(Yes, the ending dash is supposed to be there.)
A Blue Box design that emulates classic Blue Box tones, plus 12 other historical tone modes. It produces 12 tone signalling systems used by phone phreaks to hack other more exotic system in the US and overseas, including early pre-cellular mobile telephone systems from the 50s, 60s, and 70s, including the classic bluebox and the DTMF suite. 12 memories of up to 32 tone sequences each. Sine waves from PWM.
Maybe make myself a con badge out of it?
This repository contains helpful resources to receive signals transmitted from an Arduino 433 MHz transmitter with an RTL-SDR receiver using GNU Radio.
The project consists of two parts. In the first part, we reverse-engineer the protocol. In the second part, we implement a real-time receiver.
A company that makes lots of specialized shields and hats for the RasPi and Arduino. Antennae, cellular radios, IoT modules, sensors, feedlines, connectors, adapters, and kits.
A directory of known Arduino shields.
A cheatsheet for the most popular microcontroller chips' pinouts, connection headers, and cable pinouts.
How to rig an Arduino up to play a simple melody through a piezo speaker.
Fritzing is an open-source graphical application for converting a project prototyped with an Arduino into a PCB schematic for manufacture. Designed for people already familiar with Processing to do what they need to do easily. Cross platform: runs on Windows, OSX, and Linux.
A CC-licensed cheatsheet for building with and programming the Arduino.
A massive list of free-as-in-beer ebooks about programming: Languages, platforms, tools, and more. Ideal for teaching classes, continuing education, reference, and getting a jump start on programming in school.
Homepage of a kit that emulates an Altair 8080 system using an Arduino.
An /*duino/i shield which emulates an MOS 6581... the SID chip.
An open source DIY robotics/rapid prototyping kit much like an Erector set. Lots of standardized pre-milled bars, rods, connectors, and components. Build your own plotter, CNC machine, RepRap, scanner table, or what have you. Capable of three axes of linear motion. Comes with all the electronics you need, including an Arduino, stepper motors, and a motor driver board.
Plans for constructing an Arduino shield which lets you stack another Atmega 126 or 328 in master/slave configuration. Double the I/O pins, double the interrupts.