/
mux_4051_01.ino
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/
mux_4051_01.ino
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/* vim: set ft=c : */
/**
* Author: Leo Vidarte <http://nerdlabs.com.ar>
*
* This is free software:
* you can redistribute it and/or modify it
* under the terms of the GPL version 3
* as published by the Free Software Foundation.
*/
/**
* @see http://www.arduino.cc/playground/learning/4051
*
* Connect mux 4051 with pines s0, s1 and s2 on 2, 3 and 4 resp.
* Connect z to pin 7
*/
const int s0 = 10;
const int s1 = 11;
const int s2 = 12;
const int z = 13; // power
void setup() {
pinMode(s0, OUTPUT);
pinMode(s1, OUTPUT);
pinMode(s2, OUTPUT);
pinMode(z, OUTPUT);
randomSeed(analogRead(0));
}
void loop() {
// Knight Rider 1
for (int i = 0; i <= 7; i++) {
turn_on_led(i);
delay(100);
}
for (int i = 6; i >= 0; i--) {
turn_on_led(i);
delay(100);
}
// Knight Rider 2 (two leds)
int leds[][2] = {
{0, 7}, {1, 6}, {2, 5}, {3, 4}
};
for (int i = 0; i <= 3; i++) {
turn_on_leds(leds[i], 2, 5000);
}
for (int i = 2; i >= 0; i--) {
turn_on_leds(leds[i], 2, 5000);
}
// Three leds
int leds2[][3] = {
{0, 2, 4}, {1, 3, 5}, {2, 4, 6}, {3, 5, 7}
};
for (int i = 0; i < 4; i++) {
turn_on_leds(leds2[i], 3, 5000);
}
// Random led
int last = -1;
int next;
for (int i = 0; i < 20; i++) {
do {
next = random(8);
} while (next == last);
turn_on_led(next);
delay(100);
last = next;
}
}
void turn_on_led(int number) {
digitalWrite(z, LOW);
digitalWrite(s0, number & 0x01);
digitalWrite(s1, number & 0x02); // no need to shift ;)
digitalWrite(s2, number & 0x04); // idem
digitalWrite(z, HIGH);
}
void turn_on_leds(int leds[], int length, int times) {
for (int i = 0; i < times; i++) {
for (int j = 0; j < length; j++) {
turn_on_led(leds[j]);
}
}
}