I write a programme for control a siren with 4 buttons , with output 13 pin to one channel realy. But problem is this when i power arduino gives one pluls check and siren sound as soon power on...there after programme work with buttons.
I want ti stop self test ater switching on.
(deleted)
ranjan131:
I write a programme for control a siren with 4 buttons , with output 13 pin to one channel realy. But problem is ....
The real problem is that you have not posted your program.
...R
Doesn't the bootloader flash the onboard LED (which is connected to Pin 13) when it starts?
As spycatcher2K has said, you could change the pin that the siren is connected to, or use an external ISP programmer to program the Arduino. This would overwrite the bootloader so the pin wouldn't flash on startup, but you then wouldn't be able to program via USB unless you reuploaded the bootloader.
Thnx...after changing the ouptputbpin .13 to 12... it's working fine....thnx once again.