12_LED_Chase_with_BUTTON

/*
 * 30th December 2020
 * Original code by https://www.baldengineer.com/arduino-chasing-leds-with-millis.html
 *
 * Modified by (Ralph McCleery) https://www.facebook.com/macca448/
 * My changes are: #1 increased LED count to 10,
 *                 #2 The PIN map is for an ESP8266 Dev board
 *                 #3 defined PIN number,
 *                 #4 Invers the effect on 4 count
 */
#include "OneButton.h"
// Simple macros to remember which direction to shift LEDs
#define UP true
#define DOWN false
#define led_count 12
OneButton button(14, true);
// Will be used to track how long since last event "fired"
unsigned long previousMillis=0;

// Delay to determine when we see the next LED
unsigned long interval = 75;

// Array with Arduino pins containing LEDs in sequence
byte LEDpins[led_count] = {
  //3,15,13,12,14,2,0,4,5,16 // This is a 10 LEDs ESP8266
  15,2,4,16,17,5,18,19,21,3,1,22}; // This is a 12 LEDs ESP32
byte runCount = 0;
byte runState = 0;

// Variable to track which LED to turn on, start at 000001
int LEDstate=0x00;

// State variable to know which direction to shift
boolean direction=UP;

void setup() {
  button.attachClick(singleclick);
  // Set Pins with LEDs to OUTPUT
  for (int x=0; x < led_count; x++){
    pinMode(LEDpins[x], OUTPUT);
  }
}
void singleclick(){
  runState = !runState;
    for(int x=0; x<led_count; x++){
      if(runState == HIGH){
        runCount = 8;
        LEDstate = 0x01;
      }else if(runState == LOW &&  runCount <= 3){
        LEDstate = 0x00;
      }else if(runState == LOW &&  runCount > 3){
        LEDstate = 0xFFF;
      }
    }
}

void loop() {
  button.tick();
  //The runCount is set to 4 loops then then inverse
  if(runCount > 7){
    runCount = 0;
  }
  // Set the pins of each LED during each iteration
  // You'll only see something change when "LEDpins" gets updated
  for (int x=0; x < led_count; x++)
  if(runCount <= 3){
    digitalWrite(LEDpins[x], bitRead(LEDstate,x));
  }else if(runCount > 3){
    digitalWrite(LEDpins[x], !bitRead(LEDstate,x));
  }

  if(runState == HIGH){
  // Get current time and determine how long since last check
  unsigned long currentMillis = millis();
  if ((unsigned long)(currentMillis - previousMillis) >= interval) {
    // We've waited "interval" amount of time, so let's do some stuff!

    // "Reset" our clock
    previousMillis = currentMillis;

    if (direction==UP) {
      // Use "<<" to "bit-shift" everything to the left once
      LEDstate = LEDstate << 1;
      // 0x20 is the "last" LED, another shift makes the value 0x40
      if (LEDstate == 0x1000) {
        // turn on the one before "0x20" and reverse direction. Originally 0x10
        LEDstate = 0x400;
        direction = DOWN;
      }
    }
    else {
      // use ">>" to "bit-shift" all bits in LEDstate once to the right
      LEDstate = LEDstate >> 1;
      // This means we ran out of bits!
      if (LEDstate == 0x00) {
        runCount = runCount +1;
        // set one ahead so no extra delay
        LEDstate = 0x02;
        direction = UP;
       }
    }
  }
 }
}