LED Gumball Machine
Contributors:
Nate
Nate 
Resources and Going Further
We hope you've enjoyed reading about our LED dispensing gumball machine. If you liked this one, there's tons more!
Logic Levels
Learn the difference between 3.3V and 5V devices and logic levels.
Getting Started with OBD-II
A general guide to the OBD-II protocols used for communication in automotive and industrial applications.
Raspberry gPIo
How to use either Python or C++ to drive the I/O lines on a Raspberry Pi.
How Does an FPGA Work?
The What, How, Why, and When of Field Programmable Gate Arrays, aka FPGAs
Accelerometer Basics
A quick introduction to accelerometers, how they work, and why they're used.
Hackers in Residence - Cosmic Ray Detector
Learn how to detect cosmic rays with this simple and cheap detector, built by Hacker in Residence Pete Marchetto.
ADXL345 Hookup Guide
Get started with the ADXL345 Accelerometer.
Build Your Own High-Concentration CO2 Detector
The SparkFun STC31 CO2 Sensor can accurately measure CO2 concentrations up to 100% with high repeatability and long-term stability, thanks to humidity and temperature compensation provided by the built-in SHTC3. This tutorial will show you how!