1 # Code Club - Mini Band Project
3 Make your own mini band!
4 You and your friends can form your own finger-sized band and rock out using Raspberry Pi and Arduino.
5 Learn how to build circuits with sensors and outputs and write a simple programme to control your instruments.
15 * 1 x Raspberry Pi (plus monitor and power supply)
17 * 2 x Arduino Uno boards (with USB cables)
18 * 1 x strip potentiometer
20 * 4 x piezo buzzers (the type in greetings cards, easy to get from Maplin)
22 * Bread boards (1 per instrument)
24 * Sugru (or some other modelling material)
26 * Plastic drinking straw
30 ## Software requirements:
33 * IDE developer environment for Arduino
38 ### 1. Make your drums
40 Take your 4 piezo buzzers and attach a ring of Sugru (or other modelling material) as shown in the picture.
41 This will increase the flexibility and resonance of the sensors. Let the sugru set.
44 ### 2. Connect the circuit
46 Piezo buzzers generate a small charges when you tap them, so they don’t need a power source.
47 Connect one lead from your buzzer to one of your analogue inputs, and connect the other lead to ground.
48 Repeat for each of your drums. It is easiest to use a bread board for making your circuit.
49 Look at the picture for an example.
52 ### 3. Progam the Arduino
54 Find the appropriate code from the respository and upload to your Ardunio board.
57 ### 4. Set up in Scratch
59 Find four different drum sounds (or whatever sounds you'd like your drums to make!). Upload the sounds to Scratch.
64 ### 1. Make your guitar
66 Grab your strip potentiomater, a piece of thin card, and a pencil.
67 Lightly draw round your potentiometer on the card and then use this as a guide to draw out your guitar shape.
68 (The potentiomater will be the fret board of your guitar).
69 Cut out and colour in the guitar and stick down the potentiomater.
70 Tape a pencil or stick to the back of the guitar to make it stiffen the fret board.
72 ### 2. Connect the circuit
74 The potentiomater strip adjusts resistance, so you will need to feed it some electricity.
75 Run +5V into one of the strip’s outer pins, and ground into the other outer pin.
76 It doesn’t matter which way around you connect these, but it will affect which the direction
77 the fretboard runs (high and the top, low at the bottom or vice-versa).
79 Signal will come from the centre pin, so connect that to one of your analogue inputs and you should be good to go.
81 ### 3. Set up in Scratch
87 ### 1. Make your maracas
89 Cut 2 short lengths of drinking straw for your maraca handles.
90 Using Sugru (or other modelling material), make 2 maraca heads by rolling it up into balls.
91 Push the maraca heads onto the straws and mold into a maraca shape.
92 Connect lengths of wire to the connectors of the 2 tilt sensors and then push each sensor into a straw until it presses into the Sugru.
93 Leave the Sugru to set.
96 ### 2. Connect the circuit
98 Connect the +5V port on the Arduino board to one of the pins on the tilt switch (it doesn't matter which way round).
99 Connect the other pin to an empty digital input on the board.
105 ## Pull-down Resistors
107 You’ll find your analogue inputs receive signal when you don’t expect them to.
108 This is because there’s electricty floating around in the system, or something like that.
110 To fix this, you need to wire each input to ground, through a 10KΩ resistor.
112 A better explanation can be found [here](http://arduino.cc/en/Tutorial/DigitalPins).