ephemera/arduino/arduino.ino

#include <Wire.h>
#include <Adafruit_PWMServoDriver.h>

Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver();

#define SERVOMIN  330 // this is the 'minimum' pulse length count (out of 4096) - increasing SERVOMIN decrease speed
#define SERVOMAX  390 // this is the 'maximum' pulse length count (out of 4096)
#define TIMER 200
#define SERVODIVIDER 5
#define STRIP 10

const char HEADER    = 'H';
const char A_TAG    = 'M';
const char B_TAG    = 'X';
const char C_TAG    = 'U';
const char F_TAG    = 'F';

const int  TOTAL_BYTES  = 10  ; // the total bytes in a message

int atomPins[] = {2,3,4,5,6,7,8,9};
int currentValue = 0;
int values[] = {0,0,0,0,0,0,0,0};

int cycle = 0;
boolean fadeDirection = 0; // 0 grow
byte fadeStatus = 0;

void setup() {
  Serial.begin(9600);
  
  for(int i=0; i<8; i++) {
    pinMode(atomPins[i], OUTPUT);
    pwm.setPWM(i, 0, ((SERVOMAX-SERVOMIN)/2)+SERVOMIN);
  }

  pinMode(STRIP, OUTPUT);
  fadeIn();
  pwm.begin();
  pwm.setPWMFreq(60);  // Analog servos run at ~60 Hz updates

  delay(10);
}
 
void setServoPulse(uint8_t n, double pulse) {
  double pulselength;
  
  pulselength = 1000000;   // 1,000,000 us per second
  pulselength /= 60;   // 60 Hz
  Serial.print(pulselength); Serial.println(" us per period"); 
  pulselength /= 4096;  // 12 bits of resolution
  Serial.print(pulselength); Serial.println(" us per bit"); 
  pulse *= 1000000;  // convert to us
  pulse /= pulselength;
  Serial.println(pulse);
  pwm.setPWM(n, 0, pulse);
}

void loop() {   

  cycle = 0;
  
  for(int i=0; i<8; i++) {
    values[i] = 0;
  }

  if(Serial.available() >= TOTAL_BYTES) {
     if( Serial.read() == HEADER) {
      char tag = Serial.read();
      
      if(tag == F_TAG) {
         fadeOut();
      }
      
      if(tag == A_TAG || tag == B_TAG) {
        for(int i=0; i<8; i++) {
          values[i] = Serial.read();
        }
      } 
    
      for(int i=0; i<8; i++) {
        if(tag == A_TAG) {
          pwm.setPWM(i, 0, SERVOMAX+50);
          delay(100*SERVODIVIDER);
          pwm.setPWM(i, 0, SERVOMAX-50);
          delay(100*SERVODIVIDER);
        }
        pwm.setPWM(i, 0, SERVOMIN);
        delay(values[i]*SERVODIVIDER);
        pwm.setPWM(i, 0, ((SERVOMAX-SERVOMIN)/2)+SERVOMIN);
      }
      
      if(tag == C_TAG) {
        
        for(int i=0; i<8; i++) {
          pwm.setPWM(i, 0, SERVOMAX+50);
          delay(100*SERVODIVIDER);
          pwm.setPWM(i, 0, ((SERVOMAX-SERVOMIN)/2)+SERVOMIN);
        }
      
        
      } else {
        
        for(int i=0; i<8; i++) {
          Serial.print(values[i]);
          Serial.print(" ");
          if(values[i]>0) {
            values[i]--;
            digitalWrite(atomPins[i], HIGH);
            if(values[i]==0) {
              cycle++;
              digitalWrite(atomPins[i], LOW);
            }
          } 
        }
        
        if(tag == A_TAG) {
          while(cycle < 8) {
            cycle = 0;
            for(int i=0; i<8; i++) {
              Serial.print(values[i]);
              Serial.print(" ");
              if(values[i]>0) {
                values[i]--;
                digitalWrite(atomPins[i], HIGH);
                if(values[i]==0) {
                  cycle++;
                  digitalWrite(atomPins[i], LOW);
                }
              } else {
                cycle++;
              }
              
              for(int f=0;f<4;f++){
                fadeGradient();
                delay(TIMER/(8*4));
              }
            }
            Serial.println("");
          }
            
          fadeIn();
        }
      }
    }
  }
} 

void fadeIn() {
  for(int i=0; i<255; i++) {
    analogWrite(STRIP, i);
    delay(10);
  }
}

void fadeOut() {
  for(int i=255; i>0; i--) {
    analogWrite(STRIP, i);
    delay(10);
  }
}

void fadeGradient() {
  if(fadeDirection == 0) {fadeStatus++;}
  if(fadeDirection == 1) {fadeStatus--;}
  
  if(fadeStatus == 0) {fadeDirection = 0;}
  if(fadeStatus == 255) {fadeDirection = 1;}
  
  analogWrite(STRIP, fadeStatus);
}