trevorhiller
- Jul 1, 2022
- 3
- Joined
- Jul 1, 2022
- Messages
- 3
Hello everyone, I am seeking some assistance with a simple (I think, but not for me personally) electronic DIY project. I have a fish tank that has a device that collects liquid filtered waste from the tank in a collection cup. This runs via a AC 120 volt, ~22 watt pump. I want to be able to install a small float switch at the top of the collection cup to shut the device off when it is full to prevent overflows.
I've purchased a cheap little float switch: TL Reefs Float Switches for Auto Topoff (2-Pack) | eBay
However, these are not designed to have AC voltage through them so I can't simply splice this into the one of the cables on the filter. I'm also told this is risky around the fish tank (water splashing, etc.) So I am looking to connect the float switch inline with a relay that will switch the 120 volt pump off when the switch is activated.
The float switch is reversible, so it can be normally open/normally closed depending on how it is configured. Ideally how this will work in my mind is this: when the float switch is in the down position, the power flows through to the filter and it works normally. When the float switch is in the up (full) position, the float switch closes the circuit and provides low DC voltage to the relay which then opens the AC side of the relay, shutting off the filter.
Sounds simply enough in my head. However, I know basically nothing of relays other than that it is essentially a magnetic switch and need some help choosing one. I was looking on Amazon and they have some 5 pin automotive-style relays that I believe MAY work. They say that max switching rating is 20/30A (which I should be well under). Does it matter if what I am switching is AC vs DC?
I understand that I would need to provide 12 volt power to two pins of this relay to activate the switch. Would something like this work: Amazon.com: Bosch 0332209150 Changeover Mini Relays - 5 Pins, 12 V, 20/30 A : Industrial & Scientific
Any other suggestions/tips?
I've purchased a cheap little float switch: TL Reefs Float Switches for Auto Topoff (2-Pack) | eBay
However, these are not designed to have AC voltage through them so I can't simply splice this into the one of the cables on the filter. I'm also told this is risky around the fish tank (water splashing, etc.) So I am looking to connect the float switch inline with a relay that will switch the 120 volt pump off when the switch is activated.
The float switch is reversible, so it can be normally open/normally closed depending on how it is configured. Ideally how this will work in my mind is this: when the float switch is in the down position, the power flows through to the filter and it works normally. When the float switch is in the up (full) position, the float switch closes the circuit and provides low DC voltage to the relay which then opens the AC side of the relay, shutting off the filter.
Sounds simply enough in my head. However, I know basically nothing of relays other than that it is essentially a magnetic switch and need some help choosing one. I was looking on Amazon and they have some 5 pin automotive-style relays that I believe MAY work. They say that max switching rating is 20/30A (which I should be well under). Does it matter if what I am switching is AC vs DC?
I understand that I would need to provide 12 volt power to two pins of this relay to activate the switch. Would something like this work: Amazon.com: Bosch 0332209150 Changeover Mini Relays - 5 Pins, 12 V, 20/30 A : Industrial & Scientific
Any other suggestions/tips?