problem with buzzer connection

[yee0722]

hi all, i have costructed circuit to detect temperature and switch on buzzer and led when exceed the value. i connect multi sensor to the arduino. The led work well which turn on when exceed value, but the buzzer doesn;t function well. when the first sensor triggered, buzzer 1 was on, buzzer 2 and led 2 also switch on (for 1s and off again and repeatedly). can anyone know what's wrong with this circuit? your help wll be much appreciate. I also want to know whether possible to connect multi sensor to the same arduino? thank you so much.

[Nathan_B.]

Your other VI (in the other discussion) is much closer to being correct.  I posted my comment there.  It is very important that you don't branch the Arduino resource and that you have all your Arduino VIs (for a a single Arduino) inline to prevent race conditions.  This then means that you should only have a single instance of Close.vi per Arduino.