Please apologize my english. I am working in a project using an original arduino uno, one generic servo (no factory marks) and one HC-SR04 sensor.
I make a circuit like the one here: http://s24.postimg.org/43jra5l9h/mycircuit_bb.png ([url=http://postimg.org/image/lgu1p0gkh/][img]http://s24.postimg.org/lgu1p0gkh/mycircuit_bb.jpg[/img][/url], sorry, upload of image not allowed due reputation)
As you can see from the picture I accidentally connected green into Vin instead of GND. (If the image won't load, that means that my positive is connected to arduino 5V and the ground of the circuit is connected to arduino Vin)
Now my board turn on the lights but I am unable to execute the program already in the microcontroller as aslo I cannot upload a new program to it. (It gives some error message of failed to connect).
I think I burned the microcontroller(mc) by short circuiting 5V and Vin.
That said, I have three questions:
1 - Is there any way to find out if I really burned my board using just a low budget multimeter? And if I did, which parts I need to replace? I have access to some spare ATMEL mc and I think I could replace and reprogram them by using another arduino board. However, I am affraid that I may have burned few other items and just by replacing the mc will not give me back all the funcionallities of a new board.
2 - I have basic knowledge of electronics, could someone explain to a beginner like me which impact did that mistake could/have make in all components of the circuit? (Arduino board, the servo and the sensor)
3 - Even before the accident, the circuit just work well for few minutes. I read tons of pages and tried a lot of suggestions, most of them related with power supply (capacitors to avoid flutuations, One battery just for the servo, one battery just for the sensor...) and none gave me good results. I am wondering what are the alternatives to power up this simply circuit, in particular I am looking for this possibilities: Complete external power supply (by using AC to DC adapters), Complete internal power supply (Using just batteries) and a mix of those two (Using AC to DC and batteries). I have no access to a external DC power supply generator other than batteries.