On a project with a DHT11, a Display 16x2 and an Arduino One R3, I have done a short circuit and, averything stopped working.
Anyone can advise me on a way to test what parts got defective? DHT11? Display? Arduino?
If the Arduino is defective (as it seems) is it possible that the ATmega328P is Ok? How may I test it?
Thank you guys!
Disconnect everything and try loading the blink example. If that doesn't work you need a new Arduino to try checking the other parts.
Disconnect everything.
Run the simple blink sketch , the L LED will flash.
Thank's !!!
I have done it and it does not upload de code.
When connected to the PC via USB cable, it is recognized by the PC as being online but than the upload is not done.
1 - Is there any way to test just the ATmega chip?
2 - For testing the other components, is there a risk of one of them being defective and damage the new Arduino?
You could try replacing the 328 but then you might damage that controller.
If the cables are okay and the USB port can be used with other devices, you need a new Arduino.
Try burning the bootloader.
If this does not work and you have access to a second Arduino, try programming it via ISCP.
Depending on where the short circuit happened, you may still power your Arduino using the Vin pin applying 6.5V-12V. If the voltage regulator was fried you can try applying 5V (but not more!) to the 5V pin.
You can build a functioning Arduino with the ATmega328P chip following the instructions on https://www.gammon.com.au/breadboard or elsewhere on the Internet.
Programming it, well, that is another story.
It would help if you posted the complete error message 
The good news is that the serial-to-usb converter probably survived. If your board does NOT use the CH340 serial-to-usb converter, you can run the loopback test (Loop-Back Test Instructions) to check that.
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