change default railed percentage (#1055)

Signed-off-by: Andrey Parfenov <a1994ndrey@gmail.com>

Author: Andrey1994

OpenBCI_GUI/Extras.pde

@@ -413,11 +413,18 @@ class DataStatus {
             int endPos = data.length;
             int startPos = Math.max(0, endPos - nPoints);
 
+            boolean is_straight_line = true;
+            if (!currentBoard.isStreaming()) {
+                is_straight_line = false;
+            }
             float max = Math.abs(data[startPos]);
-            for (int i = startPos; i < endPos; i++) {
+            for (int i = startPos + 1; i < endPos; i++) {
                 if (Math.abs(data[i]) > max) {
                     max = Math.abs(data[i]);
                 }
+                if ((Math.abs(data[i - 1] - data[i]) > 0.00001) && (Math.abs(data[i]) > 0.00001)) {
+                    is_straight_line = false;
+                }
             }
             percentage = (max / maxVal) * 100.0;
 
@@ -432,7 +439,14 @@ class DataStatus {
                 is_railed = true;
                 notificationString = "Railed " + String.format("%1$,.2f", percentage) + "% ";
                 colorIndicator = red;
+            } else {
+                if (is_straight_line) {
+                    is_railed = true;
+                    notificationString = "Data from the board doesn't change";
+                    colorIndicator = red;
+                }
             }
+
         }
     }
     public color getColor() {

OpenBCI_GUI/OpenBCI_GUI.pde

@@ -140,8 +140,8 @@ int nchan = NCHAN_CYTON; //Normally, 8 or 16.  Choose a smaller number to show f
 //define variables related to warnings to the user about whether the EEG data is nearly railed (and, therefore, of dubious quality)
 DataStatus is_railed[];
 // thresholds are pecentages of max possible value
-final double threshold_railed = 90.0;
-final double threshold_railed_warn = 75.0;
+final double threshold_railed = 99.0;
+final double threshold_railed_warn = 90.0;
 
 //Cyton SD Card setting
 CytonSDMode cyton_sdSetting = CytonSDMode.NO_WRITE;