Peli de Halleux 2ae78fe6b8 Updated guitar lessons (#268 )

* initial notes

* updated code samples

* splitting the page and preparing layout

* missing gamepad api

* added basic guitar activty md files

added initial draft of guitar lesson - in progress

* word smithing and adding detail for concepts listed

* word smithing and adding detail for concepts listed

* typo in file name

* missing macro

* replaced guitar.png with image from Julia Carlson

* adding a few pictures

* adding cards macros

* few tweaks

* image for accellerometer lesson xyz axis

* fixed the numbering buttons page
-fixed the numbering to restart for each section and asdded spaces after so they don't wrap

* adding a few video links

* pin-press - added circuit info

* more vids

* fixing latest commit

* edits to light sensor and pin-press

* updated descriptions, linking lesson

* pin-press and display-buttons updates
-added dode samples to pin press

* updated making video

* light-sensor updated numbering

* Clean up
Clean up of headings to template style, other fixes

* putting display in template
use h2 with "Step 1:" and image before text

* removed numbered lists for display & light
these topics are code complete

* more consistent formating
Acceleromenter, buttons, light sensosr

* Acceleration Lesson, added art
Lesson steps for Acceleration, art for degree F to C for Map anology+clean up of light sensor topic

* Pin Press code complete
some other basic fomats and edits

* Removed dashes in lesson names
renamed and fixed references to files with "-" in names

* rest of fles w/ dash in name changes

* fixed links to guitar activities

* updated acceleraomter section

* transparency 4 art, image text
added transarency and renamed art, added descriptive text for video and still images

* renamed art

* fixing the merge

* fixing hint

* moved step 2 outside ~hint block

* fixing snippets

* remove guitar from project list

* Duration/Materials consistent  format
moved out of ~avatar block

2016-10-03 14:59:58 -07:00

3.3 KiB

Raw Blame History

Accelerometer Beat control

@description micro:bit guitar: using accelerometer to control tempo

~avatar avatar

Use the Accelerometer to control guitar tempo

Concepts:
- Gravity
- Acceleration
- X, Y, Z coordinates
- Tempo
- Beat
- Mapping
- Graphing
- Absolute value

~

Duration: 30 - 45 minutes

accelerometer controlled tempo
https://youtu.be/h_gPkBaVkoo TODO: add sound to video

Blocks

input.acceleration(Dimension.Y)
music.setTempo(120)
pins.map(0, 0, 1023,60, 320)
Math.abs(1)

Accelerometer, gravity and tilting!

The micro:bit contains an accelerometer sensor that is able to measure forces applied to the board. On earth, we are subject to the gravity force which pulls us to the ground!

https://youtu.be/0SULoTKmkhI

When the micro:bit is flat on a table, with the screen pointing up, the gravity force is aligned with the Z axis of the micro:bit.

If you tilt it up and down, the force will align with the Y axis -- this is how we can detect tilting!!! If the force along Y grows, the micro:bit is tilting more and more vertically!

Measuring Acceleration along different coordinates (X, Y, Z axis)

The acceleration block approximately measures milli-g, which is 1/1000 of a g or the acceleration of gravity.

Step 1: Graphing acceleration

basic.forever(() => {
    led.plotBarGraph(input.acceleration(Dimension.Y), 1023)
})

Create the code that measures the change in the Y axis acceleration as a graph on the LEDs

Dowload the code to the micro:bit

Test the movements that move the graph from 1 to 5 bars on the LEDs

Extra

Try graphing the acceleration along the X and Z axis. Can you explain the differences?

~hint

Mapping

It is common to map one standard to another - such as with temperature

~

Step 2: Mapping acceleration to Beat

micro:bit sensors produce signal values between 0 to 1023. The map block converts the signal to a desired range.

basic.forever(() => {
        music.setTempo(pins.map(Math.abs(input.acceleration(Dimension.Y)),
            0, 1023,
            60, 320))
         music.playTone(Note.C, music.beat(BeatFraction.Quarter));
})

Create the code that Maps Y axis acceleration as tempo

Download the code to the micro:bit on the guitar

Test the movements that speed and slow the tempo

Step 3: Combine with light sensor tone control

Put it all together!

basic.forever(() => {
        music.setTempo(pins.map(Math.abs(input.acceleration(Dimension.Y)),
            0, 1023,
            60, 320))
        music.playTone(
            input.lightLevel() * 25,
            music.beat(BeatFraction.Quarter)
        );
})

Combine the code above with the light sensor tone control code from the previous activity