Esta atividade envolve somente prática com os diferentes tipos de variáveis, utilizando somente a saída serial da placa Uno para o monitor. Assista o
vídeo, simule os exemplos em Autodesk Circuits e finalmente implemente na prática.
Referências adicionais:
1.
Operadores booleanos
2.
Arduino language reference
3. Tipos de variáveis: (
Sparkfun)
- boolean (8 bit) - simple logical true/false
- byte (8 bit) - unsigned number from 0-255
- char (8 bit) - signed number from -128 to 127. The compiler will attempt to interpret this data type as a character in some circumstances, which may yield unexpected results
- unsigned char (8 bit) - same as ‘byte’; if this is what you’re after, you should use ‘byte’ instead, for reasons of clarity
- word (16 bit) - unsigned number from 0-65535
- unsigned int (16 bit)- the same as ‘word’. Use ‘word’ instead for clarity and brevity
- int (16 bit) - signed number from -32768 to 32767. This is most commonly what you see used for general purpose variables in Arduino example code provided with the IDE
- unsigned long (32 bit) - unsigned number from 0-4,294,967,295. The most common usage of this is to store the result of the
millis() function, which returns the number of milliseconds the current code has been running
- long (32 bit) - signed number from -2,147,483,648 to 2,147,483,647
- float (32 bit) - signed number from -3.4028235E38 to 3.4028235E38. Floating point on the Arduino is not native; the compiler has to jump through hoops to make it work. If you can avoid it, you should.
Um exemplo de código usado na simulação envolvendo diferentes tipos de dados:
int x;
int y;
int z;
boolean A;
boolean B;
void setup(){
Serial.begin(9600);
Serial.println("Eu sou o Arduino");
x = 2;
y = 33000;
z =-x+y;
Serial.print("x =");
Serial.print(x);
A = 0;
B = 1;
Serial.print(" y =");
Serial.print(y,BIN);
Serial.print(" z =");
Serial.println(z, BIN);
Serial.print("A AND B =");
Serial.println(A && B);
Serial.print("A OR B =");
Serial.println(A || B);
Serial.print("NOT(A OR B) AND B =");
Serial.println(!(A || B) && B);
}
void loop(){
}
Exercícios
1. Use variáveis booleanas no Arduino para determinar a
tabela-verdade para (AB+C)+B+A'C, onde a multiplicação representa o operador AND, a soma representa OR e A' significa NOT(A).
2. Escreva um programa no Arduíno no qual, dados A, B, C inteiros, ele verifica se a igualdade A^2+B^2=C^2 é satisfeita (ou seja, A,B, C formam uma tripla pitagórica), respondendo com "verdadeiro" ou "falso".
