Hey there everyone,
For anyone that are fans of the show, you have probably see this project online already, or something similar. The difference between my project and the others, is that I’m trying to scale it down for a gingerbread house. I have it working mostly the way I want it, but I wanted to be able to send the serial text via bluetooth from my phone. Currently, I am only able to get the results I want through Putty or the serial monitor. Here’s what I have so far:
WS2811 Individually Programmable LED’s (cut down to 26 total)
Arduino UNO
HM-10 Bluetooth Module (needed for iPhone)
This is my first project with the Arduino, so I’m not too savvy with the programming language…but I’m learning. If anyone has any ideas on where this code is wrong, please let me know. The original code was written by Zach Hipps, I just modified it for my needs:
/*
* Stranger Things Message Wall
* Written by Zach Hipps 2017 for byte sized YouTube channel: https://www.youtube.com/c/bytesized
*
* Build instructions can be found at https://www.bytesizedelectronics.com/projects/how-to-make-a-stranger-things-message-wall
* Video can be found at https://youtu.be/tG8sQMoKrb0
*
* How to use:
* -----------
* Connect string of WS2811 LEDs (or equivient) to the arduino with the data signal going to pin 3.
* Be sure to use a separate power supply as the arduino's voltage regulator cannot supply enough current for all these LEDs.
* Send serial data to the program either using the serial monitor, or some external serial device (like HC-05 bluetooth module) connected to RX and TX pins.
*
* Known issues:
* ------------
* Due to strict timing requirments from the WS2811 LEDs, the FastLED library has to disable interrupts when writing to the LEDs. This will cause some serial data to be lost.
* The practical result is that messages longer than 6 characters seem to get truncated. Some sort of software buffering could potentially fix this. See https://github.com/FastLED/FastLED/wiki/Interrupt-problems
*
*/
#include "FastLED.h" // This is the library that does all the work with the LEDs
#define NUM_LEDS 26 // The number of LEDs in the string
#define DATA_PIN 3 // The pin that connects to the data signal on the LEDs
CRGB leds[NUM_LEDS]; // Define array with NUM_LEDS elements
CRGB led_color[NUM_LEDS]= // Define array to store LED colors
{
led_color[0] = CRGB (100,0,0), //RED
led_color[1] = CRGB (0,100,0), //GREEN
led_color[2] = CRGB (0,0,100), //BLUE
led_color[3] = CRGB (100,100,0), //YELLOW
led_color[4] = CRGB (100,100,100), //WHITE
led_color[5] = CRGB (100,0,0), //RED
led_color[6] = CRGB (0,100,0), //GREEN
led_color[7] = CRGB (0,0,100), //BLUE
led_color[8] = CRGB (100,100,0), //YELLOW
led_color[9] = CRGB (100,100,100), //WHITE
led_color[10] = CRGB (100,0,0), //RED
led_color[11] = CRGB (0,100,0), //GREEN
led_color[12] = CRGB (0,0,100), //BLUE
led_color[13] = CRGB (100,100,0), //YELLOW
led_color[14] = CRGB (100,100,100), //WHITE
led_color[15] = CRGB (100,0,0), //RED
led_color[16] = CRGB (0,100,0), //GREEN
led_color[17] = CRGB (0,0,100), //BLUE
led_color[18] = CRGB (100,100,0), //YELLOW
led_color[19] = CRGB (100,100,100), //WHITE
led_color[20] = CRGB (100,0,0), //RED
led_color[21] = CRGB (0,100,0), //GREEN
led_color[22] = CRGB (0,0,100), //BLUE
led_color[23] = CRGB (100,100,0), //YELLOW
led_color[24] = CRGB (100,100,100), //WHITE
led_color[25] = CRGB (100,0,0), //RED
};
void setup()
{
Serial.begin(2000000); // start serial peripheral
FastLED.addLeds<WS2811, DATA_PIN, RGB>(leds, NUM_LEDS); // instantiate LED library with our information
FastLED.clear(); // clear the LED display before doing anything else
}
void loop()
{
if(Serial.available()) // If there is serial data waiting in the buffer
{
ascii2ledIndex(Serial.read()); // read the data and convert each letter from ascii to the appropriate LED index in the string
}
}
// Convert a letter from ascii to the appropriate LED index in the string
void ascii2ledIndex(int asciiLetter)
{
//Serial.println(asciiLetter);
int ledIndex = 0; // create variable to store led index
int indexMap[]={25, 24, 23, 22, 21, 20, 19, 18, 9, 10, 11, 12, 13, 14, 15, 16, 17, 8, 7, 6, 5, 4, 3, 2, 1, 0}; // When I hung the LED string on the wall the first letters in the string are R S T U V W X Y Z then it skips one LED and winds around to Q P O N M L K J I then it skips one LED and winds to A B C D E F G H
if(asciiLetter >= 97 && asciiLetter <= 122) // It's an ASCII Lowercase Letter
{
ledIndex = indexMap[asciiLetter - 97];
}
else if (asciiLetter >= 65 && asciiLetter <= 90) // It's an ASCII Uppercase Letter
{
ledIndex = indexMap[asciiLetter - 65];
}
Serial.println(ledIndex);
if(ledIndex >= 0) // valid LED index converted from either uppercase or lowercase letter
{
leds[ledIndex] = led_color[ledIndex];
FastLED.show();
delay(500);
FastLED.clear();
FastLED.show();
delay(250);
}
else // invalid led index. display blank. this is useful for spaces and other punctuation.
{
FastLED.clear();
FastLED.show();
delay(750);
}
}
// Test function that displays one LED at a time. This appears like the LED is chasing down the string.
void chase()
{
for(int dot = 0; dot < NUM_LEDS; dot++)
{
leds[dot] = led_color[dot];
FastLED.show();
// clear this led for the next time around the loop
leds[dot] = CRGB::Black;
delay(100);
}
}
// Test function that blinks all the LEDs
void RGB_Blink()
{
// Set all the colors
leds[25] = led_color[0];
leds[24] = led_color[1];
leds[23] = led_color[2];
leds[22] = led_color[3];
leds[21] = led_color[4];
leds[20] = led_color[5];
leds[19] = led_color[6];
leds[18] = led_color[7];
leds[9] = led_color[8];
leds[10] = led_color[9];
leds[11] = led_color[10];
leds[12] = led_color[11];
leds[13] = led_color[12];
leds[14] = led_color[13];
leds[15] = led_color[14];
leds[16] = led_color[15];
leds[17] = led_color[16];
leds[8] = led_color[17];
leds[7] = led_color[18];
leds[6] = led_color[19];
leds[5] = led_color[20];
leds[4] = led_color[21];
leds[3] = led_color[22];
leds[2] = led_color[23];
leds[1] = led_color[24];
leds[0] = led_color[25];
FastLED.show();
delay(750);
// Now turn the LED off, then pause
FastLED.clear();
FastLED.show();
delay(500);
}
