fixit

main.js

@@ -16,7 +16,7 @@ setInterval(function() {
 }, 500);
 
 function createTimeline() {
-  var chart = new SmoothieChart({grid:{fillStyle:'transparent'}});
+  var chart = new SmoothieChart({grid:{fillStyle:'transparent'}, labels:{fillStyle:'#000000'}});
   chart.addTimeSeries(random, { strokeStyle: 'rgba(0, 0, 0, 1)', fillStyle: 'rgba(0, 0, 0, 0.1)', lineWidth: 4 });
   chart.streamTo(document.getElementById("chart"), 500);
 }

main.py

@@ -110,6 +110,8 @@ def stream(dev):
     with serial.Serial(dev, timeout=1) as s:
         while True:
             temperature = s.readline().decode().strip()
+            if not temperature:
+                continue
             print("temperature", temperature)
             temps.append(temperature)