Arduino Blink LED Tutorial
by Lewis Loflin
The Arduino test program 'blink' uses 580 bytes. The video discusses alternative programming methods to make better use of resources.
/* DDR - data direction register 0 = INPUT; 1 = OUTPUT PORTB - port B data register 0 = 0V; 1 = 5V 0b00000000 PB7 to PB0 PB0 = DP8 PB1 = DP9 PB2 = DP10 PB3 = DP11 PB4 = DP12 PB5 = DP13 PB6 & PB7 = crystal */
#define L1 9 // DP9 or PB1 // empty setup and loop 450 bytes void setup() { // DDRB = DDRB | 0b00000010; // 2 bytes // DDRB = 0b00000010; // 4 bytes // DDRB = 2; // same as above 4 bytes // pinMode(L1, OUTPUT); // 180 bytes // OUTPUT = 1, INPUT = 0 // pinMode(L1, 1); // 180 bytes } byte num = 0; // 8-bit unsigned 0-255 void loop() { // num = num ^ 1; // 12 bytes // num = !num; // 14 bytes // PORTB = PORTB ^ 0b00000010; // 8 bytes // PORTB = PORTB ^ 2; // 8 bytes // read IO register directly // num = digitalRead(L1); // num = !num // num = digitalRead(L1) ^ 1; // num = !digitalRead(L1); // digitalWrite(L1, num); // 268 bytes once // digitalWrite(L1, num = !num); // 278 bytes // delay(500); // 162 bytes once // myDelay(500); // 64 bytes once // digitalWrite(L1, num); // 10 bytes // delay(500); // 12 bytes // myDelay(500); // 8 bytes } // x * 1mS delay 64 bytes // unsigned int 2 bytes // 2^16 - 1 = 65,535 // unsigned long 4 bytes // 2^32 - 1 = 4,294,967,295 // milliSec. delay 64 bytes void myDelay(unsigned int x) { for (unsigned int y = 0; y <= x; y++) { delayMicroseconds(1000); } }
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