Updates for V4 (#197)

* update yotta defaults for 16kb devices

* refactor deprecated blocks

* updates for button events

* update button events

* update refference

* update docs

* update docs

* update button event blocks

* update docs

* update block id

docs/reference/pins/digital-read-pin.md

@@ -48,7 +48,7 @@ keeper @boardname@, you can press button `B` on the remote to buzz and
 make the score bigger on the other @boardname@.
 
 ```blocks
-input.onButtonEvent(Button.B, ButtonEvent.Click, () => {
+input.onButtonEvent(Button.B, input.buttonEventClick(), () => {
     pins.digitalWritePin(DigitalPin.P1, 1);
     basic.pause(500);
     pins.digitalWritePin(DigitalPin.P1, 0);

docs/reference/pins/digital-write-pin.md

@@ -46,7 +46,7 @@ will use ``digital write pin`` to make the other @boardname@ buzz and
 make the score bigger.
 
 ```blocks
-input.onButtonEvent(Button.B, ButtonEvent.Click, () => {
+input.onButtonEvent(Button.B, input.buttonEventClick(), () => {
     pins.digitalWritePin(DigitalPin.P1, 1);
     basic.pause(500);
     pins.digitalWritePin(DigitalPin.P1, 0);

docs/reference/pins/neopixel-matrix-width.md

@@ -0,0 +1,35 @@
+# Neopixel matrix width
+
+For Neopixel matrix (strip) on the specified [pin](/device/pins),
+set the width of that matrix. This informs the simulator to display
+the Neopixel strip as a matrix.
+
+```sig
+pins.setMatrixWidth(Digital.P1, 16)
+```
+
+## Parameters
+
+* ``name``: The @boardname@ hardware pin to configure (``P0``-``P20``)
+* ``width``: a [number](/types/number) (for example, from `2` through `16`)
+
+## Example
+
+To use the example below, you should add the Neopixel extension to your
+project and then copy the JavaScript code below over to your project. 
+The example creates a strip of 25 neopixels corresponding to a 5x5 matrix and then draws 
+an `X` on the matrix. Try changing the value of the variable `width`
+to get matrices of different sizes.
+
+```blocks
+let width = 5
+let strip = neopixel.create(DigitalPin.P1, width * width, NeoPixelMode.RGB)
+strip.setMatrixWidth(width)
+pins.setMatrixWidth(DigitalPin.P1, width)
+for (let i = 0; i <= width - 1; i++) {
+    strip.setMatrixColor(i, i, neopixel.colors(NeoPixelColors.Red))
+    strip.setMatrixColor(width - (i + 1), i, neopixel.colors(NeoPixelColors.Blue))
+}
+strip.show()
+```
+

docs/reference/pins/set-audio-pin.md

@@ -0,0 +1,34 @@
+# set Audio Pin
+
+Set the [pin](/device/pins) (P0, P1, P2) that is used to play music and generate tones.
+
+```sig
+pins.setAudioPin(AnalogPin.P0)
+```
+
+### ~ hint
+
+#### micro:bit V2 speaker
+
+With the [micro:bit V2](/device/v2) hardware, the built-in speaker will play (mirror) the same tones and music sent to the audio pin.
+
+### ~
+
+## Parameters
+
+* **name**: the pin to set for audio output: `P0`, `P1`, or `P2`.
+
+## Example
+
+Play a tone for the "A4" note at pin **P0** for 1 second.
+
+```blocks
+pins.setAudioPin(AnalogPin.P0)
+let frequency = 440
+let duration = 1000
+pins.analogPitch(frequency, duration)
+```
+
+## See also
+
+[@boardname@ pins](/device/pins), [analog set pitch pin](/reference/pins/analog-set-pitch-pin)