Difference between revisions of "AVR Microcontroller Class 2009"

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something else!
something else!
[Media: class3.pdf]
[[Media: class3.pdf]]
== Class 4: Interrupts and Timers ==
== Class 4: Interrupts and Timers ==

Revision as of 16:09, 29 September 2008

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

Class 0: Introduction and Setup

What the AVRs are, what all the pins do, what they can do for you. Then the toolchain: soldering together the programmer kits, getting the software up and running.

Labs: building the kit and running a test LED flasher. (Almost all lab today, little talk.)


Class 1: Programmer Hookup and Hello World LED Blinking

Lecture on how the programmer works -- simple serial interface basics. Some basics on avrdude / GCC tools. Hook up the programming interface wire-by-wire to the Mega48 chip and flash it with a simple program. The hook up an LED to the output port and watch it blink!


  • Wiring Diagram: Wiring.png


  • Your kit has 10 resistors and 10 LEDs. If you want, you can solder them together to make [AVR: LED Blinkenlights].
  • If you didn't already, make labels for the signal wires. Think of an easy way to remember which go where (into the 6-pin or 10-pin header). And/or make permanent programmer "pigtails" by soldering the signal wires to a 2x3 header in the correct orientation (headers available in the HacDC hackersmart for pennies).
  • Play around with the delays in the LED_Demo.c code. Make the blinking faster or slower. Experiment with on time and off time.

Class 2: Outputs: Bit Math, Cylon Eyes, and PWM Fading

How to make chips speak to the outside world, pin-by-pin. Enough C bitwise-math operations to make it work. Pulse-width modulation.

Labs: Visualizing bytes, Cylon eyes, and dimming LED's. Extra credit: cross-fading cylon eyes!



  • So you can make various lights blink and/or dim. Now what? Cross-fading cylon eyes? Patterns? Something groovy?
  • Note that you've got an 8-bit display if you're willing to read out numbers in binary. Useful for debugging later on, for sure. What else? Binary clock? Simple upcounter? Display "random" numbers?
  • If you could swing it around, you'd be on your way to a POV toy.

Class 3: Inputs: Buttons and Analog-to-Digital conversion (ADC)

Gather data from the world.

Labs: pushbutton organ, light-dependent theremin. Extra credit: something else!

Media: class3.pdf

Class 4: Interrupts and Timers

Interrupts call subroutines when certain conditions are true. Timers let you time stuff. Together, they take a lot of the programming burden off your shoulders, and enable really cool stuff.

Labs: Driving servo motors and/or build a better audio synth, use an LED as a light-source and light-sensor. Extra credit: capacitive touch-switch!

Class 5: Serial I/O

Make the micro speak to your computer (and vice-versa). We can also cover other serial protocols (I2C, SPI).

Labs: Basic serial in/out, data-logging light sensor. Maybe SD/MMC cards? Extra credit: ADC + serial output + Python + laptop = ghetto oscilloscope.