8. การใช้งาน ESP8266 กับเซนเซอร์วัดปริมาณฝุ่นละอองในอากาศ PMS5003

โมดูล PMS5003 เป็นโมดูลที่สามารถวัดค่าฝุ่นละอองในอากาศได้ทั้งหมด 3 ขนาด คือ pm1.0 pm2.5 และ pm10 ข้อมูลหน้าที่ตำแหน่งขาต่างๆ ดังรูป

ขาสัญญาณ Nodemcu ต่อเข้ากับโมดูล OLED ชนิด I2C

ตัวอย่าง 1. code การทำงานผ่าน Serial monitor ใน Arduino IDE

การใช้งานผ่าน Serial monitor

#include <Arduino.h>

#define LENG 31 //0x42 + 31 bytes equal to 32 bytes

unsigned char buf[LENG];

int PM01Value=0; //define PM1.0 value of the air detector module

int PM2_5Value=0; //define PM2.5 value of the air detector module

int PM10Value=0; //define PM10 value of the air detector module

void setup()

{

Serial.begin(9600);

Serial.setTimeout(1500);

}

void loop()

{

if(Serial.find(0x42)){ //start to read when detect 0x42

Serial.readBytes(buf,LENG);

if(buf[0] == 0x4d){

if(checkValue(buf,LENG)){

PM01Value=transmitPM01(buf); //count PM1.0 value of the air detector module

PM2_5Value=transmitPM2_5(buf);//count PM2.5 value of the air detector module

PM10Value=transmitPM10(buf); //count PM10 value of the air detector module

}

}

}

static unsigned long OledTimer=millis();

if (millis() - OledTimer >=1000)

{

OledTimer=millis();

Serial.print("PM1.0: ");

Serial.print(PM01Value);

Serial.println(" ug/m3");

Serial.print("PM2.5: ");

Serial.print(PM2_5Value);

Serial.println(" ug/m3");

Serial.print("PM1 0: ");

Serial.print(PM10Value);

Serial.println(" ug/m3");

Serial.println();

}

}

char checkValue(unsigned char *thebuf, char leng)

{

char receiveflag=0;

int receiveSum=0;

for(int i=0; i<(leng-2); i++){

receiveSum=receiveSum+thebuf[i];

}

receiveSum=receiveSum + 0x42;

if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1])) //check the serial data

{

receiveSum = 0;

receiveflag = 1;

}

return receiveflag;

}

int transmitPM01(unsigned char *thebuf)

{

int PM01Val;

PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module

return PM01Val;

}

//transmit PM Value to PC

int transmitPM2_5(unsigned char *thebuf)

{

int PM2_5Val;

PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module

return PM2_5Val;

}

//transmit PM Value to PC

int transmitPM10(unsigned char *thebuf)

{

int PM10Val;

PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module

return PM10Val;

}

ตัวอย่าง 2. code การทำงานผ่าน Serial monitor และแสดงผลผ่านจอ OLED I2C ใน Arduino IDE

Code Serial monitor and OLED

#include <Arduino.h>

#include <Wire.h>

#include <SPI.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

Adafruit_SSD1306 OLED(-1);

#define LENG 31 //0x42 + 31 bytes equal to 32 bytes

unsigned char buf[LENG];

int PM01Value=0; //define PM1.0 value of the air detector module

int PM2_5Value=0; //define PM2.5 value of the air detector module

int PM10Value=0; //define PM10 value of the air detector module

void setup()

{

Serial.begin(9600);

Serial.setTimeout(1500);

OLED.begin(SSD1306_SWITCHCAPVCC,0x3C);

}

void loop()

{

if(Serial.find(0x42)){ //start to read when detect 0x42

Serial.readBytes(buf,LENG);

if(buf[0] == 0x4d){

if(checkValue(buf,LENG)){

PM01Value=transmitPM01(buf); //count PM1.0 value of the air detector module

PM2_5Value=transmitPM2_5(buf);//count PM2.5 value of the air detector module

PM10Value=transmitPM10(buf); //count PM10 value of the air detector module

}

}

}

static unsigned long OledTimer=millis();

if (millis() - OledTimer >=1000)

{

OledTimer=millis();

Serial.print("PM1.0: ");

Serial.print(PM01Value);

Serial.println(" ug/m3");

Serial.print("PM2.5: ");

Serial.print(PM2_5Value);

Serial.println(" ug/m3");

Serial.print("PM1 0: ");

Serial.print(PM10Value);

Serial.println(" ug/m3");

Serial.println();

OLED.setTextColor(WHITE,BLACK); //ตัวอักษรสีขาว ,ฉากหลังดำ

OLED.clearDisplay(); // ลบหน้าจอ

OLED.setTextSize(1); // ขนาดตัวอักษร

OLED.setCursor(0, 0);

OLED.println(" KLS Dust Sensor");

OLED.setTextSize(1); // ขนาดตัวอักษร

OLED.print(" PM1.0 = ");

OLED.print(PM01Value);

OLED.println(" ug/m3");

OLED.print(" PM2.5 = ");

OLED.print(PM2_5Value);

OLED.println(" ug/m3");

OLED.print(" PM10 = ");

OLED.print(PM10Value);

OLED.println(" ug/m3");

OLED.display(); // แสดงตัวอักษรทั้งหมด

}

}

char checkValue(unsigned char *thebuf, char leng)

{

char receiveflag=0;

int receiveSum=0;

for(int i=0; i<(leng-2); i++){

receiveSum=receiveSum+thebuf[i];

}

receiveSum=receiveSum + 0x42;

if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1])) //check the serial data

{

receiveSum = 0;

receiveflag = 1;

}

return receiveflag;

}

int transmitPM01(unsigned char *thebuf)

{

int PM01Val;

PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module

return PM01Val;

}

//transmit PM Value to PC

int transmitPM2_5(unsigned char *thebuf)

{

int PM2_5Val;

PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module

return PM2_5Val;

}

//transmit PM Value to PC

int transmitPM10(unsigned char *thebuf)

{

int PM10Val;

PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module

return PM10Val;

}

ตัวอย่าง 3. code การทำงานผ่าน Serial monitor แสดงผลผ่านจอ OLED และการใช้งานร่วมกับ Appication Blynk

Code Serial Monitor - OLED-Blynk

#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>

#include <BlynkSimpleEsp8266.h>

#include <Arduino.h>

#include <Wire.h>

#include <SPI.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

Adafruit_SSD1306 OLED(-1);

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

#define LENG 31 //0x42 + 31 bytes equal to 32 bytes

unsigned char buf[LENG];

int PM01Value=0; //define PM1.0 value of the air detector module

int PM2_5Value=0; //define PM2.5 value of the air detector module

int PM10Value=0; //define PM10 value of the air detector module

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

char auth[] = "askfjasasfdsaf"; // กรอก auth ที่ได้มาจาก e-mail

char ssid[] = "xxxxxxxxx"; // กรอกชื่อ wifi

char pass[] = "xxxxxxxxxx"; // กรอกรหัสผ่าน wifi

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

BlynkTimer timer;

void sendSensor()

{

if(Serial.find(0x42)){ //start to read when detect 0x42

Serial.readBytes(buf,LENG);

if(buf[0] == 0x4d){

if(checkValue(buf,LENG)){

PM01Value=transmitPM01(buf); //count PM1.0 value of the air detector module

PM2_5Value=transmitPM2_5(buf);//count PM2.5 value of the air detector module

PM10Value=transmitPM10(buf); //count PM10 value of the air detector module

}

}

}

static unsigned long OledTimer=millis();

if (millis() - OledTimer >=1000)

{

OledTimer=millis();

Serial.print("PM1.0: ");

Serial.print(PM01Value);

Serial.println(" ug/m3");

Serial.print("PM2.5: ");

Serial.print(PM2_5Value);

Serial.println(" ug/m3");

Serial.print("PM1 0: ");

Serial.print(PM10Value);

Serial.println(" ug/m3");

Serial.println();

OLED.setTextColor(WHITE,BLACK); //ตัวอักษรสีขาว ,ฉากหลังดำ

OLED.clearDisplay(); // ลบหน้าจอ

OLED.setTextSize(1); // ขนาดตัวอักษร

OLED.setCursor(0, 0);

OLED.println(" KLS Dust Sensor");

OLED.setTextSize(1); // ขนาดตัวอักษร

OLED.print(" PM1.0 = ");

OLED.print(PM01Value);

OLED.println(" ug/m3");

OLED.print(" PM2.5 = ");

OLED.print(PM2_5Value);

OLED.println(" ug/m3");

OLED.print(" PM10 = ");

OLED.print(PM10Value);

OLED.println(" ug/m3");

OLED.display(); // แสดงตัวอักษรทั้งหมด

Blynk.virtualWrite(V0, PM01Value); // ทำ virtual ที่ v5 โดยรับค่าความชืน

Blynk.virtualWrite(V1, PM2_5Value); // ทำ virtual ที่ v6 โดยรับค่าความอุณหภูมิ

Blynk.virtualWrite(V2, PM10Value);

}

}

char checkValue(unsigned char *thebuf, char leng)

{

char receiveflag=0;

int receiveSum=0;

for(int i=0; i<(leng-2); i++){

receiveSum=receiveSum+thebuf[i];

}

receiveSum=receiveSum + 0x42;

if(receiveSum == ((thebuf[leng-2]<<8)+thebuf[leng-1])) //check the serial data

{

receiveSum = 0;

receiveflag = 1;

}

return receiveflag;

}

int transmitPM01(unsigned char *thebuf)

{

int PM01Val;

PM01Val=((thebuf[3]<<8) + thebuf[4]); //count PM1.0 value of the air detector module

return PM01Val;

}

//transmit PM Value to PC

int transmitPM2_5(unsigned char *thebuf)

{

int PM2_5Val;

PM2_5Val=((thebuf[5]<<8) + thebuf[6]);//count PM2.5 value of the air detector module

return PM2_5Val;

}

//transmit PM Value to PC

int transmitPM10(unsigned char *thebuf)

{

int PM10Val;

PM10Val=((thebuf[7]<<8) + thebuf[8]); //count PM10 value of the air detector module

return PM10Val;

}

//}

void setup()

{

Serial.begin(9600);

Serial.setTimeout(1500);

OLED.begin(SSD1306_SWITCHCAPVCC,0x3C);

Blynk.begin(auth, ssid, pass);

timer.setInterval(1000L, sendSensor);

}

void loop()

{

Blynk.run();

timer.run();

}