wikipedia.org/wiki/I%C2%B2C)

docs/reference/pins/i2c-write-number.md

@@ -27,6 +27,13 @@ address `32` in big-endian 32-bit integer format.
 ```blocks
 pins.i2cWriteNumber(32, 2055, NumberFormat.Int32BE);
 ```
+
+#### ~hint
+
+This function is not supported in the simulator.
+
+#### ~
+
 ### See also
 
 [I2C](https://en.wikipedia.org/wiki/I%C2%B2C)

docs/reference/pins/pulse-in.md

@@ -0,0 +1,53 @@
+# Pulse In
+
+Returns the duration of a pulse (high or low) from a [pin](/device/pins) on
+the micro:bit board in microseconds.
+
+```sig
+pins.pulseIn(DigitalPin.P0, PulseValue.High)
+```
+
+### ~avatar
+
+Some pins are also used by the [LED screen](/device/screen).
+Please read the [page about pins](/device/pins) carefully.
+
+### ~
+
+### Parameters
+
+* ``name`` is a [string](/reference/types/string) that stores the name of the pin (``P0``, ``P1``, or ``P2``, up through ``P20``)
+* ``value`` is the value of the pulse, ``high`` or ``low``
+
+### Returns
+
+* a [number](/reference/types/number) that represents the pulse duration in micro-seconds
+
+### Example: football score keeper
+
+The following script sends a pulse on ``P0`` and reads the pulse returned by a HC-SR04 sonar to determine the distance of the object in front of the sensor.
+
+```blocks
+basic.forever(() => {
+    // send pulse
+    pins.digitalWritePin(DigitalPin.P0, 0)
+    control.waitMicros(2)
+    pins.digitalWritePin(DigitalPin.P0, 1)
+    control.waitMicros(10)
+    pins.digitalWritePin(DigitalPin.P0, 0)
+
+    // read pulse
+    led.plotBarGraph(pins.pulseIn(DigitalPin.P1, PulseValue.High) / 58, 0)
+    basic.pause(100)
+})
+```
+
+#### ~hint
+
+This function is not supported in the simulator.
+
+#### ~
+
+### See also
+
+[digital write pin](/reference/pins/digital-write-pin),