bug fixes, combined accelerometer tests into seperate file

Author: evannoyes

arduino/accelerometer.h

@@ -0,0 +1,10 @@
+int convertToReading(int maxScale, float g);
+
+float getMaxG();
+
+void testAccelerometerReading();
+
+void testConvertToReading();
+
+void testGetMaxG();
+

arduino/accelerometerTests.ino

@@ -0,0 +1,69 @@
+#include "accelerometer.h"
+
+void testAccelerometerReading() {
+  Serial.println("Testing accelerometer reading...");
+  int16_t x, y, z;
+  int resultX, resultY, resultZ = 0;
+
+  for (int i = 0; i < 10; i++) {
+    xl.readAxes(x, y, z);
+    if (x) {
+      resultX = 1;
+    }
+    if (y) {
+      resultY = 1;
+    }
+    if (z) {
+      resultZ = 1;
+    }
+  }
+
+  if (resultX && resultY && resultZ) {
+    Serial.println("passed");
+  } else {
+    Serial.println("FAILED");
+  }
+}
+
+void testConvertToReading() {
+  int seed = analogRead(7); //uses stray voltage from unused pin to get "true" random number
+  randomSeed(seed);
+  bool passed = true;
+
+  Serial.println("Testing convertToReading()...");
+  
+  for(int i = 0; i < 10; i++) {
+    int rand = random();
+    float g = xl.convertToG(scale, rand);
+    int reading = convertToReading(scale, g);
+    if (reading != rand) {
+      passed = false;
+    }
+  }
+
+  if (passed) {
+      Serial.println("passed");
+  } else {
+      Serial.println("FAILED");
+  }
+}
+
+void testGetMaxG() { //assumes device is at rest, may fail if device is currently accelerating/decelerating
+  Serial.println("Testing getMaxG()...");
+
+  float avgMaxG = 0;
+  int numTests = 10;
+  
+  for(int i = 0; i < numTests; i++) {
+    while(!(xl.newXData() || xl.newYData() || xl.newZData())){}
+    avgMaxG += getMaxG();
+  }
+  
+  avgMaxG /= numTests;
+  
+  if (avgMaxG < 5.0 && avgMaxG >= 0.0) {
+    Serial.println("passed");
+  } else {
+    Serial.println("FAILED");
+  }
+}