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Some linking for 'speakers' hw video (#1997)

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Galen Nickel 2019-04-10 11:01:25 -07:00 committed by Peli de Halleux
parent 5ac97925a2
commit a045ba378e
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docs/projects/SUMMARY.md
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@ -89,3 +89,5 @@
* [Temperature Sensor](https://youtu.be/_T4N8O9xsMA) * [Temperature Sensor](https://youtu.be/_T4N8O9xsMA)
* [Pin Pressed](https://youtu.be/GEpZrvbsO7o) * [Pin Pressed](https://youtu.be/GEpZrvbsO7o)
* [Radio](https://youtu.be/Re3H2ISfQE8) * [Radio](https://youtu.be/Re3H2ISfQE8)
* [Servo Motor](https://youtu.be/okxooamdAP4)
* [Speakers](https://youtu.be/cxfPNc4Wefo)

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docs/projects/hack-your-headphones/make.md
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@ -46,6 +46,13 @@ Using the 2nd crocodile clip, connect the second end of the crocodile clip onto
You hacked your headphones! You hacked your headphones!
## Step 6
Watch this video to see how speakers and headphones make sound when connected to your @boardname@.
https://www.youtube.com/watch?v=cxfPNc4Wefo
<br/>
## ~button /projects/hack-your-headphones/code ## ~button /projects/hack-your-headphones/code
NEXT: music of light NEXT: music of light

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docs/reference/music/making-melodies.md
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@ -8,6 +8,14 @@ A _note_ is a tone that is recognized as part of music. A note has a name like '
On your @boardname@, a note is played on the speaker by sending a signal to a it with a certain _frequency_ called [Hertz](http://wikipedia.org/Hertz). Frequency is how fast something vibrates during one second. If you ring a bell that was made to play an '**A**' note, the bell will vibrate at 440 Hertz (440 times per second). So, notes are just certain frequencies that have special names. On your @boardname@, a note is played on the speaker by sending a signal to a it with a certain _frequency_ called [Hertz](http://wikipedia.org/Hertz). Frequency is how fast something vibrates during one second. If you ring a bell that was made to play an '**A**' note, the bell will vibrate at 440 Hertz (440 times per second). So, notes are just certain frequencies that have special names.
## ~ hint
Watch this video to see how speakers and headphones make sound when connected to your @boardname@.
https://www.youtube.com/watch?v=cxfPNc4Wefo
### ~
In history, music came from tones that seemed nice to hear. The tones were played on wood, strings, metal, and skins. These tones were given names and they became what we know today as musical notes. Notes were named so we could write them down and remember how to play them again later. In history, music came from tones that seemed nice to hear. The tones were played on wood, strings, metal, and skins. These tones were given names and they became what we know today as musical notes. Notes were named so we could write them down and remember how to play them again later.
## How are notes named? ## How are notes named?