i2c_DSM501A_particle_sensor_20240330151128.ino のバックアップ(No.1)

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/**********
DSM501A とarduinoの接続
#3 vcc             5v
#4 vout1          pin8
#5 GND            GND
**********/       
 
int pin = 8;
unsigned long duration;
unsigned long starttime;
unsigned long sampletime_ms = 30000;
unsigned long lowpulseoccupancy = 0;
float ratio = 0;
float concentration = 0;
unsigned int i_concentration=0;
#define SLAVE_ADDRESS 0x15
 
void setup() {
  Serial.begin(9600);
  pinMode(8,INPUT);
  starttime = millis();
 
  // initialize i2c as slave
  Wire.begin(SLAVE_ADDRESS);
  //Wire.setClock(400000); //400Khz i2c clock
 
  // define callbacks for i2c communication
  Wire.onReceive(receiveEvent);
  Wire.onRequest(requestEvent);
}
 
void loop() {
  duration = pulseIn(pin, LOW);
  lowpulseoccupancy = lowpulseoccupancy+duration;
 
  if ((millis()-starttime) > sampletime_ms)
  {
    ratio = lowpulseoccupancy/(sampletime_ms*10.0);  // Integer percentage 0=>100
    concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve
    i_conecentration=concentration;
    //Serial.print(lowpulseoccupancy);
    // Serial.print(",");
    Serial.print(ratio);
    Serial.print(",");
    Serial.print(concentration);
    Serial.print(" _ ");
    Serial.println(i_concentration);
    lowpulseoccupancy = 0;
    starttime = millis();
  }
}
 
 
byte cmd[5];
int writeFlag;
byte wx[5];
 
void receiveEvent(int n) {
//  Serial.print("receiveEvent, n=");
//  Serial.print(n);
//  Serial.print(",cmd=");
  if(n>1) writeFlag=1; else writeFlag=0;
  for(int i=0; i<n; i++){
    if(Wire.available()){
      cmd[i]=Wire.read();
//      Serial.print(cmd[i],HEX);
    }
  }
//  Serial.println();
  if(!writeFlag) return;
  if(cmd[0]==0x03){ // if read, read MSB of the sample rate,
                           // if write, set MSB of the sample rate.
 
  } else if(cmd[0]==0x04) { // if read, read LSB of the sample rate,
                            // if write, set LSB of the sample rate.
 
  } 
 
}
 
void requestEvent(){
  byte w;
//  Serial.print("requestEvent, cmd=");
//  Serial.println(cmd[0],HEX);
  if(writeFlag) {
//    Serial.println("w, return.");
    return;
  }
  else{
//    Serial.println("r, ...");
  }
  if(cmd[0]==0x00) { // if read, read currentActivity
      w= (i_concentration >>8) & 0xff;
      Wire.write(w);
//      Serial.print("current=");
//      Serial.println(w);     
  } else if(cmd[0]==0x01){ // if read, read MSB of the accumulated activity;
      unsigned int wi=concentration;
      wx[1]=wi & 0xff; wi=wi>>8;
      wx[0]=wi & 0xff;
      w=wx[0];
      Wire.write(w);
//      Serial.print("activity=");
//      Serial.print(activity);
//      Serial.print(", activity[0]=");
//      Serial.println(wx[0]);      
  } else if(cmd[0]==0x02) { // if read, read LSB of the accumulated activity;
      unsigned int wi=concentration;
      wx[1]=wi & 0xff; wi=wi>>8;
      wx[0]=wi & 0xff;
      w=wx[1];
      Wire.write(w);
//      Serial.print("activity=");
//      Serial.print(activity);      
//      Serial.print(", activity[1]=");
//      Serial.println(wx[1]);      
  } else if(cmd[0]==0x03){ // if read, read MSB of the sample rate,
      unsigned int wi=concentration;
      wx[3]=wi & 0xff; wi=wi>>8;
      wx[2]=wi & 0xff; wi=wi>>8;
      wx[1]=wi & 0xff; wi=wi>>8;
      wx[0]=wi & 0xff;
      w=wx[2];
      Wire.write(w);
//      Serial.print("sampleRate_ms=");
//      Serial.print(sampleRate_ms);
//      Serial.print(", sampleRate_ms[2]=");
//      Serial.println(wx[2]);      
  } else if(cmd[0]==0x04) { // if read, read LSB of the sample rate,
      unsigned int wi=concentration;
      wx[3]=wi & 0xff; wi=wi>>8;
      wx[2]=wi & 0xff; wi=wi>>8;
      wx[1]=wi & 0xff; wi=wi>>8;
      wx[0]=wi & 0xff;
      w=wx[3];
      Wire.write(w);
//      Serial.print("sampleRate_ms=");
//      Serial.print(sampleRate_ms);
//      Serial.print(", sampleRate_ms[3]=");
//      Serial.println(wx[3]);      
  }
}