Hardware components | |||||
|
Software apps and online services | |||||
Story
A project completed to measure the air condition in a diesel polluted building. Then the final design enclosed in a wooden box to demonstrate its function to apprentices for inspiration for their projects.
testing
testing sensitivity to fumes using a permanent marker pen
running off batteries
new home
glue plus alterations
almost done
Schematics
Code
//*************************************************************************** // This is a library for the CCS811 air // This sketch reads the sensor // Designed specifically to work with the Adafruit CCS811 breakout // ----> http://www.adafruit.com/products/3566 // These sensors use I2C to communicate. The device's I2C address is 0x5A #include <SD.h> // sd card #include <Wire.h> #include "RTClib.h" // real time clock #include <DHT.h> // load lib dht11 #include "Adafruit_CCS811.h" #include "Arduino.h" #include "LiquidCrystal_PCF8574.h" #define LCD_ADDRESS 0x27 // Define LCD characteristics #define LCD_ROWS 4 #define LCD_COLUMNS 20 #define SCROLL_DELAY 150 #define BACKLIGHT 255 // object initialization #define dht_apin 2 #define dht_type DHT11 int n = 1; int val; // A simple data logger for the Arduino analog pins #define LOG_INTERVAL 1000 // mills between entries (reduce to take more/faster data) // how many milliseconds before writing the logged data permanently to disk // set it to the LOG_INTERVAL to write each time (safest) // set it to 10*LOG_INTERVAL to write all data every 10 datareads, you could lose up to // the last 10 reads if power is lost but it uses less power and is much faster! #define SYNC_INTERVAL 10000 // mills between calls to flush() - to write data to the card 600000 = 10 minutes uint32_t syncTime = 0; // time of last sync() RTC_DS1307 RTC; // define the Real Time Clock object const int chipSelect = 10; // for the data logging shield, we use digital pin 10 for the SD cs line DHT dht(dht_apin, dht_type); // sensor pin S to pin11 LiquidCrystal_PCF8574 lcdI2C; Adafruit_CCS811 ccs; File logfile; void error(char *str) { Serial.print(F("error: ")); Serial.println(str); } void setup() { Serial.begin(9600); // initialize the SD card Serial.print(F("Initializing SD card...")); // make sure that the default chip select pin is set to // output, even if you don't use it: pinMode(10, OUTPUT); // see if the card is present and can be initialized: if (!SD.begin(chipSelect)) { error("Card failed, or not present"); } Serial.println(F("card initialized.")); // create a new file char filename[] = "LOGGER00.CSV"; for (uint8_t i = 0; i < 100; i++) { filename[6] = i/10 + '0'; filename[7] = i%10 + '0'; if (! SD.exists(filename)) { // only open a new file if it doesn't exist logfile = SD.open(filename, FILE_WRITE); break; // leave the loop! } } if (! logfile) { error("couldnt create file"); } Serial.print(F("Logging to: ")); Serial.println(filename); // connect to RTC Wire.begin(); if (!RTC.begin()) { logfile.println("RTC failed"); #if ECHO_TO_SERIAL Serial.println(F("RTC failed")); #endif //ECHO_TO_SERIAL } logfile.println("datetime,co2 ,tvoc ,Humidity ,Temperature "); //#if ECHO_TO_SERIAL // Serial.println("..........,......,datetime,.....,......,......"); //#endif //ECHO_TO_SERIAL // If you want to set the aref to something other than 5v analogReference(EXTERNAL); lcdI2C.begin(LCD_COLUMNS, LCD_ROWS, LCD_ADDRESS, BACKLIGHT); Serial.println(F("CCS811 test")); lcdI2C.print(" CCS811 test" ); lcdI2C.setCursor (0,1); lcdI2C.print(" warming up" ); lcdI2C.setCursor (0,2); lcdI2C.print("data logger file No." ); lcdI2C.setCursor (0,3); lcdI2C.println(filename); if(!ccs.begin()){ Serial.println(F("Failed to start sensor! Please check your wiring.")); while(1); } //calibrate temperature sensor while(!ccs.available()); float temp = ccs.calculateTemperature(); ccs.setTempOffset(temp - 25.0); delay(10000); // wait for 10 seconds lcdI2C.clear(); // Clear LCD screen. } void loop() { float h = dht.readHumidity(); float f = dht.readTemperature(); if(ccs.available()){ float temp = ccs.calculateTemperature(); if(!ccs.readData()){ DateTime now; delay((LOG_INTERVAL -1) - (millis() % LOG_INTERVAL)); // delay for the amount of time we want between readings now = RTC.now(); // fetch the time int H = now.hour(); // Get the hours right now and store them in an integer called h int M = now.minute(); // Get the minutes right now and store them in an integer called m int S = now.second(); // Get the seconds right now and store them in an integer called s logfile.print(now.year(), DEC); logfile.print("/"); logfile.print(now.month(), DEC); logfile.print("/"); logfile.print(now.day(), DEC); logfile.print(" "); if (H<10){ // Add a zero, if necessary, as above logfile.print(0); } logfile.print(now.hour(), DEC); logfile.print(":"); if (M<10){ // Add a zero, if necessary, as above logfile.print(0); } logfile.print(now.minute(), DEC); logfile.print(":"); if (S<10){ // Add a zero, if necessary, as above logfile.print(0); } logfile.print(now.second(), DEC); logfile.print('"'); Serial.print('"'); Serial.print(now.year(), DEC); Serial.print("/"); Serial.print(now.month(), DEC); Serial.print("/"); Serial.print(now.day(), DEC); Serial.print(" "); if (H<10){ // Add a zero, if necessary, as above Serial.print(0); } Serial.print(now.hour(), DEC); Serial.print(":"); if (M<10){ // Add a zero, if necessary, as above Serial.print(0); } Serial.print(now.minute(), DEC); Serial.print(F(":")); if (S<10){ // Add a zero, if necessary, as above Serial.print(0); } Serial.print(now.second(), DEC); Serial.print(F(" ")); Serial.print(F("CO2: ")); Serial.print(ccs.geteCO2()); Serial.print(F("ppm, TVOC: ")); Serial.print(ccs.getTVOC()); Serial.print(F("ppb Temp:")); Serial.println(f); // temp from dht11 lcdI2C.setCursor (0,0); lcdI2C.print ("CO2 "); lcdI2C.setCursor (5,0); lcdI2C.print (" "); lcdI2C.setCursor (5,0); lcdI2C.print(ccs.geteCO2()); // Print print String to LCD on first line lcdI2C.setCursor (0,1); // Set cursor at the begining of line 2 lcdI2C.print ("tVOC "); lcdI2C.print(ccs.getTVOC()); // Print print String to LCD on second line lcdI2C.print (" "); lcdI2C.setCursor (12,1); if (H<10){ // Add a zero, if necessary, as above lcdI2C.print(0); } lcdI2C.print(now.hour(), DEC); lcdI2C.print (":"); if (M<10){ // Add a zero, if necessary, as above lcdI2C.print(0); } lcdI2C.print(now.minute(), DEC); lcdI2C.print (":"); if (S<10){ // Add a zero, if necessary, as above lcdI2C.print(0); } lcdI2C.print(now.second(), DEC); lcdI2C.setCursor (0,2); lcdI2C.print ("Humidity ="); // print on the lcd Humidity = lcdI2C.print(h); // to print the humidity lcdI2C.print("% "); //print "percentage" symbol lcdI2C.setCursor (0,3); lcdI2C.print("Temperature ="); // print on the lcd temp = lcdI2C.print (f); // print on the lcd temperture lcdI2C.print((char)223); // print "degrees" symbol lcdI2C.print("C"); // print "C" with spaces after to fill 20 character line logfile.print(", "); logfile.print(ccs.geteCO2()); logfile.print(","); logfile.print(ccs.getTVOC()); logfile.print(","); logfile.print(h); logfile.print(","); logfile.print(f); logfile.println(); // Now we write data to disk! Don't sync too often - requires 2048 bytes of I/O to SD card // which uses a bunch of power and takes time if ((millis() - syncTime) < SYNC_INTERVAL) return; syncTime = millis(); // blink LED to show we are syncing data to the card & updating FAT! logfile.flush(); } else{ Serial.println(F("ERROR!")); while(1); } } }
