AVR Microcontroller Class 2011

Syllabus, course material, homeworks, photos, etc from an Introduction to Microcontrollers with AVR chips class can be found here.

Also see (and contribute to) Useful AVR Links For info about the kit: Avr2011_kit and Avr2011 Programming The Kit Or check out the old version of the course AVR Microcontroller Class 2009

Class 0: Introduction and Setup

Hello World!

Covers: What the AVRs are, what all the pins do, what they can do for you. A brief tour of the toolchain, and getting your firmware up and running on the chip. Reading the datasheets. How to make chips speak digital to the outside world, pin-by-pin. Just enough C programming link building service fundamentals to make it work.

Slides: Media:avr2011_class0.pdf

Lab: Building the kit and running a test LED flasher.

For assembly instructions and more details on the class kit, see Avr2011_kit. How to program the class kit, see Avr2011 Programming The Kit.

Demo Code: Media: LED_Demo.tgz

Homework: More soldering, and Cylon Eyes. Optional extra credit: Simple POV toy (hint, make the timing around 2ms between updates and swing your arms). Super bonus points: Make a neat POV toy.

OPC (Other People's Code):

Media: Pov demo.tar.gz An example POV toy. This contains 4 different patterns; two diamonds, a trapezoid and a smiley face. Also contains examples of using a character array to drive the POV toy, as well as use of constants to determine how the program runs. - Will

Resources:

• ATmega48P Datasheets (get both): ATmega48P Summary Datasheet and The Long ATmega48P Datasheet
• Bootloader appnote [1]
• Installing AVR Toolchain

Class 1: Digital and Serial I/O

Interfacing with the real world is the soul of microcontrolling.

Covers: Gathering simple data from the world, and learn how to spit it back out. A serial link with your computer enables all sorts of tricks, and enables the microcontroller version of printf debugging. Some boolean logic comes in handy here. Along the way, we'll learn a bunch about debouncing switches.

Slides: Media:avr2011_class1.pdf

Labs: More Cylon Eyes, All sorts of button-pressing demos, ASCII-to-binary keymapper, General-purpose serial LED display

Demo Code: Media: avr2011_class1_demoCode.tgz

HW: Ghetto logic probe and analyzer: read input on PORTC, display values on the LEDs, write out the value of PINC over serial, interpret/log/whatever using your laptop

OPC (Other People's Code): microTweeter a silly little program to interface twitter with a microcontroller. It is designed to post quotes from a file when a button is pressed on a microcontroller. This was done as learning experience with python, serial communications and social media integration. -Will G.

Resources:

• More than you ever wanted to know about debouncing: A Guide to Debouncing

Class 2: ADC and PWM: "Analog" I/O

Covers: Learn about ways to fake analog data into and out of your microcontroller. We'll learn how to switch logic states fast to emulate an analog output, and how to use the built-in analog-to-digital converters to measure the complex real-world.

Slides: Media:avr2011_class2.pdf

Demo Code: Media: avr2011_class2_demoCode.tgz

Labs: Dimming LEDs, light-level meter, ghetto oscilloscope

Homework: Auto-dimming LED or basic light-level data logger

Resources: You'll need to solder up the light sensors: [follow these directions]

Class 3: Interrupts

Covers: Interrupts call subroutines when certain conditions are true. They take a lot of the programming burden off your shoulders, enable the AVR to syncronize to external devices, and are great for super-fast response applications.

Slides: Media: avr2011_class3.pdf

Demo Code: Media: avr2011_externalInterrupt.tgz, Media: avr2011_serialInterrupt.tgz

Labs: Bunch of pushbutton interrupt routines, light/dark transition sensor, non-blocking serial I/O

Homework: Response-time-tester Game or "improved" interrupt-driven ghetto oscilloscope

Resources:

Class 4: Timers and Counters

Covers: Timers and counters let you time and count events! Up until now, we've been doing a lot with for loops and delays to count the passing of time. It's much easier and more precise to let the hardware do the timing. When you add interrupts and timers together, the world becomes your oyster!

Slides: Media: avr2011_class4.pdf

Demo Code: Media: avr2011_counterClock.tgz Media: avr2011_counterPWM.tgz

Labs:

Homework: Response-time-tester Game or tone generator

Class 5: Flash, EEPROM, I2C, USB, SD Cards, GPS, and Life After AVR Class

Covers: First, we'll cover using the internal flash memory and EEPROM for data storage. Then I'll demo how to use other people's code/libraries and tie it in to our packages, interfacing with all sorts of random devices for fun and profit. The final (optional) trick will be turning your classboard into a standalone AVR programmer so that you can program raw chips yourself, and outgrow the bootloader.

Labs:

Homework: