Minor updates and fix in examples

Author: jaenrig-ifx

examples/serial-alarm/serial-alarm.ino

@@ -9,6 +9,8 @@
  * communication issues.
  */
 #define I2C_FREQ_HZ     400000  
+#define PERIODIC_MEAS_INTERVAL_IN_SECONDS  10 
+#define ALARM_PPM_THRESHOLD  1200
 
 uint8_t interrupt_pin = 9;      /* For XMC2Go. Change it for your hardware setup */
 
@@ -58,10 +60,10 @@ void setup()
     /*
     * Periodic measurement every 10 seconds.
     * Interrupt alarm when the CO2 value 
-    * goes over 25000 ppm. The isr function is 
+    * goes over 1200 ppm. The isr function is 
     * passed enabling the sensor interrupt mode.
     */
-    err = cotwo.startMeasure(10, 1200, isr);
+    err = cotwo.startMeasure(PERIODIC_MEAS_INTERVAL_IN_SECONDS, ALARM_PPM_THRESHOLD, isr);
     if(XENSIV_PASCO2_OK != err)
     {
       Serial.print("start measure error: ");

examples/serial-forced-compensation/serial-forced-compensation.ino

@@ -48,6 +48,26 @@ void setup()
       Serial.println(err);
     }
 
+  err = cotwo.setPressRef(PRESSURE_REFERENCE);
+  if (XENSIV_PASCO2_OK != err)
+  {
+    Serial.print("pressure reference error: ");
+    Serial.println(err);
+  }
+
+    Serial.print("forced compensation started with ");
+    Serial.print(FORCED_COMPENSATION_CO2_REFERENCE);
+    Serial.println(" ppm baseline reference ...");
+
+    err = cotwo.performForcedCompensation(FORCED_COMPENSATION_CO2_REFERENCE);
+    if (XENSIV_PASCO2_OK != err)
+    {
+      Serial.print("forced compensation error: ");
+      Serial.println(err);
+    }
+
+    Serial.println("forced compensation finished");
+
     /*
       * Configure the sensor to measureme periodically 
       * every 10 seconds
@@ -65,8 +85,6 @@ void loop()
     /* Wait for the value to be ready. */
     delay(PERIODIC_MEAS_INTERVAL_IN_SECONDS*1000);
 
-    co2ppm = 0;
-
     err = cotwo.getCO2(co2ppm);
     if(XENSIV_PASCO2_OK != err)
     {
@@ -98,22 +116,4 @@ void loop()
       Serial.print("pressure reference error: ");
       Serial.println(err);
     }
-
-    err = cotwo.performForcedCompensation(FORCED_COMPENSATION_CO2_REFERENCE);
-    if(XENSIV_PASCO2_OK != err)
-    {
-      Serial.print("forced compensation error: ");
-      Serial.println(err);
-    }
-
-    /*
-     * Restart, as after performForcedCompensation function
-     * the sensor returns to IDLE mode.
-     */
-    err = cotwo.startMeasure(PERIODIC_MEAS_INTERVAL_IN_SECONDS);
-    if(XENSIV_PASCO2_OK != err)
-    {
-      Serial.print("start measure error: ");
-      Serial.println(err);
-    }
 }

examples/serial-single-shot/serial-single-shot.ino

@@ -55,8 +55,6 @@ void loop()
   /* Wait for the value to be ready. */
   delay(5000);
 
-  co2ppm = 0;
-
   /**
    *  getCO2() is called until the value is 
    *  available.