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pxt-microbit Accessibility PR (#529)

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* Accessibility changes
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Sam El-Husseini
2017-09-07 13:42:08 -07:00
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docs/device.md
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# Device
### ~ hint
## ~ hint
**Looking to buy a micro:bit?** See the [list of resellers](https://microbit.org/resellers).
### ~
## ~
All the bits and pieces that make up the BBC micro:bit
![](/static/mb/device-0.png)
### LED Screen and Status LED
## LED Screen and Status LED
The red lights are [LEDs](/device/screen) (light emitting diodes) and form a 5 x 5 LED Screen.
They can be set to on/off and the brightness can be controlled.
@ -20,7 +20,7 @@ They can be set to on/off and the brightness can be controlled.
The yellow light on the back of the micro:bit is the status LED.
It flashes yellow when the system wants to tell the user that something has happened.
### Buttons
## Buttons
Buttons A and B are a form of input. When you press a button, it completes an electrical circuit.
The micro:bit can detect either of its two buttons being pressed/released and be programmed
@ -29,7 +29,7 @@ to act on these events.
Button R on the back of the micro:bit is a system button. It has different uses.
When you have downloaded and run your code onto your micro:bit, press Button R to restart and run your program from the beginning.
### USB connection
## USB connection
When you plug in your micro:bit via [USB](/device/usb), it should appear as a ``MICROBIT`` drive.
@ -38,7 +38,7 @@ the micro:bit will appear as a MAINTENANCE drive instead of ``MICROBIT``. This i
To continue programming your micro:bit YOU MUST unplug your USB and reconnect it. Check that the drive now shows as ``MICROBIT``.
### ~ hint
## ~ hint
Use with caution. If you click on the drive while it shows as ``MAINTENANCE``,
you can see which version of firmware you have running on your micro:bit.
@ -47,31 +47,31 @@ You can find the version of firmware in the 'version.txt' file on the micro:bit.
https://developer.mbed.org/platforms/Microbit/#firmware
### ~
## ~
### Compass
## Compass
The compass can detect magnetic fields such as the Earth’s magnetic field.
As the micro:bit has this compass, it is possible to detect the direction it is moving in.
The micro:bit can detect where it is facing and movement in degrees.
This data can be used by the micro:bit in a program or be sent to another device.
### Accelerometer
## Accelerometer
There is an accelerometer on your micro:bit which detects changes in the micro:bit’s speed.
It converts analogue information into digital form that can be used in micro:bit programs.
Output is in milli-g. The device will also detect a small number of standard actions e.g. shake, tilt and free-fall.
### Pins
## Pins
The [pins](/device/pins) can be a form of electrical input or output.
There are labels for the input/output pins ``P0``, ``P1``, ``P2``, which you can attach external sensors to such as thermometers or moisture detectors.
### Light level
## Light level
The screen can also be used a light level sensor (it's a really cool trick).
### Runtime
## Runtime
The micro:bit embodies many fundamental concepts in computer science. To learn more, read [the micro:bit - a reactive system](/device/reactive).
@ -80,15 +80,15 @@ Sometimes, your micro:bit may display an error code. For more information, see:
* [the error codes](/device/error-codes)
### How do I connect the micro:bit to my computer?
## How do I connect the micro:bit to my computer?
Your micro:bit can be connected to your computer via a micro USB cable.
Data can be sent and received between the micro:bit and the computer so programs
can be downloaded from Windows, Macs and Chromebooks onto the micro:bit via this USB data connection.
You can read more information on how to run scripts on your micro:bit [here](/device/usb),
and about the error messages you might get [here](/device/error-codes).
[Click here to read more information on how to run scripts on your micro:bit](/device/usb),
and [click here to read more about the error messages you might get](/device/error-codes).
### Powering your micro:bit
## Powering your micro:bit
When your micro:bit is connected to your computer with the micro USB, it doesn’t need another power source.
When your micro:bit isn’t connected to your computer, tablet or mobile, you will need 2 x AAA 1.5 V batteries to power it.
@ -96,11 +96,11 @@ When your micro:bit isn’t connected to your computer, tablet or mobile, you wi
The pins labelled 3V and GND are the power supply pins.
You can attach an external device such as a motor to these and power it using the battery or USB.
### Serial Communication
## Serial Communication
The micro:bit can send an receive data via [serial communication](/device/serial). The serial data can be transfered via USB or BLE.
### Bluetooth Low Energy (BLE) Antenna
## Bluetooth Low Energy (BLE) Antenna
You will see the label BLE ANTENNA on the back of your micro:bit. It is for a messaging service,
so that devices can talk to each other. The micro:bit is a peripheral
@ -108,7 +108,7 @@ device which can talk to a central device like a smart phone or tablet that has
The micro:bit can send signals and receive signals from a central device so another BLE device can
control the micro:bit or the micro:bit can control another BLE device.
### Technical Information
## Technical Information
The micro:bit has been designed to be a bare-board micro controller for use by children aged 11-12.
More information is available at the [Microbit Foundation web site](https://microbit.org/device).