IFD:PhysicalComp2011/code: Difference between revisions

IFD:PhysicalComp2011/code (view source)

Revision as of 10:44, 13 December 2011

1,665 bytes added , 13 December 2011

→‎12.12.2011 Arduino & Processing sketches

Frederic Gmeiner

213

edits

@@ Line 1,073: / Line 1,073: @@
    delay(10);
 }
+</source>
+<br /> <br />
+=== Va Smoothing Sensor Values ===
+[[File:Arduino_array_smoothing.png|200px|thumb]]
+<source lang="java">
+/* SMOOTHING SENSOR VALUES (ARDUINO)
+ *
+ * Sometimes the values from a sensor variate
+ * around a certain value or have certain peaks
+ * that we need to filter out in order to
+ * work with the signal. For this we can
+ * use an array in which we write the
+ * sensor reaings first and calculate the
+ * average of all values in the array.
+ *
+ * NOTE: This smoothing example is very simple.
+ * There are much better ways of doing this, but
+ * this is the most basic procedure to illustrate
+ * the purpose of a smoothing algorithm.
+ *
+ * Frederic Gmeiner, 2011
+ */
+#include <CapSense.h>
+CapSense   cs_9_2 = CapSense(9,2);
+// vars for smoothing array:
+const int numReadings = 10;
+long capValues[numReadings];
+int index = 0;                  // the index of the current reading
+int total = 0;                  // the running total
+int average = 0;                // the average
+void setup()
+{
+  Serial.begin(9600);
+}
+void loop()
+{
+  capValues[index] = cs_9_2.capSense(30);
+  // reset and recalculate the total:
+  total= 0;
+  for(int i=0; i<numReadings; i++) total += capValues[i];
+  // advance to the next position in the array:
+  index = index + 1;
+   // if we're at the end of the array...
+   // ...wrap around to the beginning:
+  if (index >= numReadings) index = 0;
+  // calculate the average:
+  average = total / numReadings;
+  Serial.println(average);         // print the average
+  delay(10);                       // arbitrary delay to limit data to serial port
+}
 </source>
 <br /> <br />