My arduino that I just got, when I connect it two red lights go on. I thought it was something normal, that it was suposed to go on, but after I try to upload an example of arduino it didnt work, an error come up, I went to tools, ports, and just two ports(blutooth ports) come up, I have been reading on how to fix it, if burning the bootloader, but I cant because I cant get to my arduino usb port, I have try to change the usb port on the computer but nothing happens. Any one know what to do? I have Mac OS X 10.10.
To help, I will need some more information. Firstly, what board are you using? You mentioned red leds i cant recall any official boards using those, so you might have a clone.
If possible can you also let me know the chip that is used on your particular board for USB-Serial communication? This would be the chip closest to the USB port.
I think is a clone, I discover that after I purchased it, It is a Mega 328P. Two red leds are on, on for "On" and an other one for "L". How can I get the usb serial comunication? There are two infront of the usb port, a grey one CREC12000K(I dont think it is) and another one CH340G with a WCH, and a number 202685509.
Unless you have already installed one, you need a driver for the CH340G chip. Use the search facility in the top right hand corner to discover what other people have done.
Thanks, I can use it already, the only thing is that if it is normal that I need to join GND and 13 with a jump wired the first time that I upload something? And is normal that led "L" is on by default?
No, you should not have to do anything to any pins to make it upload the first time.
You should never directly connect pin (arduino pinout pin) 13 to ground, since that is the pin that drives the LED, and the bootloader uses that pin as an output to blink the led to tell you the bootloader is running - thus you would be connecting and output pin directly to ground, which could damage the board. Only pins that you know will not be set output can be safely connected to ground.
Then, one question, if I have a analog input, can I conect it to ground?
You can safely connect inputs to ground. But only if they have been configured as pinMode(pin,INPUT).
And if it is not configured? for example for a voltemeter.
Why don't you buy a genuine Arduino in the first place and follow the tutorials?
Mucking about with drivers and other non-standard bits and pieces will lead to grief if you are starting out (and later on).
When and only when you have a reasonable amount of experience under your belt can you experiment "off-piste" with cheap boards. I doubt that you would get much support from your seller.
A lot of unpaid work goes into the Arduino project and undermining the project with copy boards puts the genuine board makers out of business
tigger:
Why don't you buy a genuine Arduino in the first place and follow the tutorials?
Mucking about with drivers and other non-standard bits and pieces will lead to grief if you are starting out (and later on).
When and only when you have a reasonable amount of experience under your belt can you experiment "off-piste" with cheap boards. I doubt that you would get much support from your seller.
A lot of unpaid work goes into the Arduino project and undermining the project with copy boards puts the genuine board makers out of business
I am going to buy a geniune, when I bought this one I didnt really think if it was geniune or not, I didnt know there was so much fake arduinos, and I thought it was geniune.
I will buy a geniune arduino asap.
And really, cheap boards dont mean less quality, remember that the price of geniune its because you are supporting the proyect.