ajuda com exercícios básicos

Boas pessoal,

Eu estou a procura de alguma ajuda para resolver uns exercícios de arduino para a escola. Pois so me falta a disciplina de microprocessador para finalizar o curso.. e como tal nos nessa disciplina temos um modulo que e aprender a programar o arduino!

Eu tenho aqui alguns exercicios que não conseui resolver, se alguem me conseguir ajudar a fazer e tentar meter nos comentarios uma breve explicação agradecia imenso.

Eu sei que quem domina arduino e a programação vão achar estes exercícios muito facil de fazer ...   

EX.1

Read potentiometer & show value in 7-

segment display

Read value from potentiometer (0-1023)

Display corresponding value (00-99) in 7-

segment display

Hints:

1) You have to convert a decimal value (0-99) into BCD.

Convert each digit at time. For example

• 75: you first convert 7 into BCD, then you convert 5 into BCD

2) To display 2X7-segments in the IDL800A you need to

“multiplex” the 7-seg display. For example

• 75: to display 7, you set the BCD code for 7, “activate” left 7-seg

display (cathode low), “deactivate” right 7-seg display (cathode

high) and wait sometime (about 10 ms)

• Then you set the BCD code for 5, “deactivate” left 7-seg display,

“activate” right 7-seg display and wait sometime (about 10ms)

EX.2

Count up/down:

Display number on 7 segments

• Start at 00

If push button A is pressed

• Count up

If push button B is pressed

• Count down

When the counter is at 99, and button A is

pressed, display must go to 00.

When the counter is at 00, and button B is

pressed, display must go to 99.

EX.3

Counter up and reset:

Display number on 7 segments

• Start at 00

Every second the counter goes up (do

NOT use the function delay())

If push button A is pressed counter is

reset, i.e. goes to 00 (use interrupts)

EX.4

Read potentiometer:

Read potentiometer

Use LEDs to display value of pot

LED 1: pot 1/8 max value

LED 2: pot 2/8 max value

LED 3: pot 3/8 max value

LED 4: pot 4/8 max value

LED 5: pot 5/8 max value

LED 6: pot 6/8 max value

LED 7: pot 7/8 max value

LED 8: pot equal max value

Obrigado pessoal