problem to upload with buzzer on Rx

Hello,

When I connect a LED on RX pin it's ok I can upload my soft in my Duemillanove whithout problem. But when I connect a buzzer on RX pin I can't upload my soft, I have this error:

avrdude: stk500_getsync(): not in sync: resp=0xf0 avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

I don't use "serial.begin()" in my soft. I don't understand why it's ok with a LED and I can't upload with a buzzer !? :~

Help me please !!

may be it's electronic trouble. Your buzzer is to much resistive. When you connect it to the rx pin, it drains to much current and the arduino never receive its datas...

May be by using a transistor to drive the buzzer would works better.

Professionals of electronics in this forum would help you in a better way that I can do.

ok, thanks you Grag38 !