Author Topic: Problem when opening Serial Monitor (Arduino)  (Read 2760 times)

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Offline santidrTopic starter

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Problem when opening Serial Monitor (Arduino)
« on: February 20, 2014, 07:55:20 PM »
Hi guys! i came here because y need your help, here's what happens:

I format my pc last weekend so now i'm installing everything again, and one of the sofrwares i had to re install is arduino, and thats what i did

I conected my Arduino mega, using the usb, then i installed the drivers, and then i tried to test one of my old basic programs, to test a sensor, here is the program:
Code: [Select]
void setup()
void loop()
  Serial.println(digitalRead(2)); // print the data from the sensor

It runs properly, but the problem came when i try to open the Serial Monitor, in order to see whether the sensor is detecting something or not... and thats what i get:

Exception in thread "EventThread COM3" java.lang.NullPointerException
   at jssc.SerialPort$

If you have some idea of how to solve it, i will really apreciate it!!!!

Offline jwatte

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Re: Problem when opening Serial Monitor (Arduino)
« Reply #1 on: February 21, 2014, 10:37:48 AM »
Check if the COM port is another number, and change it in the settings.
If it's not that, perhaps it's a permission issue; try re-launching Arduino IDE as administrator.


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