Schema of the PINs
For me the entry point of the document,
from which I tried to understand the different functions available on each PIN

Table of the alternate functions for PIN PB[0,3]

Table of the alternate functions for PIN PA[0,7]

Here is my understanding of the different functions:
- ADC0 to ADC7: Analogic to Digital Converter, channels 0 to 7, INPUTS. It allows us to connect Analogic external periphericals to the MCU. Available on PIN PA[0,7].
- PCINT0 to PCINT11: Pin Change INTerrupt 0, sources 0 to 11. It allows us to generate an INTerrupt from an external peripherical. Available on PIN PA[0,7] and PB[0,3].
- INT0 and RESET: INT0 is an Internal INTerrupt, with highest priority than PCINT[0,11]. RESET is the top priority INTerrupt, with highest priority than INT0.
- XTAL1 and XTAL2: It allows us to connect either a quartz crystal or a ceramic resonator to the MCU (INPUT and OUTPUT), if connected then it will be used as the On-chip Oscillator.
- CLKI: It allows to connect an External Clock
- WRITING IN PROGRESS .........

Schema of the relations (workflows) between the different functions/features

Some definition I found on Internet:
- Interrupt
INTerrupt Wikipedia definition
- PWM: Pulse Width Modulator
PWM Wikipedia definition
- Other definitions coming soon ...

Installing Arduino IDE
And launching it

My Arduino Starter Kit from funduino.de
a good package to start programing

My first working program:
switch on/off the onboard led of the Arduino Uno

Here is the simple program that does it work

Then I needed to use the Breadboard to go further
But what is a Breadboard? Here is the tutorial I read

A more complex circuit
using 3 external leds: Blue/White/Red (FR flag colors)

Here is the related program (first version)

Here is the related program (2nd version)
after optimizations (using variables at starting, adding comments)

A new circuit with a button to switch ON the leds

Here is the related program
including the IF/THEN/ELSE condition on the button state

In arduino we need to install additional boards for AT Tiny
by specifying URL

Then in the Board Manager
we have to install the AT Tiny package

Now we install the ArduinoISP program to Arduino Uno
to use it as a ISP programmer

wire connections on Hello-World Board side

wire connections on Arduino Uno side

Burn Bootloader with the good settings
on the AT Tiny

Selecting the good Board/Processor/Clock/Port/Programmer

First Sketch: blink on the Hello-World board
Uploaded Using Programmer

Second Sketch: button to led on the Hello-World board
Uploaded Using Programmer

My FabISP connected to my Hello Board

Using the FabISP as a programmer inside Arduino IDE.
Some modifications were required inside file /Applications/Arduino.app/Contents/Java/hardware/arduino/avr/programmers.txt in order to recognize my FabISP inside Arduino IDE.

Then burning my board (ATtiny44, 1Mhz internal) using my FabISP
First trying to apply same programs as I did in last June, but IT DID NOT WORK!
I imagined that it can be related to my Hello Board, so I need to redo it from scratch!
In the same time, in the interval I did a lot of changes:
- I updated avrdude version to finalize my FabISP (it was one of my last tasks in previous round)
- I just updated version of Arduino IDE
- I updated version of AT core librairies
So finally decided to switch to Input Devices todo, and come back to this topic later

After working on Input Device, during when I discovered issues with standard Arduino IDE command (support for ATtiny)
I came back to the Hello Board, and tried to program it with avr/io library (see week 11 2nd round for more details)
I also found interesting code from some Niel's programms, like in this one And results were better ;-)

Here is the Blink Led programm.
See program in the ouputs at the top of the page.
See following video...

Using the same library.
Here is the Press Button programm
See program in the ouputs at the top of the page.
See following video...