reject incomplete measurements

raspberry-pi/sensors.py

@@ -74,8 +74,9 @@ class AcusticSensor:
     value = conn.getAcusticRTTs()
     print("acc: ", value)
 
-    self.calibrate(value)
-    self.pass_to_gui(self.calculate_position(value))
+    if value[0] >= 0 and value[1] >= 0:
+      self.calibrate(value)
+      self.pass_to_gui(self.calculate_position(value))
 
   def calibrate(self, value):