Low Filament Alarm

There's a lot of features compacted into this little alarm: On-Off switch, mechanical limit switch for detection, LED light indicators, piezo alarm, as well as teflon tubing for smooth passing of filament through the mechanism. Here are the needed components:

(1) Micro switch: https://ultimachine.com/content/microswitch-ss-3gl13pt
(1) 6P Slide Switch: http://www.robotshop.com/en/tamiya-mini-power-switch-2pk.html
(1) 12V Piezo alarm: http://www.ebay.com/itm/95DB-Alarm-DC-3-24V-12V-5V-El