Air Quality Sensor Hub - Seeeduino XIAO Expansion Board

#include <Arduino.h>
#include <U8x8lib.h>
#include <Seeed_HM330X.h>
#include "SCD30.h"

#define SERIAL_OUTPUT SerialUSB
#define SERIAL SerialUSB

int pin = 7;
unsigned long duration;
unsigned long starttime;
unsigned long sampletime_ms = 5000;//sampe 30s ;
unsigned long lowpulseoccupancy = 0;
float ratio = 0;
float concentration = 0;

const int buttonPin = 1;
int buttonState = 0;
int memu = 0;

U8X8_SSD1306_128X64_NONAME_HW_I2C u8x8(/* reset=*/ U8X8_PIN_NONE);
HM330X sensor;
uint8_t buf[30];

const char* str[] = {"sensor num: ", "PM1.0 concentration(CF=1,Standard particulate matter,unit:ug/m3): ",
                     "PM2.5 concentration(CF=1,Standard particulate matter,unit:ug/m3): ",
                     "PM10 concentration(CF=1,Standard particulate matter,unit:ug/m3): ",
                     "PM1.0 concentration(Atmospheric environment,unit:ug/m3): ",
                     "PM2.5 concentration(Atmospheric environment,unit:ug/m3): ",
                     "PM10 concentration(Atmospheric environment,unit:ug/m3): ",
                    };


///////////////////////////////////////////////////////////////////
//PM2.5 concentration(Atmospheric environment,unit:ug/m3): value
///////////////////////////////////////////////////////////////////
HM330XErrorCode print_result(const char* str, uint16_t value) {
  if (NULL == str) {
    return ERROR_PARAM;
  }
  //  SERIAL_OUTPUT.print(str);
  u8x8.setFont(u8x8_font_chroma48medium8_r);
  u8x8.setCursor(0, 0);
  u8x8.print("PM2.5: ");
  u8x8.setCursor(7, 0);
  u8x8.print(value);
  u8x8.setCursor(11, 0);
  u8x8.print("ug/m");
  Serial.println(value);
  return NO_ERROR;
}

HM330XErrorCode print_result_1(const char* str, uint16_t value) {
  if (NULL == str) {
    return ERROR_PARAM;
  }
  //  SERIAL_OUTPUT.print(str);
  u8x8.setFont(u8x8_font_chroma48medium8_r);
  u8x8.setCursor(0, 0);
  u8x8.print("PM10: ");
  u8x8.setCursor(7, 0);
  u8x8.print(value);
  u8x8.setCursor(11, 0);
  u8x8.print("ug/m");
  Serial.println(value);
  return NO_ERROR;
}

/*parse buf with 29 uint8_t-data*/
HM330XErrorCode parse_result(uint8_t* data) {
  uint16_t value = 0;
  if (NULL == data) {
    return ERROR_PARAM;
  }
  value = (uint16_t) data[6 * 2] << 8 | data[6 * 2 + 1];
  print_result(str[6 - 1], value);
  return NO_ERROR;
}


HM330XErrorCode parse_result2(uint8_t* data) {
  uint16_t value = 0;
  if (NULL == data) {
    return ERROR_PARAM;
  }
  value = (uint16_t) data[7 * 2] << 8 | data[7 * 2 + 1];
  print_result_1(str[7 - 1], value);
  return NO_ERROR;
}

////////////////////////////////////////////////////////////////////

/*30s*/
void setup() {
  Serial.begin(115200);
  Wire.begin();
  u8x8.begin();
  u8x8.setFlipMode(0);
  scd30.initialize();
  pinMode(pin, INPUT);
  pinMode(buttonPin, INPUT_PULLUP);
  starttime = millis();//get the current time;

}

void loop() {
  float result[3] = {0};
  duration = pulseIn(pin, LOW);
  lowpulseoccupancy = lowpulseoccupancy + duration;

  buttonState = digitalRead(buttonPin);

  if (buttonState == LOW) {
    memu++;
    delay(15);
    if (memu == 2) {
      memu = 0;
    }
  }
  Serial.println(memu);

  if (scd30.isAvailable() && memu == 0) {
    scd30.getCarbonDioxideConcentration(result);
    u8x8.setFont(u8x8_font_chroma48medium8_r);
    u8x8.setCursor(0, 3);
    u8x8.print("CO2: ");
    u8x8.setCursor(5, 3);
    u8x8.print(result[0]);
    u8x8.setCursor(12, 3);
    u8x8.print("pmm");
    delay(1000);
  }

  if (sensor.read_sensor_value(buf, 29) && memu == 0) {
    SERIAL_OUTPUT.println("HM330X read result failed!!!");
  }
  if(memu == 0){
  parse_result(buf);
  }

  if ((millis() - starttime) > sampletime_ms  && memu == 0) {
    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

    u8x8.setFont(u8x8_font_chroma48medium8_r);
    u8x8.setCursor(0, 6);
    u8x8.print("Dust: ");

    u8x8.setCursor(6, 6);
    u8x8.print(concentration);

    u8x8.setCursor(12, 6);
    u8x8.print("pcs");

    //    Serial.println(concentration);
    lowpulseoccupancy = 0;
    starttime = millis();
  }



  if (scd30.isAvailable() && memu == 1) {
    scd30.getCarbonDioxideConcentration(result);
    u8x8.setFont(u8x8_font_chroma48medium8_r);
    u8x8.setCursor(0, 3);
    u8x8.print("Temp: ");
    u8x8.setCursor(6, 3);
    u8x8.print(result[1]);
    u8x8.setCursor(10, 3);
    u8x8.print(" C   ");
    
    u8x8.setCursor(0, 6);
    u8x8.print("Humi: ");
    u8x8.setCursor(5, 6);
    u8x8.print(result[2]);
    u8x8.setCursor(8, 6);
    u8x8.print("  %     ");

    delay(1000);
  }

  if (sensor.read_sensor_value(buf, 29) && memu == 1) {
    SERIAL_OUTPUT.println("HM330X read result failed!!!");
  }
  if(memu == 1){
  parse_result2(buf);
  }




}