Idea - LEDs bouncing both left and right from the center

[PlastiBots]

Hi. Sorry, as I tried to find other ways to contact you. Not an issue, but feature enhancement request. Would you be able to post a code sample (Arduino) that lights the LEDs from the middle and bounces outwards both left and right sides. Like this:

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[PlastiBots]

I figured it out. After trying to understand bit shifting and testing all sorts of changes, all I needed was a good nights sleep and woke up with an idea seek where the LEDs are lit, and the below was the only area, so I just added the ability to light the mirroring LEDs from the right side to centre. Also note that I removed the code that drops the LEDs away at the end as I did not need it.

for (uint8_t i = 0; i < BLOCK; i++)
{
if (y<0) break;
Serial.print("y="); Serial.println(y);
LED.setPixelColor ((LED_NUM-1)-y, rgb); // <<< Added to make LEDs match from the right side to centre.
LED.setPixelColor (y--, rgb); //default
//delay(30);
}

Also, in the main loop, you have to set the sequence to only do half of the LEDs from the left side by adding: h=h/2;

void loop () {
int32_t y; // LED block start position (0 is the top)
int32_t v; // Fall speed
int32_t h = (int32_t) LED_NUM << 8; // lowest point position
h=h/2; //Added to half the LEDs

[KenKenMkIISR]

Hi. I don't know if it meets your expectations, but I made something like this. Try it.
You can watch the video here.
https://twitter.com/KenKenMkIISR/status/1389630798177832961

// LED Vibration by KenKen
#include <Adafruit_NeoPixel.h>
#define PIN 6
#define LED_NUM 60
#define KMIN 5
#define KMAX 150
#define V0 600
#define R1 4
#define R2 5
#define COLOR 0x400000
Adafruit_NeoPixel LED = Adafruit_NeoPixel(LED_NUM, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
LED.begin();
LED.show();
}

void loop() {
int32_t x,v,k;
int8_t f;
k=KMIN;x=0;v=V0;f=1;
while(1){
if(LED_NUM/2+(x>>8)>=0 && (x>>8)<LED_NUM/2){
LED.setPixelColor(LED_NUM/2+(x>>8),COLOR);
LED.show();
LED.setPixelColor(LED_NUM/2+(x>>8),0);
}
v-=x/k;
if(x<0 && x+v>=0){
if(f) k=(kR2)/R1;
else k=(kR1)/R2;
if(k>=KMAX){
k=KMAX;
f=0;
}
else if(k<=KMIN){
k=KMIN;
f=1;
}
}
x+=v;
delay(15);
}
}

[PlastiBots]

Hi, Thanks very much for this. It has an error: “kr2 was not declared in this scope”, but it’s ok because I got it working. See below for my code sample. In my case I am just using red as a colour (will be using this for my Miata brake light center bar) // Bouncing LED by KenKen // Arduino version //v4 attempt to get both sides from middle out. #include <Adafruit_NeoPixel.h> #define PixelPin 5 // Signal terminal pin number #define LED_NUM 90 // Total number of LEDs #define BLOCK 9 // LED block length (number of LEDs) //for car ~8=10 is good. #define BRIGHT 10 // Brightness default 60 - note this gets multipled in code, so not standard 0-255 #define GRAVITY 20 // Gravitational acceleration - default 20 // Bounce coefficient at the lowest point = R1 / R2 #define R1 3 // Bounce coefficient 1 default 3 #define R2 6 // Bounce coefficient 2 default 5 >> 8 is nice #define REFMINV -80 // Minimum bounce speed uint8_t col = 1; // Color of falling LED block Adafruit_NeoPixel pixels = Adafruit_NeoPixel (LED_NUM, PixelPin, NEO_GRB + NEO_KHZ800); void set_block (uint16_t y, uint8_t c) { // LED block display // y Start position of LED block to be displayed // c Display color 0 (off), 1 (red) -8 (green) -16 (blue) -24 (red) uint32_t rgb; if (c == 0) rgb = pixels.Color (0,0,0); //else if (c <= 8) rgb = pixels.Color (150,0,0); //DJA - to make it all red else if (c <= 8) rgb = pixels.Color ((uint16_t) (16-c) * BRIGHT >> 3,0,0); //DJA - to make it all red else return; for (uint8_t i = 0; i < BLOCK; i++) { if (y<0) break; Serial.print("y="); Serial.println(y); pixels.setPixelColor ((LED_NUM-1)-y, rgb); //DJA - added for right side sweeping to center pixels.setPixelColor (y--, rgb); //default //delay(30); } } void setup () { Serial.begin(115200); // LED initialization, whole erase pixels.begin(); pixels.show(); } void loop () { int32_t y; // LED block start position (0 is the top) int32_t v; // Fall speed int32_t h = (int32_t) LED_NUM << 8; // lowest point position h=h/2; //DJA - only want to go to the middle halfway point // Bouncing LED loop do { // LED block initial position, initial speed setting y = 0; v = 0; do { set_block ((uint16_t) (y >> 8), col); // LED block display pixels.show(); delay(10); set_block ((uint16_t) (y >> 8), 0); // Erase LED block v = v + GRAVITY; // Fall speed update y = y + v; // Update LED block start position if (y>= h) {// In case of collision with the lowest point y = h-256; // Return to collision position v = -v * R1 / R2; // Bounce if (v> REFMINV) {// Stop when the bounce speed is less than a certain value set_block ((uint16_t) (h >> 8) -1, col); // Fixed display of LED block above the current lowest point h = h-(int32_t) (BLOCK * 256); // Raise the lowest point by one block //col = (col + 18)% 24 + 1; // Change to the next color DJA - removed so colour doesnt change } } } while (y<h); // Repeat while the beginning of the LED block is above the lowest point } while (h>=256); // Repeat until the lowest point is less than 1 pixels.show(); delay (1500); //BELOW CAN BE REMOVED // Fall of the entire connected LED (removes all LEDs - set to 0.) y = 0; // The position of the end of the LED that is connected and falls v = 0; // Overall falling speed do { y = y + v; // Update the last position v = v + GRAVITY / 2; // Fall speed update (considering friction) //for (int16_t i=(LED_NUM/2)-1; i>=(int16_t) (y >> 8); i--) { for (int16_t i=(LED_NUM/2)-1; i>=(int16_t) (y >> 8); i--) { //added DJA half pixels int32_t y1 = ((int32_t) i << 8) + (y & 0xff) -v; // Current position of the next LED that falls to the position of LED number i if (y1>=y) { // Copy the LED color at y1 position to LED number i pixels.setPixelColor (i, pixels.getPixelColor ((uint16_t) (y1 >> 8))); pixels.setPixelColor (LED_NUM-1 - i, pixels.getPixelColor ((uint16_t) (y1 >> 8))); //DJA added for half pixels } else { // LED goes out above the end pixels.setPixelColor (i, pixels.Color (0,0,0)); pixels.setPixelColor (LED_NUM - i, pixels.Color (0,0,0)); //DJA added for half pixels } } pixels.show(); delay (10); } while (y <(int32_t) LED_NUM << 8); // Repeat until the end exceeds the total number of LEDs delay (500); } From: KenKenMkIISR ***@***.***> Sent: Tuesday, May 04, 2021 1:27 PM To: KenKenMkIISR/Bouncing-LED ***@***.***> Cc: Dave ***@***.***>; Author ***@***.***> Subject: Re: [KenKenMkIISR/Bouncing-LED] Idea - LEDs bouncing both left and right from the center (#1) Hi. I don't know if it meets your expectations, but I made something like this. Try it. // LED Vibration by KenKen #include <Adafruit_NeoPixel.h> #define PIN 6 #define LED_NUM 60 #define KMIN 5 #define KMAX 150 #define V0 600 #define R1 4 #define R2 5 #define COLOR 0x400000 Adafruit_NeoPixel LED = Adafruit_NeoPixel(LED_NUM, PIN, NEO_GRB + NEO_KHZ800); void setup() { LED.begin(); LED.show(); } void loop() { int32_t x,v,k; int8_t f; k=KMIN;x=0;v=V0;f=1; while(1){ if(LED_NUM/2+(x>>8)>=0 && (x>>8)<LED_NUM/2){ LED.setPixelColor(LED_NUM/2+(x>>8),COLOR); LED.show(); LED.setPixelColor(LED_NUM/2+(x>>8),0); } v-=x/k; if(x<0 && x+v>=0){ if(f) k=(kR2)/R1; else k=(kR1)/R2; if(k>=KMAX){ k=KMAX; f=0; } else if(k<=KMIN){ k=KMIN; f=1; } } x+=v; delay(15); } } — You are receiving this because you authored the thread. 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[PlastiBots]

I've linked a video of it running. https://youtu.be/fX_kf7aO0D8