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.

*5 WEEK : WiFi Module

For this week, i had search more about the WiFi Module ESP 8266.

The ESP8266 is a low-cost Wi-Fi chip with full TCP/IP stack and MCU (Micro Controller Unit) capability produced by Shanghai-based Chinese manufacturer, Espressif Systems.

The chip first came to the attention of western makers in August 2014 with the ESP-01 module, made by a third-party manufacturer, AI-Thinker. This small module allows microcontrollers to connect to a Wi-Fi network and make simple TCP/IP connections using Hayes-style commands. However, at the time there was almost no English-language documentation on the chip and the commands it accepted. The very low price and the fact that there were very few external components on the module which suggests that it could eventually be very inexpensive in volume, attracted many hackers to explore the module, chip, and the software on it, as well as to translate the Chinese documentation.

The ESP8285 is an ESP8266 with 1 MB of built-in flash, allowing for single-chip devices capable of connecting to Wi-Fi.

This is the datasheet of ESP 8266 with Arduino;

http://rancidbacon.com/files/kiwicon8/ESP8266_WiFi_Module_Quick_Start_Guide_v_1.0.4.pdf

This is one of the video for the beginner of ESP 8266 WiFi Module.

*4 WEEK : SHINYEI Particle Sensor Coding

Now, it time for Particle Sensor. Same as DHT11, i had search the related coding for this sensor. i had found some of the coding. Such like;

/* 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  JST Pin 1 (Black Wire)  => //Arduino GND  JST Pin 3 (Red wire)    => //Arduino 5VDC  JST Pin 4 (Yellow wire) => //Arduino Digital Pin 8  */ int pin = 8; unsigned long duration; unsigned long starttime; unsigned long sampletime_ms = 2000;//sampe 30s ; unsigned long lowpulseoccupancy = 0; float ratio = 0; float concentration = 0; void setup() {   Serial.begin(9600);   pinMode(8,INPUT);   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     Serial.print("concentration = ");     Serial.print(concentration);     Serial.println(" pcs/0.01cf");     Serial.println("\n");     lowpulseoccupancy = 0;     starttime = millis();   } }

By using this coding, i try to build the circuit of this particle sensor, this is the reading on the Serial Monitor of Arduino.

Insyaallah i will modified the output of the program, so that it is easier for user to understand the reading. There is another program that i had found;

/* 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  JST Pin 1 (Black Wire)  => //Arduino GND  JST Pin 3 (Red wire)    => //Arduino 5VDC  JST Pin 4 (Yellow wire) => //Arduino Digital Pin 8  */ int pin = 8; unsigned long duration; unsigned long starttime; unsigned long sampletime_ms = 2000;//sampe 30s ; unsigned long lowpulseoccupancy = 0; float ratio = 0; float concentration = 0; void setup() {   Serial.begin(9600);   pinMode(8,INPUT);   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     Serial.print("concentration = ");     Serial.print(concentration);     Serial.println(" pcs/0.01cf");     Serial.println("\n");     lowpulseoccupancy = 0;     starttime = millis();   } }

This coding was look more simple compare to the previous one. when i try to get the reading by Serial Monitor, it looks more easier for user to understand.

After this i had to find out the coding and the circuit for displaying the reading on the LCD Display.

*4 WEEK : DHT11 Coding and Circuit

So, for this week, i looking for the basic coding for my DHT11, and there it is;

#include <dht.h> #include <LiquidCrystal.h> LiquidCrystal lcd(12, 11, 5, 4, 3, 2); dht DHT; #define DHT11_PIN 7 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 coding is for displaying the reading of DHT11 sensor to LCD Display. n i had build up the circuit but unfortunately there is wrong connection that i made that cause the damage of sensor, which i connect the GND and VSS in wrong port.

The reading displayed was as shown. To double confirm this damage condition of sensor, i had try to run the system on the Arduino and observe the reading on the Serial Monitor of Arduino software.

The reading was remain the same. So i need to find the new DHT11. But i was satisfied, because at least i had knew the basic coding to displaying the reading data of DHT11.

*3 WEEK : DHT11 Coding

For this 3rd week, i had move to find the coding for my project. I start with the Temperature & Humidity Sensor, DHT11. I search to the internet the basic coding for this sensor. Then i had found this coding, which is displaying the reading of sensor.

#include <DHT11.h> #include <Wire.h> #include <LCD.h> #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Addr, En, Rw, Rs, d4, d5, d6, d7, backlighpin, polarity int pin = A0; DHT11 dht11(pin); double Fahrenheit(double celsius) { return ((double)(9 / 5) * celsius) + 32; } double Kelvin(double celsius) { return celsius + 273.15; } void setup() { lcd.begin(16, 2); lcd.backlight(); lcd.clear(); lcd.print("Humidity & temp"); delay(3000); lcd.clear(); lcd.print("Starting....."); delay(3000); } void loop() { int err; float temp, humi; if ((err = dht11.read(humi, temp)) == 0) { lcd.clear(); delay(500); lcd.setCursor(0, 0); lcd.print("Temp"); lcd.setCursor(0, 1); lcd.print("Humidity"); lcd.setCursor(9, 0); lcd.print(temp); lcd.print(" C"); lcd.setCursor(9, 1); lcd.print(humi); lcd.print(" %"); delay(10000); } else { lcd.println(); lcd.print("Error No :"); lcd.print(err); lcd.println(); } }

But then, when i run this coding, there is an error;

The error show that there is some line that Arduino cannot 'read'. This is because Arduino did not have the library.  

              #include <DHT11.h>

I had tried to solve the error by find the library for that coding, but there is no solution :( :( :(
So i had decided to find another coding and try to modified it.

*2 WEEK : Casing for Prototype

For this week i had thinking about the casing or prototype of my project. I had search at the internet, there are perfect casing;

Datec Mobile Box

This Datec Mobile Box is from OKW Gehause Systeme. It look so perfect for my Air Quality Monitoring System, because the shape, the size and the material is perfectly match with the characteristics for my prototype. Moreover there is a ready space for the LCD Display.
But, i found that the price is extremely expensive, which is almost RM 300. Because of that, i decided to get the usual plastic box that more affordable.. Such like;

*1 WEEK : Basic Circuit

For this week, i start to build up the basic circuit for my project. Which is LCD. The coding for this basic circuit is from Arduino Library.

#Display LCD

/*   LiquidCrystal Library - display() and noDisplay()  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal  library works with all LCD displays that are compatible with the  Hitachi HD44780 driver. There are many of them out there, and you  can usually tell them by the 16-pin interface.  This sketch prints "Hello World!" to the LCD and uses the  display() and noDisplay() functions to turn on and off  the display.  The circuit:  * LCD RS pin to digital pin 12  * LCD Enable pin to digital pin 11  * LCD D4 pin to digital pin 5  * LCD D5 pin to digital pin 4  * LCD D6 pin to digital pin 3  * LCD D7 pin to digital pin 2  * LCD R/W pin to ground  * 10K resistor:  * ends to +5V and ground  * wiper to LCD VO pin (pin 3)  Library originally added 18 Apr 2008  by David A. Mellis  library modified 5 Jul 2009  by Limor Fried (http://www.ladyada.net)  example added 9 Jul 2009  by Tom Igoe  modified 22 Nov 2010  by Tom Igoe  This example code is in the public domain.  http://www.arduino.cc/en/Tutorial/LiquidCrystalDisplay  */ // include the library code: #include <LiquidCrystal.h> // initialize the library with the numbers of the interface pins LiquidCrystal lcd(12, 11, 5, 4, 3, 2); void setup() {   // set up the LCD's number of columns and rows:   lcd.begin(16, 2);   // Print a message to the LCD.   lcd.print("AirQualityMonitor"); } void loop() {   // Turn off the display:   lcd.noDisplay();   delay(1000);   // Turn on the display:   lcd.display();   delay(3000); }

#Display LCD 2 Line

/*   LiquidCrystal Library - display() and noDisplay()  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal  library works with all LCD displays that are compatible with the  Hitachi HD44780 driver. There are many of them out there, and you  can usually tell them by the 16-pin interface.  This sketch prints "Hello World!" to the LCD and uses the  display() and noDisplay() functions to turn on and off  the display.  The circuit:  * LCD RS pin to digital pin 12  * LCD Enable pin to digital pin 11  * LCD D4 pin to digital pin 5  * LCD D5 pin to digital pin 4  * LCD D6 pin to digital pin 3  * LCD D7 pin to digital pin 2  * LCD R/W pin to ground  * 10K resistor:  * ends to +5V and ground  * wiper to LCD VO pin (pin 3)  Library originally added 18 Apr 2008  by David A. Mellis  library modified 5 Jul 2009  by Limor Fried (http://www.ladyada.net)  example added 9 Jul 2009  by Tom Igoe  modified 22 Nov 2010  by Tom Igoe  This example code is in the public domain.  http://www.arduino.cc/en/Tutorial/LiquidCrystalDisplay  */ // include the library code: #include <LiquidCrystal.h> // initialize the library with the numbers of the interface pins LiquidCrystal lcd(12, 11, 5, 4, 3, 2); void setup() {   // set up the LCD's number of columns and rows:   lcd.begin(16, 2);   // Print a message to the LCD.   lcd.print("Air Qlty Monitor");   // set the cursor to column 0, line 1   // (note: line 1 is the second row, since counting begins with 0):   lcd.setCursor(0, 1);   // print the number of seconds since reset:   lcd.print("  by Adawiyah"); } void loop() {   // Turn off the display:   lcd.noDisplay();   delay(1000);   // Turn on the display:   lcd.display();   delay(3000); }