led_candle.ino

/*
    -----------------------  pin 9
    |
    |
    \
    /
    \  100 ohm  
    /
    |
    |          \ |
    +---------| >|---------- GND
    |          / |
    |         LED
  pinA0
  
  0823 
  關掉通訊monotor之後會造成蠟燭自動明滅，推斷是因為serial關掉後迴圈變快，讓變化率跑偏
*/
#define BUFFER_SIZE 5
int CANDLE_PIN = 9;
long data_array[BUFFER_SIZE];
int array_index=0;
long max,min;
int steady_count=0;
int steady=0;
long now_value,last_value;
int holdtime = 0;
int candle_pwm = 255;
long sensorValue = 0;

void setup() {
    pinMode(CANDLE_PIN,OUTPUT);
  Serial.begin(9600);
  analogWrite(CANDLE_PIN,0);
}
void loop() {
    sensorValue = 0;
    // sum adc value
    for(int i=0;i<1024;i++){
      sensorValue += analogRead(A0);
    }
    // save value in array
    data_array[array_index] = sensorValue;
    if (array_index < BUFFER_SIZE-1) array_index++;
    else array_index = 0;
    // find max
    max = 0;
    for(int i; i<BUFFER_SIZE ;i++){
      if (data_array[i] > max) max = data_array[i];
    }
    // find min
    min = 9999999;
    for(int i; i<BUFFER_SIZE ;i++){
      if (data_array[i] < min) min = data_array[i];
    }
    
    now_value = ((array_index - 1) < 0)?data_array[BUFFER_SIZE-1]:data_array[(array_index - 1)];
    last_value = data_array[array_index];
/*    
if(((max - min) < 30000)){
      if (((now_value - last_value) > 1000) ) {
        if ( candle_pwm > 50)candle_pwm-=50;
      }else if(((now_value - last_value) > 300) ) {
        if ( candle_pwm > 20) candle_pwm-=10;
        //analogWrite(CANDLE_PIN, candle_pwm);
        holdtime = 20;
      }else {
        if (candle_pwm < 250) candle_pwm+=5;
        if (holdtime > 0) holdtime--;
        if (holdtime == 0) {
          candle_pwm = 255;
          //analogWrite(CANDLE_PIN, candle_pwm);
          
        }
      }
  analogWrite(CANDLE_PIN, candle_pwm);
}
*/
  if((candle_pwm == 255) && ((now_value - last_value) > 1000) && (last_value > 620000)) candle_pwm = 0, holdtime = 20;
  if(holdtime > 0) holdtime--;
  if (candle_pwm <= 240 && holdtime == 0) candle_pwm+=15;
  analogWrite(CANDLE_PIN, candle_pwm);

/*    
    if (steady == 1){
      if ((max - min) > 100) digitalWrite(A1, LOW);
      steady_count--;
      if(steady_count == 0){
        steady = 0;
        digitalWrite(A1, HIGH);
      }
    }else{
      if ( (max - min) < 100) steady_count++;
      if (steady_count > 50) steady = 1;
    }
*/    
    Serial.println(sensorValue);
//    Serial.println(max-min);
    Serial.println((now_value - last_value));
    Serial.println(candle_pwm);
    Serial.println(holdtime);
    Serial.println();
    
    delay(1);  
}