pxt-calliope/docs/projects/guitar/pinpress.md
2016-11-01 17:44:37 -07:00

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