I'am controlling TRIAC BTA40 with arduino, I have zero-cross detector and circuit to fire the TRIAC gate at the right angle. The software works well, but here is the deal. Sometimes when I plug the 5500W resistance in the 220V wall plug, my arduino reboot and freezes, the LCD stops working.
Anyone have and idea whats is going on? is there good filter I can make to prevent Arduino rebooting?