Diff: sci_sensor.cpp

Revision:

2:2a3d5370d769

Parent:

1:ad071d4ef366

--- a/sci_sensor.cpp	Mon Nov 09 17:32:44 2020 +0000
+++ b/sci_sensor.cpp	Mon Nov 09 17:44:05 2020 +0000
@@ -2,32 +2,29 @@
 
 sci_sensor::sci_sensor(PinName in1, PinName in2): _in1(in1), _in2(in2)
 {
+    // Variables used the convert the temperature to celcius.
     c1 = -1481.96;
     c2 = 2196200;
     c3 = 1.8636;
     c4 = 0.00000388;
     
+    // Variables used to conver the photocell data to lux.
     la = -2;
     lb = 3.8062;
 }
 
-//sci_sensor::LM20(PinName in2): _in2(in2)
-//{
-
-//}
-
-float sci_sensor::temp()
+float sci_sensor::temp() // Function to return the temperature in celcius.
 {
-    float volt = _in1.read()*3.3;
-    float T = c1+sqrt(c2 + (c3-volt)/c4);
-    return T;
+    float volt = _in1.read()*3.3; // Converting the reading to voltage.
+    float T = c1+sqrt(c2 + (c3-volt)/c4); // Converting the voltage to celcius.
+    return T; // Returns the temperature in celcius.
 
 }
 
-float sci_sensor::phc()
+float sci_sensor::phc() // Function to return the illuminensce in lux.
 {
-    float volt = _in2.read()*3.3;
-    float res = (3.3*3300/volt - 3300)/1000.00; // 3300 is the resistance of my resistor
-    float lux = pow(10, la*log10(res)+lb); // A and B values were found using the graph for lux vs. resistance
+    float volt = _in2.read()*3.3; // Converts raw data to voltage.
+    float res = (3.3*3300/volt - 3300)/1000.00; // 3300 is the resistance of my resistor. This function converts voltage to resistance of the photocell.
+    float lux = pow(10, la*log10(res)+lb); // Converts the resistance to lux.
     return lux;
 }
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