Bug Fix: Prevent Displaying Temperatures Below 0C

When in Celsius mode with standard ADC, prevent showing temperatures below 0C.  This will prevent probes that are unconnected show a negative temperature on the dashboard.

Author: nebhead

probes/base.py

@@ -172,9 +172,10 @@ def _voltage_to_temp(self, voltage, probe_profile, port=None):
 
 			tempF = tempC * (9/5) + 32 # Celsius to Farenheit
 
-			''' Check bounds for realistic temperature values (0-600F), else report 0F '''
+			''' Check bounds for realistic temperature values (ex. 0-600F, 0-314C), else report 0 '''
 			if (tempF < 0) or (tempF > 600):
 				tempF = 0
+			if (tempC < 0) or (tempC > 314):
 				tempC = 0
 
 		else: