(1) Float Switch 1/5
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=77158&p=1384933&hilit=float+sensor+tlfong01#p1388235

(2) Float Switch 2/5
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=77158&p=1384933&hilit=float+sensor+tlfong01#p1388246

(3) Float Switch 3/5
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=77158&p=1384933&hilit=float+sensor+tlfong01#p1384933

(3) Float Switch 4/5
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=77158&p=1382734&hilit=float+switch+tlfong01#p1382734

(5) Float Switch 5/5
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=77158&p=1382734&hilit=float+switch+tlfong01#p1383764