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- // led strip postition to ultrasonic distance
- int SDI = 2; //Red wire (not the red 5V wire!)
- int CKI = 3; //Green wire
- // red 5+ / blue GND
- int ledPin = 13; //On board LED
- #define ECHOPIN 6
- #define TRIGPIN 7
- #define STRIP_LENGTH 32 //32 LEDs on this strip
- long view_buffer[STRIP_LENGTH];
- int echo_timer = 0;
- float distance;
- typedef struct _pixel {
- int bri;
- int col;
- int dir;
- uint32_t color;
- };
- _pixel pixel[32];
- int app_timer = 0;
- int serial_on = 0;
- void setup() {
- if (serial_on == 1) {
- Serial.begin(115200);
- }
- init_pin();
- init_echo();
- clear_buffer();
- randomSeed(analogRead(0));
- }
- void init_pin() {
- pinMode(SDI, OUTPUT);
- pinMode(CKI, OUTPUT);
- pinMode(ledPin, OUTPUT);
- }
- void init_echo() {
- pinMode(ECHOPIN, INPUT);
- pinMode(TRIGPIN, OUTPUT);
- }
- void loop() {
- // works_cycle();
- // winkle_cycle();
- loop_echo();
- pixel_render();
- // trailer_cycle();
- // yellow_cycle();
- //loop_test();
- post_frame();
- }
- void loop_echo() {
- echo_timer++;
- if (echo_timer == 2) {
- echo_timer = 0;
- digitalWrite(TRIGPIN, LOW);
- delayMicroseconds(2);
- digitalWrite(TRIGPIN, HIGH);
- delayMicroseconds(10);
- digitalWrite(TRIGPIN, LOW);
- distance = pulseIn(ECHOPIN, HIGH);
- distance = distance / 58;
- //if (serial_on == 1) {
- // Serial.println(distance);
- //}
- }
- }
- void loop_test() {
- //Pre-fill the color array with known values
- view_buffer[0] = 0xFF0000; //Bright Red
- view_buffer[1] = 0x00FF00; //Bright Green
- view_buffer[2] = 0x0000FF; //Bright Blue
- view_buffer[3] = 0x010000; //Faint red
- view_buffer[4] = 0x800000; //1/2 red (0x80 = 128 out of 256)
- post_frame(); //Push the current color frame to the strip
- delay(2000);
- while(1){ //Do nothing
- addRandom();
- post_frame(); //Push the current color frame to the strip
- digitalWrite(ledPin, HIGH); // set the LED on
- delay(25); // wait for a second
- digitalWrite(ledPin, LOW); // set the LED off
- delay(25); // wait for a second
- }
- }
- //Throws random colors down the strip array
- void addRandom(void) {
- int x;
- //First, shuffle all the current colors down one spot on the strip
- for(x = (STRIP_LENGTH - 1) ; x > 0 ; x--)
- view_buffer[x] = view_buffer[x - 1];
- //Now form a new RGB color
- long new_color = 0;
- for(x = 0 ; x < 3 ; x++){
- new_color <<= 8;
- new_color |= random(0xFF); //Give me a number from 0 to 0xFF
- //new_color &= 0xFFFFF0; //Force the random number to just the upper brightness levels. It sort of works.
- }
- view_buffer[0] = new_color; //Add the new random color to the strip
- view_buffer[0] = 16;
- }
- //Takes the current strip color array and pushes it out
- void post_frame (void) {
- //Each LED requires 24 bits of data
- //MSB: R7, R6, R5..., G7, G6..., B7, B6... B0
- //Once the 24 bits have been delivered, the IC immediately relays these bits to its neighbor
- //Pulling the clock low for 500us or more causes the IC to post the data.
- for(int LED_number = 0 ; LED_number < STRIP_LENGTH ; LED_number++) {
- long this_led_color = view_buffer[LED_number]; //24 bits of color data
- for(byte color_bit = 23 ; color_bit != 255 ; color_bit--) {
- //Feed color bit 23 first (red data MSB)
- digitalWrite(CKI, LOW); //Only change data when clock is low
- long mask = 1L << color_bit;
- //The 1'L' forces the 1 to start as a 32 bit number, otherwise it defaults to 16-bit.
- if(this_led_color & mask)
- digitalWrite(SDI, HIGH);
- else
- digitalWrite(SDI, LOW);
- digitalWrite(CKI, HIGH); //Data is latched when clock goes high
- }
- }
- //Pull clock low to put strip into reset/post mode
- digitalWrite(CKI, LOW);
- delayMicroseconds(500); //Wait for 500us to go into reset
- }
- void clear_buffer() {
- memset(view_buffer, 0, 32);
- }
- void shift_pixel(int dir) {
- int e;
- for (uint16_t i = 0; i < STRIP_LENGTH; i++) {
- e = i + dir;
- if (e > -1 && e < STRIP_LENGTH) {
- //view_buffer[i] = view_buffer[e];
- pixel[i] = pixel[e];
- }
- }
- }
- uint32_t Color(byte r, byte g, byte b) {
- uint32_t c;
- c = r;
- c <<= 8;
- c |= g;
- c <<= 8;
- c |= b;
- return c;
- }
- void pixel_render() {
- int bri;
- int echo;
- // float a;
- echo = distance;
- if (echo > STRIP_LENGTH * 2) {
- echo = STRIP_LENGTH * 2;
- } else if (echo < 0) {
- echo = 0;
- } else {
- };
- echo = (STRIP_LENGTH * 2) - echo;
- // echo = echo;
- if (serial_on == 1) {
- Serial.println(echo);
- }
- for (uint16_t i = 0; i < STRIP_LENGTH; i++) {
- // a = (i / 2) + (millis() / 250.0);
- // bri = sin(a) * 127.0;
- // bri = sin(a) * echo;
- // bri = echo;
- // bri = echo;
- // view_buffer[i] = Color(bri, bri, 0);
- if (i * 2 < echo) {
- // view_buffer[i] = Color(echo, 0, 0);
- if (i % 2 == 0) {
- view_buffer[i] = Color(0, echo * 2, 0);
- } else {
- view_buffer[i] = Color(0, 0, echo * 2);
- }
- } else {
- view_buffer[i] = Color(0, 0, 0);
- }
- }
- }
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