Hello:
Just FYI:
I’ve received a Seeeduino board from you recently and it arrived with a weird problem: when I plug the power the LED on board (and pin 13 LED as well) starts to blink very rapidly. No way to upload my sketch. After searching the web I found out that the reason might be a test program loaded by the manufacturer, or some other problem with bootloader. Here is the solution which fixed my board, probably it can be helpful for others too.
From Arduino forum ( bit.ly/bkNFTP):
Erthy Dyrssen writes :
I did the same: immediately after pressing the **reset **button I’ve pressed **Upload **in the Arduino IDE, uploading the very first Arduino example with an LED. And it helped! After that it worked OK (so far at least ) and other sketches uploaded just fine.
This might be helpful to other people with problems programming the Arduino.