128 lines
3.2 KiB
Markdown
128 lines
3.2 KiB
Markdown
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# Pin Press Switch
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### @description micro:bit guitar: use pin press to toggle guitar play on/off
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### ~avatar avatar
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Use pin press to switch guitar play on/off
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* **Duration:** approximately 45 minutes
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* **Materials:**
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* 2-3 Crocodile clips
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* Concepts:
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* Circuit
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* Conductor
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* Variable/Global-Variable
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* Conditional: **`if`**, **`else`**
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* Boolean: **`True`/`False`**
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### ~
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## Blocks
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```cards
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var on = false
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on;
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if (on) { } else {}
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input.onPinPressed(TouchPin.P1, () => {})
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```
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### ~hint
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## Circuits & Switches
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* **Circuits** need a power supply (battery), a resister (like a LED) & a conductor (metal, water, hand)
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* **Switches** turn electric power on by closing (completing) a circuit with a conductor so power can flow
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**Metal foil and wires make excellent conductors**
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**In this activity we use YOU to conduct electricity**
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**to close the circuit that switches the guitar ON and OFF!**
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### ~
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## Step 1: Pin Press Test
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```blocks
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input.onPinPressed(TouchPin.P0, () => {
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basic.showNumber(0)
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})
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input.onPinPressed(TouchPin.P1, () => {
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basic.showNumber(1)
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})
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input.onPinPressed(TouchPin.P2, () => {
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basic.showNumber(2)
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})
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```
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**Create the pin-press code**
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**Download the code** on the micro:bit
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https://youtu.be/PAIU-vHqyGU
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**Hold the micro:bit touching The GND pin with one hand**
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**with the other hand alternately touch the 0, 1 and 2 pins**
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### ~hint
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**The electric signal traveled from pins, between your hands to `GND` and the micro:bit detected the electric signal!**
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### ~
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## Step 2: Installing conductive foil on the guitar
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https://youtu.be/NX0ECcpXFes
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**Add foil to the guitar body where it is easy to touch while playing**
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**Connect the foil to `GND` using a crocodile clip**
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https://youtu.be/YkymZGNmkrE
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**Add foil to the guitar neck**
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**Connect the foil to `pin 1` using a crocodile clip**
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## Step 3: Add a switch to turn the guitar ON and OFF
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**Using the `on` global variable we can switch the message on the micro:bit**
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**between ON and OFF**
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```blocks
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let on = false
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basic.forever(() => {
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if (on == true) {
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basic.showString("ON")
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} else {
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basic.showString("OFF")
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}
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})
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input.onPinPressed(TouchPin.P1, () => {
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if (on == true) {
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on = false
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} else {
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on = true
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}
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})
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```
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**Create the ON/OFF switch code**
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**Download the code on the micro:bit**
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**Test by touching `P1` to toggle the LED message between ON and OFF**
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*Final code*
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TODO: do we want to use `on = !on;` or be more direct in flipping the switch? `on = true; on = false;`
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```blocks
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var on = false
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basic.forever(() => {
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if (on) {
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music.setTempo(pins.map(Math.abs(input.acceleration(Dimension.Y)),
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0, 1023,
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60, 320))
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music.playTone(
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input.lightLevel() * 25,
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music.beat(BeatFraction.Quarter)
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);
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} else {
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music.rest(music.beat())
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}
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})
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input.onPinPressed(TouchPin.P1, () => {
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on = !on;
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})
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```
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## Now Play!
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**Turn the guitar ON and OFF with a pin press on the connected foil**
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**touching both pieces of foil at the same time to connect the switches**
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https://youtu.be/GYmdTFvxz80
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