LoL Shield: first own sketch

Next in LoL Shield history: a sort of "growth simulation":

1. Place a particle (say: light a LED) at a random place on the shield.
2. start a new particle at (0, 0).
3. move this particle randomly; north, south, east or west.
4. if the particle hits a placed one, fix it at its last free place.
5. repeat from 2. until (0, 0) is occupied.
6. then blink the result, clear the screen and start at 1.

If the movement crosses a border then move to the other side. Mathematically spoken: we are on a torus.

First a short video (sorry for the poor quality - it seems that google reduces quality extremely):

And here is the sketch:

/*  growth01 - simulating a sort of growth.
 *
 *  23 Jan 2013   danimath   created
 *
 **********************************************************************/

#include 
boolean used [14][9];      // array of "used" points
int     x, y;              // actual point
int     xold, yold;        // last point

const int BLINKNUM   =  10; // number of blinks
const int BLINKDELAY = 300; // ms; blink speed
const int MOVEDELAY  =  50; // ms; move speed

/* ****************************************************************** */
void setup ()
{
    LedSign::Init ();
    randomSeed (analogRead(0));
    for (int j = 0;   j < 14;   j++)
    {
        for (int k = 0;   k < 9;   k++)
        {
            used [j][k] = false;
        }
    }
    x = random (14);
    y = random (9);
    LedSign::Set (x, y, 1);
    used [x][y] = true;
    x = y = 0;
}

/* ****************************************************************** */

void loop ()
{
    int dir = random (4);
/*
 *  1. light my fire
 *  ================
 */
    for (int j = 0;   j < 14;   j++)
    {
        for (int k = 0;   k < 9;   k++)
        {
                LedSign::Set (j, k, used [j][k]);
        }
    }
/*
 *  2. get next point
 *  =================
 */
    xold = x;
    yold = y;
    switch (dir)
    {
        case 0:
            x--;
            if (x < 0) x = 13;
            break;
        case 1:
            x++;
            if (x > 13) x = 0;
            break;
        case 2:
            y--;
            if (y < 0) y = 8;
            break;
        case 3:
            y++;
            if (y > 8) y = 0;
            break;
    }
/*
 *  3. check, if used
 *  =================
 */
    if (used [x][y])
    {
        used [xold][yold] = true;
        for (int j = 0;   j < BLINKNUM;   j++)
        {
            LedSign::Set (0, 0, 0);
            LedSign::Set (xold, yold, 0);
            delay (MOVEDELAY);
            LedSign::Set (0, 0, 1);
            LedSign::Set (xold, yold, 1);
            delay (MOVEDELAY);
        }
        x = y = 0;
    }
    LedSign::Set (x, y, 1);
    delay (MOVEDELAY);
/*
 *  4. nothing more possible
 *  ========================
 */
    if (used [0][0])
    {
/*
 *      4.1. blink result
 *      -----------------
 */
        for (int i = 0;   i < BLINKNUM;   i++)
        {
            LedSign::Clear (0);
            delay (BLINKDELAY);
            for (int j = 0;   j < 14;   j++)
            {
                for (int k = 0;   k < 9;   k++)
                {
                    LedSign::Set (j, k, used [j][k]);
                }
            }
            delay (3 * BLINKDELAY);
        }
/*
 *      4.2. clear all
 *      --------------
 */
        for (int j = 0;   j < 14;   j++)
        {
            for (int k = 0;   k < 9;   k++)
            {
                used [j][k] = false;
            }
        }
        x = random (14);
        y = random (9);
        LedSign::Set (x, y, 1);
        used [x][y] = true;
        x = y = 0;
    }
}

LoL Shield assembly

For a long time I'm addicted to blinking LEDs, so it was only natural to buy a LoL Shield by Jimmie P. Rogers. I ordered it at Watterott and - as usual - they delivered very quickly. With trembling hands I unpacked the parts - and decided to wait until tremor disappeared. After reading some descriptions of the assembly and watching this recommendable video from Super Awesome Sylvia. I started to solder the 126 LEDs; a good exercise.

Unfortunately all instructions handle 3 mm LEDs; and there is a pitfall with 5 mm LEDs:
the instructions recommend to solder the headers last, and so did I. But two headers (for the digital pins) have to be soldered between the LEDs:

This was a little bit difficult. Thus I recommend to solder the inner headers first and work with the LEDs from this point. Finally solder the headers at the edge (the analogue ones).

Finally I noticed that the solder joints were so high, that they contacted the USB port of the Arduino, so I used a proto shield as a spacer.

Here is a view of the result:

Next I started the example sketches. They worked rather good, but I had some "ghost LEDs" when LED 42 was lit. I suspected a cold soldering spot, so I re-soldered the LED. Everything was fine - for five minutes, then the ghost LEDs reappeared. Fortunately there were six spare LEDs, and I replaced LED 42. Then everything worked fine.

Next I tried the fonttest example, but this did not work. It seems that there is a bug in the library, so that it does not work wit IDE 1.0.1. Lots of research to do.

The second steampunk inspired USB stick

Now it's time for the second USB stick to be changed into a steampunk stick:

A close-up of the cooling system:

The back side:

A close-up of the little foot:

And finally the stick at work:

The glass lens is a light blue one, but the red LED of the stick is strong enough to outshine this.

Steampunk inspired USB stick, continued

The first version looked a little bit simple to me; and it rolled every now and then over the desk. So there had to be installed some additions:

This is the result. The pipes are needed, because due to the incredible information density of my documents the stick got too hot ;-)))

And here are some details:

Steampunk inspired USB stick

Now that I've got addicted to steampunk I've built my first device - a USB stick made from copper:

It seems that it needs still some pipes and wires!

R.I.P. Niel Armstrong

Sad to read, that he passed away Aug 25 2012.

NASA link

LED bar shield, Part II

F... I've pimped the LED bar shield with a second shift register, but there seems to be a bug with the soldering. The LED bar shows the first pattern, and nothing more happens.