Arduino Uno constantly blinking L led.

I recently received an Arduino Uno R2. I followed the set up guide on the arduino site for windows but I think there may be a problem with the board. The L led blinks constantly when the board is coneected, I was under the impression that it was only supposed to blink three times when the board was initially connected.

I tried loading the blink sketch onto the board but the TX and RX leds do not light and the L led continues to blink. No error messages apear in the software. I tired pressing the reset button, which makes the L led blink three times quickly, then return to blinking about once per second.

Is the board faulty? Or have I missed something?

oli90:
I recently received an Arduino Uno R2. I followed the set up guide on the arduino site for windows but I think there may be a problem with the board. The L led blinks constantly when the board is coneected, I was under the impression that it was only supposed to blink three times when the board was initially connected.

I tried loading the blink sketch onto the board but the TX and RX leds do not light and the L led continues to blink. No error messages apear in the software. I tired pressing the reset button, which makes the L led blink three times quickly, then return to blinking about once per second.

Is the board faulty? Or have I missed something?

It is quite common for a board to ship with the blink sketch already loaded. You need to work on the uploading problem, does it generate any errors? Does the PC even acknowlege the USB device being connected when you plug it in to the PC?

Lefty

Yeah the computer responds to the board. It shows up in device manager, drivers apeared to install ok. In the arduino software a com port appears when the board is connected .

oli90:
Yeah the computer responds to the board. It shows up in device manager, drivers apeared to install ok. In the arduino software a com port appears when the board is connected .

So what messages do you get when you try and upload a new sketch?

Lefty

Done Compiling
Binary sketch size: 1018 bytes (of a 32256 byte maximum)

Does it have anything to the bootloader?

oli90:
Done Compiling ???
Binary sketch size: 1018 bytes (of a 32256 byte maximum)

Are you pressing the verify button instead of the desired upload button on the IDE?

Oh I wish I wasn't. Yeah everythings good now. Embarrasing. Thanks for your help.

Maybe you guys can help me, I am having the same problem except it is an r3 board blinking L led when I compile m code I get the AVR dude: blah blah blah. Help?

Bstanko6:
Maybe you guys can help me, I am having the same problem except it is an r3 board blinking L led when I compile m code I get the AVR dude: blah blah blah. Help?

Well of course, just change the blah blah blah to blah blah blah.

avrdude: stk500_getsync(): not in sync: resp=0x00

Like I said, that blinking light, and this error when compile.

Bstanko6:
avrdude: stk500_getsync(): not in sync: resp=0x00

Like I said, that blinking light, and this error when compile.

I the below on the forum a few days ago under the heading "windows 7 Code 28 and "Unknown Device" on "Getting Started"" - does it help?

I'm not going to going into every detail, just to say that following the "Getting Started on Windows" led me up a blind alley (Windows 7) involving
No ports showing in device manager at stage 4
"Unknown Device" and "Code 28" on device lists
"Browse my computer" could not locate the .INF file
and lots of other stuff. Even tried a different USB lead, that didn't work
Didn't try throwing it out of window, it's p'ing down out there! smiley-mad
(NB the power and "L" lights worked as described)

My start point was #2 "download the Arduino Environment", unzipped the downloaded file and made sure the folders and files were all in place, as per instructions.

The cure - I removed the unzipped IDE and started again, but this time I executed the Windows installer at stage 2, which I had also downloaded.

Result - files all unzipped, installation completed.

Stage 3 resulted in the Windows driver installation succeeding, not failing! Ports now showing in device manager - well, one anyway, the one with the Arduino on it (COM3). Followed instructions to update driver software, and got message "Windows has determined your software driver is up to date".

Tried making changes to the Blink example and uploading them, all worked OK.

So - use the supplied Windows installer program, and ignore stage 4, and all is well. So far smiley

I hope this helps - Dick

Hello,

I just have a similar problem, but pressed the right button :).
I'd like to flash the arduinoASP software, to use it to update the firmware of a USBasp.
The board is recognized by Win ( Win7 x64 ) and the COM is set to port 12.
After compiling the sketch it is uploaded to the uno quite well, but after waiting 10 minutes it
continues to say "uploading" .
Neither the Tx nor the Rx LEDs are flashing.
I tried to upload one of the examples like "p15_hacking_buttons" but it's all the same.
The software say "uploading" but nothing happens.
Flashing other boards ( mini to mega ) works perfectly well, only this with the UNO ( tried it with another out of the box UNO )
I've got that problems.

Greeting from Munich

Uli

Arduino: 1.8.0 (Windows XP), Board: "Arduino Nano, ATmega328"

Build options changed, rebuilding all
Sketch uses 928 bytes (3%) of program storage space. Maximum is 30720 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x60

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

my software is giving this message and my nano's TX led is simuntenousily blinking

what shoud i do
please reply soon!

Arduino: 1.8.0 (Windows XP), Board: "Arduino Nano, ATmega328"

Build options changed, rebuilding all
Sketch uses 928 bytes (3%) of program storage space. Maximum is 30720 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x60
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x60

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

my software is giving this message and my nano's TX led is simuntenousily blinking

what shoud i do
please reply soon!

It happened with me also, i disconnect all hardware (like motors, sensor etc) connected to my R3 board and then i upload the program. Check always the port address first before uploading.