Light of the Dancer

// This #include statement was automatically added by the Particle IDE.
#include <Stepper.h>
// This #include statement was automatically added by the Particle IDE.
#include <ArduinoJson.h>
#include "Particle.h"
SYSTEM_MODE(AUTOMATIC);
SerialLogHandler logHandler(LOG_LEVEL_INFO);
JsonDocument doc;
int traffic = 30;
bool done = true;
const int stepsPerRevolution = 2048; 

// Any digital pins should work. Change as necessary.
#define IN1 2
#define IN2 3
#define IN3 4
#define IN4 5

// Pins entered in sequence IN1-IN3-IN2-IN4 for proper step sequence
Stepper myStepper(stepsPerRevolution, IN1, IN3 , IN2, IN4);
void setup()
{
    Serial.begin(9600);
    pinMode(8, OUTPUT);
    digitalWrite(8, HIGH);
    Serial.println("Particle connected to cloud!");
    myStepper.setSpeed(0);
  
    while(Particle.disconnected()) ;
  
    // Adjustable range of 28BYJ-48 stepper is 0~17 revolutions per minute
    // Optimal is 10-17 rpm

    Particle.subscribe("hook-response/dTraffic/", extractInfo);
}

void loop()
{
    if(done){
        String data = String(10);
        Particle.publish("dTraffic", data, PRIVATE);
        done = false;
    }
    if(Time.minute() == 0){
        String data = String(10);
        Particle.publish("dTraffic", data, PRIVATE);
        done = false;
    }
    float base = (traffic-15.0);
    double expo = (cbrt(base));
    Serial.println(traffic);
    Serial.println(base);
    Serial.println(expo);
    myStepper.setSpeed((int)((-3*expo)+9));
    Serial.println((int)((-3*expo)+9));
    myStepper.step(stepsPerRevolution);
}

void extractInfo(const char *event, const char *data)
{
    Serial.println("Handler is starting...");
    deserializeJson(doc, data);
    JsonObject root_0 = doc[0];
    traffic = root_0["_traffic"];
    myStepper.setSpeed(traffic);
    Serial.println(traffic);
}