Version 1.0
I took the basic design for the auto-top-off from floatswitches.net and just tried to clean it up a little bit. The round switch is ON/OFF, the square switch is a momentary switch so you can fill at will. I have had two of these running for about 4 months now with no problems. Hope this can help someone out.
Here is a list of parts used to make it.
From Radio Shack
• Mini Relay
• Project Enclosure
• Momentary Switch
• SPST Push On-Push Off Switch
• Screw-Cap Panel-Mount Fuse Holder
• fuses
• wire
• Dual Mini Board with 213 Holes
• Phono (RCA-Type)
• Panel-Mount RCA Phono Jack
• 9-Volt Battery Holder
• Fully Insulated 9V Battery Snap Connector
From Home Depot
• GFCI Duplex Receptacle
• power supply cord
From floatswitches.net
• floatswitches
Water Pump
Water
Container
(I use a 2 gal for the 15 gal nano and a 5 gal bucket for the 55gal tank which gives about 5-6 days on each tank) ATO-1.jpg ATO-2.jpg ATO-3.jpg ATO-4.jpg I think in the next version I will add a third phono plug and float switch. This third switch will be placed in the top-off container in order to keep the pump from running dry (which happen to me luckily the battery died before it killed the pump).
