Introduction: Aquarium Water Auto Refill

Hello guys, I want to explain my Aquarium Water Auto Refill system.

Take a look the video : https://www.youtube.com/watch?v=yNjUQKhIWAg

There are similar projects i saw but I did it much more complicated and developed. You will recognize how it works after you examine the schema and video added.

Material List

  • 2 x Float switch - I bought them from Ebay about 2 dollars.
  • 1x 12V 1A DC Power Supply
  • 1x Sump Pump
  • 1x12v Relay ( In order to control 220V cause we don't want to give our float switches 220V directly it is dangerous.)
  • 1x Check Valve (If your pump is lower than your tank, you should use it to protect water returning to backet again)
  • 1xLED

Why should relay be used ?

Float switches cannot be given 220 V AC directly It can deal with max 30 V (for security) and it is also dangerous cause our switches staying in the water so we are using 12V on switches and theycontrol the pump. It makes our system more secure. The switches works likeANDgate. In order to pump water, both of switches must be closed(on transmission). If one of them is open, It wont pump. When 12 Volt goes relay(2 of switches are closed) relay will provide 220V transmission. You can also think relay as a switch.

Note : You should connect float switch itself which is in the bucket as reverse.(see schema) Cause while sensor in the tank should work when water is lower, the sensor in the bucket should not work if water is lower.(to protect motor waterlessness).

Comments

author
DIY Hacks and How Tos (author)2015-07-19

Nice aquarium setup

author
Ian74 (author)2015-07-20

on your wiring diagram it looks like you ran the live straight from the source to the pump and used the relay to switch the neutral, can I ask if this is the case and if so why did you choose to do this as it is normal practice to switch live wires.

author
tiunkabouter (author)Ian742015-07-27

since it is AC and not DC it doesn't really matter that much which side you switch since both wires provide 220~230 VAC

it is just a matter of choice I guess, as long a you wire everything in your setup the same there shouldn't be any confusion.

author
Ian74 (author)tiunkabouter2015-07-27

Actually its a matter of doing things properly, switches / circuit breakers and relays should always be wired so that the Live is always broken not the Neutral. Both wires don't provide 240v AC try measuring it to earth, L-E will give you 240v and N-E will give you 0v as they are they are always at the same potential. I'm just trying to give a bit of advice to do things safely.

author
sarcoptes (author)Ian742015-08-04

I agree with you. Normally, live is switched not neutral for safe. You are right indeed. I just did not care about it cause you cant touch female outlet inside. If it is a lamp holder, we must break live. Cause we may touch live when we are changing our lamp. However, here lamp holder is a female outlet. That's why it wont be a problem it is still safe.

author
sarcoptes (author)Ian742015-07-21

I think you are asking why used relay instead of removing it and connecting the wires directly switch and pump ? If so, float switches cannot be given 220 V AC directly It can deal with max 30 V (for security) and it is also dangerous cause our switches staying in the water so we are using 12V into switches and switches control the pump. It is safe. The switches works like AND gate. In order to pump water, both of switches must be closed(on transmission). If one of them is open, It wont work. When 12 Volt goes relay(2 of switches are closed) relay will provide 220V transmission. You can also think relay as a switch. Please ask if you still have questions.

author
Ian74 (author)sarcoptes2015-07-27

No I totally understand and agree with the reason why you used a relay switched by 12v DC to control the 240v pump I would have done the same. I was asking why you have switched the Neutral with the relay and not the Live as all simgle pole switching devices and fuses etc should be in the Live line.

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