Interactive Sculpture Powered by Real-Time Car Accident Data

// This #include statement was automatically added by the Particle IDE.
#include <neopixel.h>
#include "Particle.h"

SYSTEM_MODE(AUTOMATIC);

// IMPORTANT: Set pixel COUNT, PIN and TYPE
#if (PLATFORM_ID == 32)
  #define PIXEL_PIN    SPI1
#else
  #define PIXEL_PIN    D2
#endif
#define PIXEL_COUNT  2
#define PIXEL_TYPE   WS2812B

// --- servo calibration ---
const int servoPin    = D1;    // D1 is pin 1 on Photon
int currentAngle = 79;

Adafruit_NeoPixel strip(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);
Servo myServo;

const unsigned long DAY = 86400UL * 1000UL;
unsigned long lastPublished = 0;

void setup() {
    Particle.syncTime();
    Time.zone(-5);

    strip.begin();
    strip.clear();
    strip.show();

    myServo.attach(servoPin);

    Serial.begin(9600);
    Particle.subscribe("hook-response/crash",   handleEventResponse, MY_DEVICES);
    Particle.subscribe("hook-response/<12",     lessThan12);
    Particle.subscribe("hook-response/<24",     lessThan24,         MY_DEVICES);
    Particle.subscribe("hook-response/<48",     lessThan48);
    Particle.subscribe("hook-response/>48",     moreThan48,         MY_DEVICES);

    delay(2000);

    smoothServoMove(80);

    delay(1000);
    
    // Particle.publish("crash");
    // Serial.println("crash published");
}

void loop() {
    // unsigned long now = millis();
    // if (now > lastPublished + DAY) {
    //     lastPublished = now;
    //     Particle.publish("crash");
    //     Serial.println("crash published");
    // }
    
    delay(6000);
    
    adjustCar(6);
    
    delay(6000);
    
    adjustCar(18);
    
    delay(6000);
    
    adjustCar(36);
    
    delay(6000);
    
    adjustCar(49);
}

void smoothServoMove(int targetAngle) {
    if (currentAngle == targetAngle) return;
    
    int step = (targetAngle > currentAngle) ? 1 : -1;
    for (int a = currentAngle; a != targetAngle; a += step) {
        myServo.write(a);
        delay(15);  // 10 ms per degree → ~100°/s
    }
    
    myServo.write(targetAngle);
    
    currentAngle = targetAngle;
}

void adjustCar(int hoursAgo) {
    if (hoursAgo > 48) hoursAgo = 48;

    if      (hoursAgo < 12) strip.setColor(0,255,0,0),   strip.setColor(1,255,0,0);   // red
    else if (hoursAgo < 24) strip.setColor(0,255,165,0), strip.setColor(1,255,165,0);  // orange
    else if (hoursAgo < 48) strip.setColor(0,160,32,240),strip.setColor(1,160,32,240);  // purple
    else                    strip.setColor(0,255,255,255),strip.setColor(1,255,255,255);  // white
    strip.show();
    
    int angle = map(hoursAgo, 0, 48, 10, 80);
    smoothServoMove(angle);
}

void handleEventResponse(const char *event, const char *data) {
    String s = String(data);
    int year   = s.substring(0,4).toInt();
    int month  = s.substring(5,7).toInt();
    int day    = s.substring(8,10).toInt();
    int hour   = s.substring(11,13).toInt();
    int minute = s.substring(14,16).toInt();
    int second = s.substring(17,19).toInt();

    struct tm tm;
    tm.tm_year  = year - 1900;
    tm.tm_mon   = month - 1;
    tm.tm_mday  = day;
    tm.tm_hour  = hour;
    tm.tm_min   = minute;
    tm.tm_sec   = second;
    tm.tm_isdst = -1;

    time_t crashTime   = mktime(&tm);
    time_t currentTime = Time.now();
    int hoursAgo = (currentTime - crashTime) / 3600;
    
    adjustCar(hoursAgo);
}

void lessThan12(const char *e,const char*d){ adjustCar(6);  }
void lessThan24(const char *e,const char*d){ adjustCar(18); }
void lessThan48(const char *e,const char*d){ adjustCar(36); }
void moreThan48(const char *e,const char*d){ adjustCar(49); }