Fixing threading, dot rendering

kiln/Adafruit_alphanumeric.py

@@ -173,23 +173,49 @@ class AlphaScroller(threading.Thread):
     def __init__(self, address=0x70, interval=.25):
         self.interval = interval
         self.disp = Alphanumeric(address)
+        self.text = "    "
+        self.counter = 0
+
         super(AlphaScroller, self).__init__()
-        self.value = "    "
+        self.daemon = True
-        self.counter = 0
+        self.running = True
+
+    def stop(self):
+        self.running = False
     
-    def set_text(self, text, pad=True):
+    def set_text(self, text, pad=True, reset=True):
-        self.text = text
+        i = 0
+        self.text = []
+        while i < len(text)-1:
+            if text[i+1] == ".":
+                i+= 1
+                self.text.push((text[i], True))
+            else:
+                self.text.push((text[i],))
+            i+= 1
+
         if pad:
-            self.text += "   "
+            self.text += [(' ',)]*4
-        self.counter = 0
+
+        if reset:
+            self.counter = 0
     
     def set_speed(self, interval):
         self.interval = interval
     
     def run(self):
-        while True:
+        while self.running:
             for i in range(4):
                 char = self.value[(self.counter+i) % len(self.value)]
                 self.disp.writeChar(i, char)
             time.sleep(self.interval)
             self.counter += 1
+
+if __name__ == "__main__":
+    scroller = AlphaScroller()
+    scoller.set_text(list("Hello. World.")+["cone","degree"])
+    scroller.start()
+    try:
+        scroller.join()
+    except KeyboardInterrupt:
+        scroller.stop()

kiln/thermo.py

@@ -25,6 +25,7 @@ class Monitor(threading.Thread):
         self.display.start()
         super(Monitor, self).__init__()
         self.daemon = True
+        self.running = True
 
     def _read_temp(self):
         with open(self.device, 'r') as f:
@@ -39,12 +40,16 @@ class Monitor(threading.Thread):
         if match is not None:
             return float(match.group(1)) / 1000.0
 
+    def stop(self):
+        self.running = False
+        self.display.stop()
+
     @property
     def temperature(self):
         return self.history[-1][1]
 
     def run(self):
-        while True:
+        while running:
             temp = self._read_temp()
             fahr = temp * 9. / 5. + 32.
             now = datetime.datetime.now()
@@ -55,9 +60,12 @@ class Monitor(threading.Thread):
             if 600 <= temp:
                 text += [' ', ' ', 'cone']+list("%0.1f"%temp_to_cone(temp))
             text += '    '
-            self.display.text = text
+            self.display.set_text(text, reset=False)
 
 if __name__ == "__main__":
     mon = Monitor()
     mon.start()
-    mon.join()
+    try:
+        mon.join()
+    except KeyboardInterrupt:
+        mon.stop()