Arduino : ทำไมเราควรใช้งาน #define

       
      ก็ตอนแรกตั้งใจจะเขียน แต่คิดอีกที ลองพูดดูดีกว่า ลองดูตามคลิปเลยครับ

Code ตัวอย่าง 

	//GoodWriting 1.1 Preprocessive director -> #define
	#include <stdint.h>
	///* <----- 1
	//740,9
	#define LED_1 7
	#define LED_2 6
	#define LED_3 5
	#define LED_4 4
	//*/
	/* <----- 2
	//774,13 (13 - 9 = 4, 4/4 = 1)
	uint8_t LED_1 = 7;
	uint8_t LED_2 = 6;
	uint8_t LED_3 = 5;
	uint8_t LED_4 = 4;
	//*/
	/* <----- 3
	//778,17 (17-9 = 8, 8/4 = 2)
	int LED_1 = 7;
	int LED_2 = 6;
	int LED_3 = 5;
	int LED_4 = 4;
	//*/
	/* <----- 4
	//786,25 (25-9 = 16, 16/4 = 4)
	long LED_1 = 7;
	long LED_2 = 6;
	long LED_3 = 5;
	long LED_4 = 4;
	//*/
	void setup() {
	}
	void loop()
	{
	digitalWrite(LED_1,HIGH);
	digitalWrite(LED_2,HIGH);
	digitalWrite(LED_3,HIGH);
	digitalWrite(LED_4,HIGH);
	}

view raw GoodWriting_1_1.c hosted with ❤ by GitHub

	#include <stdint.h>
	#define _DEBUG_
	#define LED_1 7
	#define LED_2 6
	#define LED_3 5
	#define LED_4 4
	void setup()
	{
	#ifdef _DEBUG_
	Serial.begin(115200);
	Serial.println("Hello, World.");
	#endif
	}
	void loop()
	{
	static uint8_t tg = 0;
	if(tg == 0)
	{
	digitalWrite(LED_1,HIGH);
	digitalWrite(LED_2,HIGH);
	digitalWrite(LED_3,HIGH);
	digitalWrite(LED_4,HIGH);
	#ifdef _DEBUG_
	Serial.println("All LED on !");
	#endif
	}
	else
	{
	digitalWrite(LED_1,LOW);
	digitalWrite(LED_2,LOW);
	digitalWrite(LED_3,LOW);
	digitalWrite(LED_4,LOW);
	#ifdef _DEBUG_
	Serial.println("All LED off !");
	#endif
	}
	delay(1000);
	}

view raw GoodWriting_1_2.c hosted with ❤ by GitHub