external power

Forum 2005-2010 (read only) Hardware Troubleshooting
1

hy all;
i know that there are lots of information about this tip; but i could not find the answer for me!
using the usb power i have no problem.
but i have this problem with external power;

when i put the external power the program do not run, but i have power in the board;
the power led is on and the led at pin 13 blink at start but no longer with blinking program.

i´m using;

arduino NG USB with atmega 168.
9v batery center positive.
pin in 2-3 position.

i have 8 boards with the same problem.
any idea or sugestion?
what about using a 5v batery by the usb conector?

thanks!

2

Straight from the troubleshooting guide on the homepage.

Why doesn't my sketch start when I'm powering the board with an external power supply?

Because the RX pin is unconnected, the bootloader on the board may be seeing garbage data coming in, meaning that it never times out and starts your sketch. Try tying the RX pin to ground with a 10K resistor (or connecting it to the TX pin).

3

now its working!
thank you for you kick reply
;D