docs: Include V2 features in tutorials (#709)

* docs: update-tutorials for V2

* docs: update images

* remove pin functions reference link

* reduce size of image

* Update docs/pin.rst

* Update docs/pin.rst

* Update docs/tutorials/io.rst

Co-authored-by: Carlos Pereira Atencio <carlos@microbit.org>

Author: microbit-mark

docs/tutorials/blue-microbit.png

@@ -18,6 +18,8 @@ display is a part of the ``Image`` object and called ``HAPPY``. We tell
 ``show`` to use it by putting it between the parenthesis (``(`` and ``)``).
 
 .. image:: happy.png
+    :width: 300px
+    :align: center
 
 Here's a list of the built-in images:
 

docs/tutorials/happy.png

@@ -1,31 +1,37 @@
-Input/Output
-------------
+Input/Output Pins
+-----------------
 
 There are strips of metal along the bottom edge of the BBC micro:bit that make
 it look as if the device has teeth. These are the input/output pins (or I/O pins
 for short).
 
 .. image:: blue-microbit.png
+    :width: 300px
+    :align: center
+    :alt: micro:bit with pins labelled
 
 Some of the pins are bigger than others so it's possible to attach crocodile
 clips to them. These are the ones labelled 0, 1, 2, 3V and GND (computers
 always start counting from zero). If you attach an edge connector board to the
 device it's possible to plug in wires connected to the other (smaller) pins.
 
-Each pin on the BBC micro:bit is represented by an *object* called ``pinN``
-where ``N`` is the pin number. So, for example, to do things with the pin
-labelled with a 0 (zero), use the object called ``pin0``.
+On the latest micro:bit **V2** the micro:bit logo can also be used as a touch
+input.
 
-Simple!
+In MicroPython, each pin on the BBC micro:bit is represented by an *object*
+called ``pinN``, where ``N`` is the number pf the pin. 
+
+For example, to use the pin labelled 0 (zero), you can use the object called
+``pin0`` in your script. The logo pin **V2** uses ``pin_logo``.
 
 These objects have various *methods* associated with them depending upon what
-the specific pin is capable of.
+the specific pin is capable of eg. read, write or touch.
 
 Ticklish Python
 +++++++++++++++
 
 The simplest example of input via the pins is a check to see if they are
-touched. So, you can tickle your device to make it laugh like this::
+touched. So, you can tickle your micro:bit to make it laugh like this::
 
     from microbit import *
 
@@ -35,18 +41,32 @@ touched. So, you can tickle your device to make it laugh like this::
         else:
             display.show(Image.SAD)
 
-With one hand, hold your device by the GND pin. Then, with your other hand,
+With one hand, hold your micro:bit by the GND pin. Then, with your other hand,
 touch (or tickle) the 0 (zero) pin. You should see the display change from
 grumpy to happy!
 
+When you use the latest micro:bit **V2** you can also change the default
+behaviour of the pin, so that you don't have to touch GND at all.::
+
+    from microbit import *
+    pin0.set_touch_mode(pin0.CAPACITIVE)
+    while True:
+        if pin0.is_touched():
+            display.show(Image.HAPPY)
+        else:
+            display.show(Image.SAD)
+
+The default for the edge connector pins is `resistive` and the logo pin
+**V2** is `capacitive`.
+
 This is a form of very basic input measurement. However, the fun really starts
 when you plug in circuits and other devices via the pins.
 
 Bleeps and Bloops
 +++++++++++++++++
 
-The simplest thing we can attach to the device is a Piezo buzzer. There are two 
-types of piezo buzzers. The simplest type to use are called active buzzers. 
+The simplest thing we can attach to the micro:bit is a Piezo buzzer. There are
+two types of piezo buzzers. The simplest type to use are called active buzzers. 
 Active buzzers contain an oscillator that produces a tone at a predetermined
 pitch when a current is passed through them.  Passive buzzers require an 
 oscillating current to be passed through them to produce a tone at the frequency
@@ -55,11 +75,17 @@ one tone, while passive buzzers are slightly more complicated to use but can
 produce a variety of tones.
 
 .. image:: piezo_buzzer.jpg
+    :width: 250px
+    :align: center
+    :alt: piezo buzzer
 
 We're going to use an active piezo buzzer for output. To attach one to your BBC 
 micro:bit you should attach crocodile clips to pin 0 and GND (as shown below).
 
 .. image:: pin0-gnd.png
+    :width: 250px
+    :align: center
+    :alt: piezo connected to pin0 and GND
 
 The wire from pin 0 should be attached to the positive connector on the buzzer
 and the wire from GND to the negative connector.

docs/tutorials/images.rst

@@ -2,18 +2,23 @@ Music
 -----
 
 MicroPython on the BBC micro:bit comes with a powerful music and sound module.
-It's very easy to generate bleeps and bloops from the device *if you attach a
-speaker or passive piezo buzzer*. Use crocodile clips to attach pin 0 and GND
-to the positive and negative inputs on the speaker/buzzer - it doesn't matter
-which way round they are connected to a speaker, but a piezo buzzer may be
-polarized (check for a "+" marking the positive terminal).
+It's very easy to generate bleeps and bloops from the device by attaching a
+speaker or set of wired headphones, or by using the built-in speaker **V2**.
+
+If you are attaching a speaker, a passive piezo buzzer, or headphones, you can
+use crocodile clips to attach pin 0 and GND to the positive and negative inputs.
+It doesn't matter which way round they are connected to a speaker, but a piezo
+buzzer may be polarized (check for a "+" marking the positive terminal).
 
 .. image:: pin0-gnd.png
+    :width: 250px
+    :align: center
+    :alt: piezo connected to pin0 and GND
 
 .. note::
 
-    Do not attempt this with an active Piezo buzzer - such buzzers are only able to
-    play a single tone.
+    Do not attempt this with an active Piezo buzzer - such buzzers are only
+    able to play a single tone.
 
 Let's play some music::
 

docs/tutorials/io.rst

@@ -1,18 +1,6 @@
 Speech
 ------
 
-.. warning::
-
-    WARNING! THIS IS ALPHA CODE.
-
-    We reserve the right to change this API as development continues.
-
-    The quality of the speech is not great, merely "good enough". Given the
-    constraints of the device you may encounter memory errors and / or
-    unexpected extra sounds during playback. It's early days and we're
-    improving the code for the speech synthesiser all the time. Bug reports
-    and pull requests are most welcome.
-
 Computers and robots that talk feel more "human".
 
 So often we learn about what a computer is up to through a graphical user
@@ -42,9 +30,14 @@ In any case, we're going to create a DALEK poetry recital on demand.
 Say Something
 +++++++++++++
 
-Before the device can talk you need to plug in a speaker like this:
+If you have the latest micro:bit **V2** device, you can use the built-in
+speaker as well as or instead of connecting a speaker or set of headphones
+like this:
 
-.. image:: ../speech.png
+.. image:: pin0-gnd.png
+    :width: 250px
+    :align: center
+    :alt: piezo connected to pin0 and GND
 
 The simplest way to get the device to speak is to import the ``speech`` module
 and use the ``say`` function like this::
@@ -58,10 +51,10 @@ change some of the parameters that the speech synthesiser uses to produce the
 voice. Our speech synthesiser is quite powerful in this respect because we can
 change four parameters:
 
-* ``pitch`` - how high or low the voice sounds (0 = high, 255 = Barry White)
-* ``speed`` - how quickly the device talks (0 = impossible, 255 = bedtime story)
-* ``mouth`` - how tight-lipped or overtly enunciating the voice sounds (0 = ventriloquist's dummy, 255 = Foghorn Leghorn)
-* ``throat`` - how relaxed or tense is the tone of voice (0 = falling apart, 255 = totally chilled)
+* ``pitch`` - how high or low the voice sounds (0 = high, 255 = low)
+* ``speed`` - how quickly the device talks (0 = fast, 255 = slow)
+* ``mouth`` - how tight-lipped or overtly enunciating the voice sounds (0 = closed mouth, 255 = open mouth)
+* ``throat`` - how relaxed or tense is the tone of voice (0 = tense, 255 = relaxed)
 
 Collectively, these parameters control the quality of sound - a.k.a. the
 timbre. To be honest, the best way to get the tone of voice you want is to