Revision 3:2e06207b1e90, committed 2019-03-07

Comitter:

roycoll

Date:

Thu Mar 07 14:58:39 2019 +0000

Parent:

2:3a61e56476bc

Commit message:

Version 1, Midterm project - Vehicle Air quality warning system/safety system.

Changed in this revision

--- a/main.cpp	Fri Oct 06 09:36:16 2017 +0000
+++ b/main.cpp	Thu Mar 07 14:58:39 2019 +0000
@@ -1,25 +1,44 @@
 #include "mbed.h"
 #include "MQ2.h"
+DigitalOut led(D2);   
+PwmOut PWM1(A5);
+int on = 1, off = 0;   
 
-Serial pc(USBTX, USBRX); // tx, rx
+Serial pc(USBTX, USBRX);                                                        // tx, rx
 MQ2 mq2(A1);                                                                    // Analog Port to read from
-
-int main() {
+int main() 
+{
+    PWM1.period_ms(500); 
+    int x; x=1;
     pc.baud(115200);
     mq2.begin();                                                                // 'Calibrate' sensor
     MQ2_data_t MQ2_data;                                                        // Structure to hold data.
-    while (true) {
-        pc.printf("CO PPM: %.0f\r\n",mq2.readCO());                             // Performs a one shot read of CO
-        pc.printf("Smoke PPM: %.0f\r\n",mq2.readSmoke());                       // Performs a one shot read of Smoke
-        pc.printf("LPG PPM: %.0f\r\n",mq2.readLPG());                           // Performs a one shot read of LPG
-        wait(1);
+    while (true) 
+    {
+        pc.printf("CO PPM: %.0f\r\n",mq2.readCO());                             // Read of CO
+        pc.printf("Smoke PPM: %.0f\r\n",mq2.readSmoke());                       // Read of Smoke
+        pc.printf("LPG PPM: %.0f\r\n",mq2.readLPG());                           // Read of LPG
+        wait(.1);
+        pc.printf("................................\r\n");                      
+      mq2.read(&MQ2_data);                                                      // Alt reading method, reading to structure
+        pc.printf("CO PPM: %.0f\r\n",MQ2_data.co);                              // Return data from structure
+        pc.printf("Smoke PPM: %.0f\r\n",MQ2_data.smoke);                        // Return data from structure
+        pc.printf("LPG PPM: %.0f\r\n",MQ2_data.lpg);                            // Return data from structure
         pc.printf("................................\r\n");                      
-        mq2.read(&MQ2_data);                                                    // Alt reading method, reading to struct
-        pc.printf("CO PPM: %.0f\r\n",MQ2_data.co);                              // Return data from strut
-        pc.printf("Smoke PPM: %.0f\r\n",MQ2_data.smoke);                        // Return data from strut
-        pc.printf("LPG PPM: %.0f\r\n",MQ2_data.lpg);                            // Return data from strut
-        pc.printf("................................\r\n");                      
-        wait(1);
+        wait(.1);
+        if (MQ2_data.co > 300)
+         {
+            led = on; 
+            PWM1.pulsewidth_ms(x); 
+            x=x+1; 
+            wait(.1); 
+         }        
+        else   
+         { 
+         x=0;
+         PWM1.pulsewidth_ms(x);
+         led = off;
+         }
     }
 }