Building a Guitar Pedal Prototype with a Feather #Arduino #Feather #Music @sahazel

Black Light Unicorn are fans of the Adafruit Feather M4 Express microcontroller for its speed, good mix of features, and easy programming with Arduino tools. They thought: “Should we make a guitar pedal with it? Of course we should make a guitar pedal with it.” And they did.

The Teensy Audio Adaptor Board, with its SGTL5000 chip was the basis for sound. To make all the necessary connections for the Feather to control the SGTL5000, They mostly used I2S. They had some software issues with the I2C clock signals and submitted a pull request to get those fixed in the Adafruit’s ZeroI2S library.

All we needed now was a guitar effect. Some of the Audio library examples worked for us, but we wanted to start from scratch and make some effects from the ground up. So, we thought, what’s the simplest guitar effect? We figured tremolo is about as simple as it gets: just use an LFO to turn the volume up and down.

You can check out the code in the GitHub repo. Very briefly, here are the most interesting parts: tremolo.ino is where we connect up the I2S audio input, the tremolo effect, and the I2S output (using a mixer to make a depth control), and set up the volume, and the depth and speed of the tremolo.

See it in action and more in the post here.

Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here:

Join Adafruit on Mastodon

Adafruit is on Mastodon, join in!

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.

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!

Join over 36,000+ makers on Adafruit’s Discord channels and be part of the community!

CircuitPython – The easiest way to program microcontrollers –

Maker Business — Making sure the CHIPS act isn’t just crumbs

Wearables — Our little secret to weather-proofing your projects

Electronics — Meaningful gains

Python for Microcontrollers — Python on Microcontrollers Newsletter: New Thonny and Git Versions, Plenty of Projects and More! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — Guardian Robot, Weather-wise Umbrella Stand, and more!

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! — NEW PRODUCTS – CNC Rotary Encoder – 100 Pulses per Rotation – 60mm Black

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.