add try exception for error

python/voltage.py

@@ -21,9 +21,9 @@ if __name__ == "__main__":
     bus = 1
     address = 0x40
 
+  try:  
   # Create library object using  Extended Bus I2C port
     i2c_bus = I2C(bus) # 1 Device is /dev/i2c-1
-   
     ina219 = INA219(i2c_bus, address)
    
 #   print("ina219 test")
@@ -37,12 +37,8 @@ if __name__ == "__main__":
     bus_voltage = ina219.bus_voltage  # voltage on V- (load side)
     shunt_voltage = ina219.shunt_voltage  # voltage between V+ and V- across the shunt
 #    current = ina219.current  # current in mA
-
-    # INA219 measure bus voltage on the load side. So PSU voltage = bus_voltage + shunt_voltage
+# INA219 measure bus voltage on the load side. So PSU voltage = bus_voltage + shunt_voltage
     print("{:6.3f}".format(bus_voltage + shunt_voltage))
-#    print("Shunt Voltage: {:9.6f} V".format(shunt_voltage))
-#    print("Load Voltage:  {:6.3f} V".format(bus_voltage))
-#    print("Current:       {:9.1f} mA".format(current))
-#    print("")
 
-#   time.sleep(2)
+   exception:
+    printf("0 Error\n")