Diff: MQ135.cpp

Revision:

0:59011d343342

Child:

1:8944058d8e95

diff -r 000000000000 -r 59011d343342 MQ135.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MQ135.cpp	Fri Jun 16 15:01:55 2017 +0000
@@ -0,0 +1,65 @@
+#include "MQ135.h"
+#include "mbed.h"
+
+MQ135::MQ135(PinName pin) : _pin(pin) {
+    _pin = A0;
+   
+}
+void MQ135::initialize(){
+    mqR = 22000;
+    rO = 41763;
+    a = 116.6020682;
+    b = -2.769034857;
+    adc_limit = 65535;
+    }
+float MQ135::getPPM() {
+     Serial pc(USBTX,USBRX);
+    float adcRaw=_pin.read_u16();
+    pc.printf("adc: %f\n\r", adcRaw);
+
+    rS = ((adc_limit  * mqR) / adcRaw) - mqR;
+    pc.printf("Rs: %d\n\r", rS);
+    rSrO = (float)rS / (float)rO;
+    pc.printf("RsrO: %f\n\r", rSrO);
+    float ppm = a * pow(rSrO, b);
+    pc.printf("ppm: %f\n\r", ppm);
+    return ppm;
+}
+int MQ135::air_quality(){
+     Serial pc(USBTX,USBRX);
+     float adcRaw=_pin.read_u16()/64;
+    //Aire limpio
+    if(adcRaw <= 55){
+        pc.printf("Aire limpio \n\r");
+        pc.printf("\n\r");
+        return 0;
+        }
+        
+    //Dioxido de carbono bajo (Respiracion humana)
+    if( adcRaw >= 56 && adcRaw <= 73){
+        pc.printf("Aire con un poco de CO2 \n\r");
+        pc.printf("\n\r");
+        return 1;
+        }
+        
+    //Dioxido de carbono
+    if( adcRaw >= 74 && adcRaw <= 350){
+        pc.printf("Dioxido de carbono CO2 \n\r");
+        pc.printf("\n\r");
+        return 2;
+        }
+        
+    //Gas propano y butano
+    if(adcRaw >= 400){
+        pc.printf("Propano butano \n\r");
+        pc.printf("\n\r");
+        return 3;
+        }
+}
+long MQ135::getRs(){
+    return rS;
+}
+    
+float MQ135::getRsRo(){
+    return rSrO;
+}
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