Demo reading two values from serial, plotting them on the same graph

Christopher Stone
1 parent ba381288
Showing 4 changed files with 43 additions and 26 deletions Show diff stats
robots/little_john/telemetry/code/monitor/version1/main.py
robots/little_john/telemetry/code/monitor/version1/plot.py
robots/little_john/telemetry/code/monitor/version1/series.py
robots/little_john/telemetry/code/robot/analogread_demo/analogread_demo.ino
@@ -40,7 +40,7 @@ else:
     os='Other'
 logging.info('OS = ' + os)
  
-testseries = Series(points=150, ylimits=(9, 1024), title="Sine wave demo", xname="Time (s)", yname="100sin(t)")
+testseries = Series(points=150, ylimits=(0, 1024), title="Data from serial", xname="Time (s)", yname="ADC output")
 plots = []
 plots.append(Plot(testseries))
  
@@ -48,13 +48,22 @@ def pollSerial(elapsed):
     """Check serial port for incoming data"""
     # Note: 'elapsed' is time since last call of this function
     # This works, but it might be better for performance to have two seperate functions, only one of which is run.
-    if os=='Windows':
-        values = datafeed.readline().strip().split(b", ")
-    else:
-        values = datafeed.readline().strip()
-        values = values.split(b', ')
+    try:
+        if os=='Windows':
+            values = datafeed.readline().strip().split(b", ")
+        else:
+            values = datafeed.readline().strip()
+            values = values.split(b', ')
+    except:
+        logging.error("Failed to recieve or parse input data")
+        return
+    
     for n, value in enumerate(values):
-        values[n] = float(value)
+        try:
+            values[n] = float(value)
+        except:
+            logging.error("Failed to convert input to float")
+            return
     #logging.info("Recieved data: " + str(values))
     testseries.addpoint([time.time()-starttime] + values)
  
@@ -66,6 +75,6 @@ def fakePollSerial(elapsed):
     testseries.addpoint(values)
  
 # Pyglet looks after the main event loop, but this ensures that data keeps being read in
-pyglet.clock.schedule_interval(pollSerial, 0.04)
+pyglet.clock.schedule_interval(pollSerial, 0.01)
  
 pyglet.app.run()
@@ -40,7 +40,7 @@ class Plot(pyglet.window.Window):
         self.drawHeading()
         self.drawAxis(0)
         self.drawAxis(1)
-        self.drawLine(self.series)
+        self.drawLines(self.series)
  
     def drawBackground(self):
         """Draw the graph background, currently a plain colour"""
@@ -54,7 +54,7 @@ class Plot(pyglet.window.Window):
                             anchor_x='center', anchor_y='top')
         heading.draw()
  
-    def drawLine(self, series):
+    def drawLines(self, series):
         xscale = float(self.series.xlimits[1]-self.series.xlimits[0])/(self.bounds[0][1]-self.bounds[0][0])
         yscale = float(self.series.ylimits[1]-self.series.ylimits[0])/(self.bounds[1][1]-self.bounds[1][0])
         lmar = int(self.width * self.margins[0])
@@ -63,17 +63,24 @@ class Plot(pyglet.window.Window):
         bmar = int(self.height * self.margins[1])
  
         pyglet.gl.glLineWidth(2)
-                
-        for n in range(len(series.data) - 1):
-            x1, y1 = series.data[n][0]-series.xlimits[0], series.data[n][1]-series.ylimits[0]
-            x2, y2 = series.data[n+1][0]-series.xlimits[0], series.data[n+1][1]-series.ylimits[0]
-            x1 = int((x1/xscale)+lmar)
-            y1 = int((y1/yscale)+bmar)
-            x2 = int((x2/xscale)+lmar)
-            y2 = int((y2/yscale)+bmar)
-            pyglet.graphics.draw(2, pyglet.gl.GL_LINES,
-                                 ('v2i', (x1, y1, x2, y2)),
-                                 ('c3B', (255, 0, 0, 255, 0, 0)))
+        
+        linecolours = [(255, 0, 0, 255, 0, 0), (0, 0, 255, 0, 0, 255)]
+    
+        try:
+            for m in range(len(series.data[0])-1):
+                for n in range(len(series.data) - 1):
+                    x1, y1 = series.data[n][0]-series.xlimits[0], series.data[n][m+1]-series.ylimits[0]
+                    x2, y2 = series.data[n+1][0]-series.xlimits[0], series.data[n+1][m+1]-series.ylimits[0]
+                    x1 = int((x1/xscale)+lmar)
+                    y1 = int((y1/yscale)+bmar)
+                    x2 = int((x2/xscale)+lmar)
+                    y2 = int((y2/yscale)+bmar)
+                    pyglet.graphics.draw(2, pyglet.gl.GL_LINES,
+                                        ('v2i', (x1, y1, x2, y2)),
+                                        ('c3B', linecolours[m]))
+        except:
+            logging.error("Failed to plot lines, possibly due to corrupt/missing data. (This happens at startup)")
+            
         pyglet.gl.glLineWidth(1)
  
  
@@ -32,8 +32,11 @@ class Series:
         self.data.append(point)
         if len(self.data) > self.points:
             del self.data[0]
-        self.autoscale(0)
-            
+        try:
+            self.autoscale(0)
+        except:
+            logging.error("Series autoscale failed")
+         
     def autoscale(self, axis): # axis=0 is x, 1 is y
         minval = self.data[0][axis]
         maxval = self.data[0][axis]
@@ -6,7 +6,6 @@
  * This code is under the GPL
  */
  
-#include <math.h>
 #include <SoftwareSerial.h>
  
 SoftwareSerial Bluetooth(3, 2); // Rx, Tx
@@ -14,7 +13,6 @@ SoftwareSerial Bluetooth(3, 2); // Rx, Tx
 void setup() {
   Serial.begin(9600);
   Bluetooth.begin(115200);
-  //Bluetooth.print("Hello, wireless world!");
   pinMode(13, OUTPUT);
 }
  
@@ -25,5 +23,5 @@ void loop() {
   Bluetooth.print(a0value);
   Bluetooth.print(", ");
   Bluetooth.println(a7value);
-  delay(500);
+  delay(100);
 }