For loops??

Using Arduino Programming Questions
27

Here is the explanation:

  • MB_HIGH and MB_LOW are pretty obvious. They keep the LED on or off for the specified time.
  • MB_LOOP makes the pattern loop back to the nominated array element in the pattern for the specificed number of times.

So the data

  { 3, 0, 0, {{MB_HIGH, 25, 0}, {MB_LOW, 25, 0}, {MB_LOOP, 3, 0}, {MB_LOW, 300, 0}}, 0 },

does this:
0 LED on for 25 ms
1 LED off for 25 ms
2 Loop back to element 0 and repeat it 2 more time (3 total)
3 LED off for 300 ms - this is just a delay while the 'other' LED does its thing

So if we want to have a paired LED that works in tandem with this one we need to have the logic
0 LED off for 300 ms - this is just a delay while the 'other' LED does its thing
1 LED on for 25 ms
2 LED off for 25 ms
3 Loop back to element 1 and repeat it 2 more time (3 total)

which provides to table entry

  { 4, 0, 0, {{MB_LOW, 300, 0}, {MB_HIGH, 25, 0}, {MB_LOW, 25, 0}, {MB_LOOP, 3, 1}}, 0 },

So if we look at them as a pair:

  { 3, 0, 0, {{MB_HIGH, 25, 0}, {MB_LOW, 25, 0}, {MB_LOOP, 3, 0}, {MB_LOW, 300, 0}}, 0 },
  { 4, 0, 0, {{MB_LOW, 300, 0}, {MB_HIGH, 25, 0}, {MB_LOW, 25, 0}, {MB_LOOP, 3, 1}}, 0 },

You can see that the second MB_LOOP (pin 4) is in a different spot in the sequence and it loops back to a different place in the array. That is because we need to add the initial delay to the second LED while the sequence for pin 3 is executing.