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All About Batteries
Everything you ever wanted to know about batteries!
This article is about batteries (if you couldn't tell) - and how to decide which batteries will run your project best! I'll cover both rechargable and "one shot" batteries, trying to cover everything I've learned.
Stereo 3.7W Class D Audio Amplifier
These go to eleven!
Add some big sound to your next project. Boost he output of your Wave Shield or build yourself a portable sound system for your iPod or mp3 player.
MCP4725 12-Bit DAC Tutorial
Add an analog output to your microcontroller
Your microcontroller probably has an ADC (analog -> digital converter) but does it have a DAC (digital -> analog converter)??? Now it can! This breakout board features the easy-to-use MCP4725 12-bit DAC. Control it via I2C and send it the value you want it to output, and the VOUT pin will have it. Great for audio / analog projects, such as when you can't use PWM but need a sine wave or adjustable bias point.
Mini Thermal Receipt Printer
Print receipt paper from a little printer
Add a mini printer to any microcontroller project with this very cute thermal printer. Also known as receipt printers, they’re what you get when you go to the ATM or grocery store. Print text, barcodes, bitmap graphics, even a QR code!
Li-Ion & LiPoly Batteries
All about the power packs that propel your projects!
If you want to take your project portable you'll need a battery pack! For beginners, we suggest alkaline batteries, such as the venerable AA or 9V cell, great for making into larger multi-battery packs, easy to find and carry plenty of charge. If you want to go rechargable to save money and avoid waste, NiMH batteries can often replace alkalines. Eventually, however you may want to upgrade to the shiniest new technology - rechargable lithium ion/polymer batteries. In this guide you will learn all about these batteries, and how to properly use them in your projects.
Power Supplies
Power in, power out!
A power supply is a device that supplies power to another device, at a specific voltage level, voltage type and current level. While it sounds simple, power supplies have a lot of little hang-ups that can be very tricky for the uninitiated. This tutorial will try to help explain all about power supplies.
FLORA TV-B-Gone
A tiny television neutralizer
The most wearable TV-B-Gone yet! Use freehand wiring with solder to whip up this pin capable of shutting off most television sets. Craft your own fabric ornament to match any outfit.
USB NeXT Keyboard with an Arduino Micro
Get out your 10 lb keyboards!
Ladyada and pt had an old NeXT keyboard with a strong desire to get it running on a modern computer. These keyboards are durable, super clicky, and very satisfying to use! We spent a few days and with a little research we got it working perfectly using an Arduino Micro as the go between. Now this lovely black deck works like any other USB keyboard. Sure it weighs more than our Macbook, but its worth it!
TIMESQUARE Watch Kit
Show up stylish AND on time to any event with this awesome looking DIY watch.
Show up stylish AND on time to any event with this awesome looking DIY watch. Build your own fashionable time piece, with multiple watch 'faces' and a bright 8x8 matrix display
Tiny Arduino Music Visualizer
Maximum blinkenlights, minimum effort!
This easy project combines an Arduino with our microphone amplifier and bicolor LED matrix to create a music visualizer that responds to ambient sound.
Wave Shield Voice Changer
Speak like everyone's favorite baritone Sith lord or sing along with the Lollipop Guild!
Like a fine wine, open source projects improve with age. We've taught this classic shield a new trick: a realtime voice changer!
LED Bicycle Handlebars
Super bright onboard lights
Add a strip of LEDs to your bicycle handlebars for extra visibility and fun at night. This easy project requires only a few parts and very little soldering.

About Adafruit

Adafruit was founded in 2005 by MIT engineer, Limor "Ladyada" Fried. Her goal was to create the best place online for learning electronics and making the best designed products for makers of all ages and skill levels.
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The Adafruit Learning System

In 2012, after years of coding tutorials by hand, Limor put together a small team to build a custom tutorial management system from the ground up. The Adafruit Learning System allows us to make a wide range of awesome tutorials fast and efficiently. We hope these tutorials will help you learn something new, and inspire you to make something great!

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