Foamyguy Notes

Foamyguy
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Getting Started

Adafruit Playground is a wonderful and safe place to share your interests with Adafruit's vibrant community of makers and doers. Have a cool project you are working on? Have a bit of code that you think others will find useful? Want to show off your electronics workbench? You have come to the right place.

The goal of Adafruit Playground is to make it as simple as possible to share your work. On the Adafruit Playground users can create Notes. A note is a single-page space where you can document your topic using Adafruit's easy-to-use editor. Notes are like Guides on the Adafruit Learning System but guides are high-fidelity content curated and maintained by Adafuit. Notes are whatever you want them to be. Have fun and be kind.

Click here to learn more about Adafruit Playground and how to get started.

  • By Foamyguy

    Macropad USB Audio Digital Effects Pedal

    This project turns your Macropad into a digital effects pedal. It takes in audio via USB. It can apply up to 4 effects using various audio effect core modules in CircuitPython. Finally, it outputs the modified audio back over USB to a computer. The Macropad presents as both a USB Speaker and Microphone to the computer so that computer audio can go in, get modified, and then come back out of the Macropad.

    Code

    The project requires two code files: code.py and boot.py.

    Adafruit Macropad overlayed with labels for 4 effects, one per row of keys.
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  • By Foamyguy

    USB Cipher Machine

    Historically it's been common for militaries to use purpose built mechanical cipher machines like the well known Enigma Machine, or the more mundanely named M-209. Ever since I learned about these devices they fascinated me. This project is a small toy cipher device inspired by them albeit made with a microcontroller instead of mechanical parts and pieces. 

    I showed this project on Show & Tell, the video is embedded below.

    Hardware

    Fizz Buzz cipher machine showing the clear text message "python"
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  • By Foamyguy

    Storing & Graphing IoT Data With PostgREST

    Overview

    This page aims to illustrate and document how you can use PostgreSQL and PostgREST to store and access data generated by sensors connected to micro-controllers or other IoT devices. Before we dive in, I'll introduce the projects and utilities that we'll be using:

    • PostgreSQL - A widely used, open source database system. It's very extensible and has many plugs and other utilities built "on top" of it. Client applications connect to it via a network port and send SQL commands to create, read, update, and delete data.
    • PostgREST - A standalone web server that turns your PostgreSQL database directly into a RESTful API. The structural constraints and permissions in the database determine the API endpoints and operations. This web server allows us to create, update and access our data with HTTP requests from micro-controllers and other endpoints.
    • NGINX - A widely used web server with reverse proxy, load balancing, and many other capabilities. This project will use it to host static HTML and JS files that can be viewed in a browser. It is good practice to use Apache or NGINX as a reverse proxy "in front" of other web server utilities like PostgREST.
    • ApexCharts - A Javascript library for making charts and graphs. We'll use this to graph data that we read out of our database.

    Setup PostgreSQL

    Method 1: Docker

    The official PostgREST tutorial skips the full PostgreSQL setup opting instead for a quick / easy setup running inside of a Docker container. If you already have or are familiar with Docker then this route is quite straight forward. The following command will create and launch a PSQL container:

     

    jwt_io_screenshot.png
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  • inkscape_select_all_icons.png
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Getting Started

Adafruit Playground is a wonderful and safe place to share your interests with Adafruit's vibrant community of makers and doers. Have a cool project you are working on? Have a bit of code that you think others will find useful? Want to show off your electronics workbench? You have come to the right place.

The goal of Adafruit Playground is to make it as simple as possible to share your work. On the Adafruit Playground users can create Notes. A note is a single-page space where you can document your topic using Adafruit's easy-to-use editor. Notes are like Guides on the Adafruit Learning System but guides are high-fidelity content curated and maintained by Adafuit. Notes are whatever you want them to be. Have fun and be kind.

Click here to learn more about Adafruit Playground and how to get started.