Code examples for the book "Make: AVR Programming"
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AVR-Programming-Library added prototype for nibbleToHexCharacter() Mar 23, 2016
Chapter02_Programming-AVRs bug fix: one missing zero in blink.c code Mar 25, 2017
Chapter03_Digital-Output change return (0); to return 0; May 20, 2016
Chapter04_Bit-Twiddling change return (0); to return 0; May 20, 2016
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Chapter06_Digital-Input change return (0); to return 0; May 20, 2016
Chapter07_Analog-to-Digital-Conversion-I change return (0); to return 0; May 20, 2016
Chapter08_Hardware-Interrupts change return (0); to return 0; May 20, 2016
Chapter09_Introduction-to-Timer-Counter-Hardware change return (0); to return 0; May 20, 2016
Chapter10_Pulse-Width-Modulation change return (0); to return 0; May 20, 2016
Chapter11_Driving-Servo-Motors change return (0); to return 0; May 20, 2016
Chapter12_Analog-to-Digital-Conversion-II change return (0); to return 0; May 20, 2016
Chapter13_Advanced-PWM-Tricks change return (0); to return 0; May 20, 2016
Chapter14_Switches/dcMotorWorkout change return (0); to return 0; May 20, 2016
Chapter15_Advanced-Motors change return (0); to return 0; May 20, 2016
Chapter16_SPI/spiEEPROMDemo change return (0); to return 0; May 20, 2016
Chapter17_I2C change return (0); to return 0; May 20, 2016
Chapter18_Using-Flash-Program-Memory change return (0); to return 0; May 20, 2016
Chapter19_EEPROM change return (0); to return 0; May 20, 2016
avrdude_utilities adding avrdude 6.1 and some utilities for Windows Feb 14, 2015
setupProject Changed project-specific Makefiles to be generic Feb 18, 2015
LICENSE.txt finally added license Mar 23, 2016 added link to first book reference Jan 27, 2014
allProjectsList updated project list to match current state Feb 18, 2015

Code and Examples from "Make: AVR Programming"


Here you'll find all the code (and more!) for the Maker Media book Make: AVR Programming.

Getting Started

  • First, download the contents of this repository onto your hard-drive. The easiest way is with the "Download ZIP" button above and on the right-hand side of this very web page. Extract the zip file wherever is comfy. (Feel free to clone the repo if you are comfortable with Git.)

  • Most of the projects share a common set of pin defines and a common simple USART serial library in the AVR-Programming-Library directory. The makefiles I've included depend on the directory structure here by default, so don't go moving the folders around unless you also change the path to included files in the makefile.

  • If you're using the Arduino IDE, you'll want to copy the AVR-Programming-Library directory into your sketchbook/libraries folder. If you don't know where this is, you can find out in the "File...Settings" dialog within Arduino. Now you can link your code to use this library simply using "Sketch...Import Library" and selecting the library from the the menu.

  • Now you will be set to open the code, edit it, and flash it into the AVR following the directions in the book.

Repo Layout

All of the project code is organized by the chapters in the book. So if you're looking for an example of some SPI code, see the "Chapter16_SPI" folder for SPI-related projects. That's obvious.

But a bunch of the projects are interesting in addition to the topic covered in the chapter. For instance, "Chapter05_Serial-IO" includes a project that uses the serial communication between your desktop computer and the AVR to turn your computer keyboard into a musical keyboard that plays notes generated on the AVR, turning it into a serial-port-controlled organ. You wouldn't think to go looking in the Serial I/O chapter unles you were following along in the book.

So for an overview all the projects, the file allProjectsList lists them all out by name.


If you'd like a blank template to start writing your own AVR code, have a look in the setupProject directory that I've included here. Inside, you'll find main.c and main.h files that are essentially blank and ready to go. main.c makes use of my simple USART library, which is also included an linked in by the Makefile. In short, you could copy this directory, rename files, and start using it in your own projects.

But you don't have to do that manually. Running python myProjectName will create a directory called myProjectName for you, copy the blank main files, renaming them as appropriate, and set up the Makefile accordingly. All that's left for you to do is the hard part -- actually coding.

If you use this setup a lot, you'll want to personalize the Makefile and the two main files to suit your own preferences. That way, whenever you start up a new project, it'll include a customized Makefile that has your programmer, chip type, and favorite baud rate already set.

Finally, if you like to map out your pin definitions in macro definitions, run python The program will ask you what you'd like to call each pin macro (e.g. "LED0") and then which pin on the AVR you'd like to associate with it (e.g. "PB1"). When you're done entering your pin layout, it'll create a "pinDefines.h" file with (I hope) nicely-named macros. Move this file into the right directory, and include it in your code. Calling LED0_SET_HIGH will turn your LED on.


You've read the book, you've built the projects, you've worked through the code. But still you hunger for more projects, more examples, more, more, more! If I may toot my own horn, you should visit where I blog about whatever microcontroller projects I'm currently up to.

In particular, if you're reading Make: AVR Programming, and you're interested in fully-elaborated versions of the projects with more photos, videos, and explanation than could fit in a book, head on over to's AVR-Programming Section.

Once you've exhausted all of these resources, you should definitely head over to The Cornell University ECE 4760 Final Projects list page. It's an awe-inspiring collection of applications, and sure to spark some creative thoughts. It's all well-documented and there's tons of source code in C. [Professor Land's links section] ( is also top-notch, and his lectures on YouTube are also worth a look if you're getting serious about this whole AVR deal.