From the Adafruit Forums: 12 Button Sampler Piano Using the Adafruit Wave Shield and Massive Arcade Buttons!

Søren Andreasen used the Adafruit Wave Shield to create this excellent 12 Button Sampler project, getting help with hardware and code on the Adafruit Forums:

I have made two x 12 button samplers with lamps in each button. They both run on an Arduino UNO R3 with a Waveshield 1.1. My power supply is 12 1,5v AA batteries in series (for 12 lamps), and there’s an lc809cv voltage regulator that powers the Arduino. On the I2C bus i have an mcp23016 IO expander that turns on some of the lamps while also has some of the button inputs.

All the arduino pins that aren’t used by the waveshield, are being used for either button inputs or outputs for triggering transistors to turn on/off lamps. that means i’m using pin 0, 1, 6, 7, 8, 9, 15, 16 and 17 (the last three are analog pins initialized as IO’s).

On one of the devices, all buttons are going through a resistor ladder into an analog pin where they are being read. The sketch then descides which button is being pushed depending on the voltage reading.

On the other device, I have used all IO’s on the mcp in order to give each button its own IO. Both setups work fine, and there are no difference in the amount of distortion on the two devices, so I don’t think this has anything to say.

I ordered 4 wave shields to have enough, and so far I’ve built 3 of them. Now I just tested the one that I haven’t used for these devices yet, and you know what: it’s not distorting!!! …

Read more.

Sample machines cover

Device 1 overview 1

Device 2 overview

Featured Adafruit Product


Adafruit Wave Shield for Arduino Kit – v1.1: Adding quality audio to an electronic project is surprisingly difficult. Here is a shield for Arduinos that solves this problem. It can play up to 22KHz, 12bit uncompressed audio files of any length. It’s low cost, available as an easy-to-make kit. It has an onboard DAC, filter and op-amp for high quality output. Audio files are read off of an SD/MMC card, which are available at nearly any store. Volume can be controlled with the onboard thumbwheel potentiometer. This shield is a kit, and comes with all parts you need to build it. (read more)

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Join 35,000+ makers on Adafruit’s Discord channels and be part of the community!

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more

CircuitPython – The easiest way to program microcontrollers –

Maker Business — Chip inventories rise as demand falls

Wearables — How to attach a battery to your next wearables project

Electronics — Check out this shorthand shortcut

Python for Microcontrollers — Python on Microcontrollers Newsletter: 400 CircuitPython Libraries, 3m Thanks and much more! #CircuitPython #Python @ThePSF @micropython @Raspberry_Pi

Adafruit IoT Monthly — 2022 in Recap!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — #NewProducts 1/25/23 Featuring #Adafruit ESP32-S2 Reverse #TFT Feather! @adafruit

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at !

No Comments

No comments yet.

Sorry, the comment form is closed at this time.