# Touch Tone for Circuit Playground Express

## Overview

https://youtu.be/2MKndPYqgps

## Interactive Projects

Using MakeCode and Circuit Playground Express you can make interactive projects using lights and sound. In this project we'll build a custom PCB for the CPX and use capacitive touch to make a playable mini synth instrument. 

![](https://cdn-learn.adafruit.com/assets/assets/000/056/291/medium800/3d_printing_makecode-cpx.jpg?1530043616)

## DIY Mini Synth with Capacitive Touch

Build your own capacitive touch pads using [copper tape](https://www.adafruit.com/product/1128), [bare conductive paint](https://www.adafruit.com/product/1305) or other electrically conductive material! The code used in this project works the same with any conductive material.

## 3D Printing and CNC Milling

This project uses both processes to create a custom synthesizer that is simple to use. This guide will cover basics of using the Bantam Tools Desktop CNC and Eagle CAD to create PCB shields for the Circuit Playground Express.

![3d_printing_cpx-touchtone-pcb.jpg](https://cdn-learn.adafruit.com/assets/assets/000/056/279/medium640/3d_printing_cpx-touchtone-pcb.jpg?1530042148)

### Circuit Playground Express

[Circuit Playground Express](https://www.adafruit.com/product/3333)
 **Circuit Playground Express** is the next step towards a perfect introduction to electronics and programming. We've taken the original Circuit Playground Classic and made it even better! Not only did we pack even more sensors in, we also made it even easier to...

In Stock
[Buy Now](https://www.adafruit.com/product/3333)
[Related Guides to the Product](https://learn.adafruit.com/products/3333/guides)
![A Black woman's manicured hand holds a round microcontroller with lit up LEDs.](https://cdn-shop.adafruit.com/640x480/3333-05.jpg)

## Tools, hardware and supplies

Here's a list of some handy things I use when cutting some PCBs. 

### Part: Bantam Tools Desktop CNC
quantity: 1
PCB milling machine
[Bantam Tools Desktop CNC](https://www.bantamtools.com/)

### Part: Single Sided PCB blanks
quantity: 1
FR-1 4" x 5" copper clad boards
[Single Sided PCB blanks](https://www.bantamtools.com/collections/materials/products/pcb)

### Part: Spatula Palette Knife
quantity: 1
thin prying tool for removing parts
[Spatula Palette Knife](http://a.co/hLNYDWH)

### Part: Double-sided Tape
quantity: 1
19mm (3/4in) wide tape for securing
[Double-sided Tape](http://a.co/dDmox3e)

### Part: Squeeze Bottle
quantity: 1
Wash Bottle for Alcohol
[Squeeze Bottle](http://a.co/1YDVHoB)

### Part: X-Acto Knife
quantity: 1
Precision Knife
[X-Acto Knife](http://a.co/j1WrVUy)

### Part: M3 x .5 x 6mm screws
quantity: 14
Button Head screws
[M3 x .5 x 6mm screws](https://www.albanycountyfasteners.com/Button-Socket-Head-Cap-Screw-3MM-Stainless-Steel-p/5400000.htm)

### Part: M3 x .5 Hex Nuts
quantity: 14
Metric Hex Jam Nuts 1.5mm
[M3 x .5 Hex Nuts](https://www.albanycountyfasteners.com/Metric-Hex-Jam-Nuts-A2-Stainless-Steel-p/5580000.htm)

### Part: Gray Blue Silicone Mat
quantity: 1
Large Silicone Heat Insulation Pad
[Gray Blue Silicone Mat](http://a.co/c8KtVxn)

### Part: Googly Eyes
quantity: 1
12mm size in diameter
[Googly Eyes](http://a.co/iAyhfhF)

- [Next Page](https://learn.adafruit.com/touch-tone-for-circuit-playground-express/software.md)

## Featured Products

### Circuit Playground Express

[Circuit Playground Express](https://www.adafruit.com/product/3333)
 **Circuit Playground Express** is the next step towards a perfect introduction to electronics and programming. We've taken the original Circuit Playground Classic and made it even better! Not only did we pack even more sensors in, we also made it even easier to...

In Stock
[Buy Now](https://www.adafruit.com/product/3333)
[Related Guides to the Product](https://learn.adafruit.com/products/3333/guides)

## Related Guides

- [Adafruit Circuit Playground Express](https://learn.adafruit.com/adafruit-circuit-playground-express.md)
- [Magic Light Bag of Holding](https://learn.adafruit.com/magic-light-bag-of-holding.md)
- [Lucky Cat with Circuit Playground Express](https://learn.adafruit.com/lucky-cat-with-circuit-playground-express.md)
- [Machine Learning with Marshmallows and Tiny Sorter](https://learn.adafruit.com/machine-learning-with-marshmallows-and-tiny-sorter.md)
- [Four Seasons Fairy Bottle Lanterns](https://learn.adafruit.com/four-seasons-fairy-bottle-lanterns.md)
- [Make it Move with Crickit](https://learn.adafruit.com/make-it-move-with-crickit.md)
- [CircuitPython Basics: Analog Inputs & Outputs](https://learn.adafruit.com/circuitpython-basics-analog-inputs-and-outputs.md)
- [Which CircuitPython Board is Right for You?](https://learn.adafruit.com/choose-your-circuitpython-board.md)
- [Makey Paper Craft ](https://learn.adafruit.com/makey-paper-craft.md)
- [Infrared Transmit and Receive on Circuit Playground Express in C++](https://learn.adafruit.com/infrared-transmit-and-receive-on-circuit-playground-express-in-c-plus-plus-2.md)
- [CircuitPython Snow Globe](https://learn.adafruit.com/circuitpython-snow-globe.md)
- [Make It Plot](https://learn.adafruit.com/make-it-graph-plot.md)
- [Welcome to CircuitPython!](https://learn.adafruit.com/welcome-to-circuitpython.md)
- [Esenciales para CircuitPython](https://learn.adafruit.com/esenciales-para-circuitpython.md)
- [Circuit Playground Bluefruit Automatic Bike Brake Light](https://learn.adafruit.com/circuit-playground-bluefruit-brake-light.md)
- [Cartoon Network and Make Code - Rose Quartz Shield Umbrella](https://learn.adafruit.com/cartoon-network-and-make-code-rose-quartz-shield-umbrella.md)