main.cpp

00001 #include "mbed.h"
00002 #include "MQ2.h"
00003 DigitalOut led(D2);   
00004 PwmOut PWM1(A5);
00005 int on = 1, off = 0;   
00006 
00007 Serial pc(USBTX, USBRX);                                                        // tx, rx
00008 MQ2 mq2(A1);                                                                    // Analog Port to read from
00009 int main() 
00010 {
00011     PWM1.period_ms(500); 
00012     int x; x=1;
00013     pc.baud(115200);
00014     mq2.begin();                                                                // 'Calibrate' sensor
00015     MQ2_data_t MQ2_data;                                                        // Structure to hold data.
00016     while (true) 
00017     {
00018         pc.printf("CO PPM: %.0f\r\n",mq2.readCO());                             // Read of CO
00019         pc.printf("Smoke PPM: %.0f\r\n",mq2.readSmoke());                       // Read of Smoke
00020         pc.printf("LPG PPM: %.0f\r\n",mq2.readLPG());                           // Read of LPG
00021         wait(.1);
00022         pc.printf("................................\r\n");                      
00023       mq2.read(&MQ2_data);                                                      // Alt reading method, reading to structure
00024         pc.printf("CO PPM: %.0f\r\n",MQ2_data.co);                              // Return data from structure
00025         pc.printf("Smoke PPM: %.0f\r\n",MQ2_data.smoke);                        // Return data from structure
00026         pc.printf("LPG PPM: %.0f\r\n",MQ2_data.lpg);                            // Return data from structure
00027         pc.printf("................................\r\n");                      
00028         wait(.1);
00029         if (MQ2_data.co > 300)
00030          {
00031             led = on; 
00032             PWM1.pulsewidth_ms(x); 
00033             x=x+1; 
00034             wait(.1); 
00035          }        
00036         else   
00037          { 
00038          x=0;
00039          PWM1.pulsewidth_ms(x);
00040          led = off;
00041          }
00042     }
00043 }
00044