// Stranger Things Alphabet Wall
// From a Halloween Forum discussion:
// http://www.halloweenforum.com/halloween-props/152337-my-stranger-things-alphabet-wall.html
// Original code by Vater
// The Mokungit RGB addressable LEDs come with 50 pixels in the string, so this code
// has been set up to start the alphabet at the end of the string (pixel #50)
// with the LEDs winding back and forth on the wall.
// To convert this to a different number of LEDs, put together a diagram showing
// the layout and the pixel number of each letter. Change reference numbers in
// switch case section to match length and location of pixels in the strand.
// When you have the LEDs and letters on the wall, uncomment the "abcedefgh"
// and other messages below to check alignment with the letters. Then comment
// them back out when you're done.
// Updated 10/4/2016 to move "all on" and "flicker" effects into their own functions.
// This makes timing the entire effect easier, and restarts the whole effect each time
// all the messages have been shown. Also added test strings of letters.
// Updated 10/18/2016 to change type of LED, tweak colors, and increase brightness.
#include <FastLED.h>
#define DATA_PIN 6 // LED pin. Change this for your setup if needed.
template<typename T, size_t N> constexpr size_t countof(const T(&)[N]) { return N; }
// Set this to match the number LEDs in the string. Originally 50.
CRGB leds[50];
// Only a few colors
CRGB colors[] = {
// Orig set of colors
// 0xEEEEEE,
// 0xFFDD11,
// 0x00BBFF,
// 0xFF66FF
//red
0xFF0000, // Moved this up in the list so the PRNG would show red more.
//yellow
0xFFA500, // Better match to the show's screenshots
//blue
0x0000FF,
//aqua
0x00FFFF,
//white
0xFFFFFF,
//green
0x008000
};
uint8_t index[countof(leds)];
void setup() {
for (auto &color : colors) napplyGamma_video(color, 2.2);
for (auto &i : index) i = random8(countof(colors)); // Uses FastLED's randomizer
FastLED.addLeds<WS2811, DATA_PIN, RGB>(leds, countof(leds));
FastLED.setBrightness(255);
}
// The loop controls the main effect. Change pauses to get the timing you want.
void loop() {
LiteUp(); // Light up the strand of LEDs
delay(5000); // Wait five seconds
Flicker(); // Flicker them
delay(1500); // Wait 1.5 seconds before the first message is shown
// write("abcdefgh"); // Uncomment these to test your setup
// write("ijklmnop");
// write("qrstuvwxyz");
write("Help me "); // Change messages in quotes to whatever you want
delay(1000);
write("Im trapped");
delay(5000); // Wait five seconds after the last message before it starts again
}
int getIndex(char c) {
c = toUpperCase(c);
switch (c) {
// For 50-pixel strand
case 'A'...'H':
return 50 - (c - 'A');
case 'I'...'P':
return 30 + (c - 'I');
case 'Q':
return 39;
case 'R'...'Y':
return 26 - (c - 'R');
case 'Z':
return 17;
// For 30-pixel strand
// case 'A'...'H':
// return 30 - (c - 'A');
//
// case 'I'...'P':
// return 13 + (c - 'I');
//
// case 'Q'...'Z':
// return 10 - (c - 'R');
//
// default:
// return 0;
}
}
void write(char c) {
if (isAlpha(c)) {
// Get index and convert to 0-based indexing
int i = getIndex(c)-1; // (c)-2 gets to first pixel in strand if needed
leds[i] = colors[index[i]];
FastLED.show();
delay(750);
leds[i] = CRGB::Black;
FastLED.show();
delay(250);
} else if (isSpace(c)) {
delay(1000);
}
}
void write(const char *str) {
while (*str) write(*str++);
}
void LiteUp(){ // Turn all on
for (size_t i = 0; i < countof(leds); i++) leds[i] = colors[index[i]];
FastLED.show();
}
void Flicker (){ // Flicker the strand
for (int i = 0; i < 128; i++) {
if (random8() > ease8InOutQuad(i*2))
FastLED.show();
else
// To prevent having to repopulate leds[], we
// simply show black instead of clearing the array.
FastLED.showColor(CRGB::Black);
delay(33);
}
FastLED.clear();
}Sure thing - you can find all the code here - updated it last night, I know the python code is a bit messy still, but I'm hoping to get it all cleaned up by later tonight.
. Really great!
// For 50-pixel strand
case 'A'...'H':
return 50 - (c - 'A');
case 'I'...'P':
return 30 + (c - 'I');
case 'Q':
return 39;
case 'R'...'Y':
return 26 - (c - 'R');
case 'Z':
return 17;Man you went all out! That is really cool. Great job and thanks for sharing all the details behind it.
Looks great! Awesome idea using the eggo box haha. Looking forward to seeing more pics.
