Category: Troubleshooting

If you are stuck, don’t spend days running around alone—ask for help. One of the best things about Arduino is its community. You can always find help if you can describe your problem well. Get into the habit of cutting and pasting things into a search engine and see whether somebody is talking about it. For…

Connect your Arduino Uno to your computer via a USB cable. Open the Device Manager by clicking the Start menu, right-clicking Computer (Vista) or My Computer (XP), and choosing Properties. On Windows XP, click Hardware and choose Device Manager. On Vista, click Device Manager (it appears in the list of tasks on the left of the…

If you get an error when you double-click the Arduino icon, or if nothing happens, try double-clicking the Arduino.exe file as an alternative method to launch Arduino. Windows users may also run into a problem if the operating system assigns a COM port number of COM10 or greater to Arduino. If this happens, you can usually convince…

Sometimes the Found New Hardware Wizard fails to locate the proper driver. In this case you might have to manually tell it where the driver is located. The Found New Hardware Wizard will first ask you whether to check Windows Update; select the “No, not at this time” option and click Next. On the next…

Another important rule is to find a reliable way to reproduce a problem. If your circuit behaves in a funny way at random times, try really hard to identify what seems to cause this. Does it happen only when you press a switch? Only when an LED lights up? Whenever you move a jumper? (Many…

The next step is to check for short circuits between 5V and GND on your project. Connect your Arduino to your breadboard by running a jumper from the 5V and GND connections to the positive and negative rails of the breadboard. (Notice we are following the “divide and rule” principle by connecting only these two…

Before trying very complicated experiments, it’s wise to check the simple things, especially if they don’t take much time. The first thing to check is that your Arduino board works, and the very first example, Blink, is always a good place to start, because you are probably most familiar with it, and because the LED…

While investigating, test each component separately so that you can be absolutely certain that each one works by itself. You will gradually build up confidence about which parts of a project are doing their job and which ones are dubious. The best way to do this is using the built-in examples, as they are unlikely…

The ancient Romans used to say divide et impera: divide and rule. Try to break down (at least mentally, and even better by sketching) the project into its components by using the understanding you have and figure out where the responsibility of each component or part of your program begins and ends.