https://www.sparkfun.com/tutorials
While I was looking for a simple way of testing LEDs, I came across this tutorial on making a cool tester. https://www.sparkfun.com/tutorials/376
But then I started to check out all their tutorials and they have a really nice selection. I am going to try and cut and paste all the different categories below.
Assembly and Quickstart Guides 65 in this category »
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Mono Audio Amplifier Quickstart Guide
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EL Wire Quickstart Guide
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Stepper Motor Quickstart Guide
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Flexiforce Pressure Sensor (25lbs) Quick Start Guide
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SparkFun Ethernet Shield Quickstart Guide
SparkFun Projects 84 in this category »
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Python and GPS Tracking
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Testing LEDs with fast-switching tweezers
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HAB Launch – S1
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Robot Journal – Michelle
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Robot Journal – Toni
General Explanation 16 in this category »
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LogicBlocks Experimenter’s Guide
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LogicBlocks & Digital Logic Introduction
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The FCC and Open Source Hardware
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Electric Imp: Serial communication between Imp and Arduino
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Digital Caliper Battery Hack
Surface Mount Soldering Tutorials 12 in this category »
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Making Your Own Solder Paste Stencils
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SMD How To – 3
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SMD How To – 8
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SMD How To – 6
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SMD How To – 2
E-Textiles 9 in this category »
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Twinkling Fairy Wings
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Using the LilyPad LilyTwinkle board
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ProtoSnap – E-sewing Kit: Getting Started Guide, Part 2
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Decorative Conductive Fabric Button
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Beginning LilyPad Arduino
Bite Sized Primers 8 in this category »
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Sizing a heat sink for a heavy load
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Number Systems
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LED Current Limiting Resistors
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Beginner Troubleshooting
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RS-232 vs. TTL Serial Communication
Print Ads 10 in this category »
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Dwight Eppinger, Interactive Marketing Director at Copper Mountain
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Jen Lewin, Creator of “The Pool”
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Jamie Robertson, Creator of the MP3 Trigger
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Steven Kennedy, SparkFun Enthusiast and High School Teacher
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Landon Cox, creator of an electronics-based speed climbing timer.
Beginning Embedded Electronics 11 in this category »
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Beginning Embedded Electronics – 7
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Beginning Embedded Electronics – 11
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Beginning Embedded Electronics – 10
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Beginning Embedded Electronics – 9
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Beginning Embedded Electronics – 5
General PIC Tutorials 8 in this category »
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MCP Upgrade tutorial
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Mini-ICSP Updates
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Serial IO
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The Biggie
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Basic breadboard tutorial
PIC Boot Loader 3 in this category »
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Bloader and Screamer
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Bloader and Screamer 877A
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Bloader for the 16F88
PIC Programmer Setup Tutorials 8 in this category »
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PG3B ICProg tutorial
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PG3B WinPicProg tutorial
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Setting up the MCP under MPLAB
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Setting up the In Circuit Debugger under MPLAB
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Programmer and Board Test Program