WEEK 6 : Coding Update

This is the confirm coding for DHT11 sensor that i will used for my air quality monitoring system.

#include <dht.h> #include <LiquidCrystal.h> LiquidCrystal lcd(12, 11, 5, 4, 3, 2); dht DHT; #define DHT11_PIN 6 void setup(){   lcd.begin(16, 2); } void loop() {   int chk = DHT.read11(DHT11_PIN);   lcd.setCursor(0,0);   lcd.print("Temp: ");   lcd.print(DHT.temperature);   lcd.print((char)223);   lcd.print("C");   lcd.setCursor(0,1);   lcd.print("Humidity: ");   lcd.print(DHT.humidity);   lcd.print("%");   delay(1000); }

This is the correct output of this sensor.

The picture below show when there is the heat.

Then, below show the confirm coding for Shinyei Particle Sensor.

/*  Connection:  JST Pin 1 (Black Wire)  => Arduino GND  JST Pin 3 (Red wire)    => Arduino 5VDC  JST Pin 4 (Yellow wire) => Arduino Digital Pin 8  Green Led connected to Arduino D6  Yellow Led connected to Arduino D7  Red Led connected to Arduino D9 Dust Sensor possible application: - Applications of customer - Air quality sensor - Dustlessness workshop - Cigarette detector */ /* Sensor is to create Digital (Lo Pulse) output to Particulate Matters (PM). Lo Pulse Occupancy time (LPO time) is in proportion to PM concentration. The output is for PM whose size is around 1 micro meter or larger. We can use the sensor to detect the dust in clean room. Minimum detect particle: 1um http://www.seeed studio.com/wiki/Grove_-_Dust_Sensor  Grove - Dust Sensor Demo v1.0  Interface to Shinyei Model PPD42NS Particle Sensor  Program by Christopher Nafis  Written April 2012  http://www.seeedstudio.com/depot/grove-dust-sensor-p-1050.html  http://www.sca-shinyei.com/pdf/PPD42NS.pdf  */ #include <LiquidCrystal.h> LiquidCrystal lcd(12, 11, 5, 4, 3, 2); int pin = 6; unsigned long duration; unsigned long starttime; unsigned long sampletime_ms = 1000;//sampe 1s ; unsigned long lowpulseoccupancy = 0; float ratio = 0; float concentration = 0; int gLed = 6; int yLed = 7; int rLed = 9; void setup() {   lcd.begin(16,2);   pinMode(8,INPUT);   pinMode(gLed,OUTPUT);   pinMode(yLed,OUTPUT);   pinMode(rLed,OUTPUT);   starttime = millis();//get the current time; } void loop() {   duration = pulseIn(pin, LOW);   lowpulseoccupancy = lowpulseoccupancy+duration;   if ((millis()-starttime) > sampletime_ms)//if the sampel time == 30s   {     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     lcd.print("concentration = ");     lcd.print(concentration);     if (concentration < 1.0) {      lcd.println("It's a smokeless and dustless environment");      digitalWrite(gLed, HIGH);      digitalWrite(yLed, LOW);      digitalWrite(rLed, LOW);   }     if (concentration > 1.0 && concentration < 20000) {     lcd.println("It's probably only you blowing air to the sensor :)");      digitalWrite(gLed, HIGH);      digitalWrite(yLed, LOW);      digitalWrite(rLed, LOW);     }         if (concentration > 20000 && concentration < 315000) {      lcd.println("Smokes from matches detected!");      digitalWrite(gLed, LOW);      digitalWrite(yLed, HIGH);      digitalWrite(rLed, LOW);     }       if (concentration > 315000) {     lcd.println("Smokes from cigarettes detected! Or It might be a huge fire! Beware!");      digitalWrite(gLed, LOW);      digitalWrite(yLed, LOW);      digitalWrite(rLed, HIGH);   }         lowpulseoccupancy = 0;     starttime = millis();   } }

I had to modified this coding, so that it will be easier for user to get the data.