Arduino automatic water changes - The Planted Tank Forum
 
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post #1 of 11 (permalink) Old 01-21-2015, 04:27 PM Thread Starter
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Arduino automatic water changes

Hey guys. I started off with an idea to build an auto top of which quickly morphed into automating my water changes.. Who doesn't love less work and a little diy automation!


For other diy projects check out my site www.fishtankprojects.com


Last night I finally received my pump and optical sensor and started building the initial prototype

So far so good on the testing.. I have two of the dosing heads identically calibrated. I let it run for 5 min and the water level didn't change in either cylinder.

http://youtu.be/t77dpXbN00g

My initial plan was to use the optical sensor for both safety shutoff and ato however it puts high or low rather than a vale so I will need a second sensor of some sorts for that aspect..

Does anyone know of an ultra small float sensor? The tank this is going on is a fluval edge so I have limited space to work with



Only current issue. I don't think I can use the same sensor for for both ATO and and water change. I have it set to pump for 10 seconds ever hour.... The optical water sensor outputs high or low so if the value is high the pumps don't turn on. If I used an ATO it would pump until the sensor turned


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post #2 of 11 (permalink) Old 01-21-2015, 04:45 PM
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The optical sensor is pretty much a IR distance sensor? but the distance is set in its hardware or firmware.
You can use a regular IR distance sensor that'll output distance value.
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post #3 of 11 (permalink) Old 01-21-2015, 05:05 PM Thread Starter
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Arduino automatic water changes

It's more its touching water or it's not. I'll see if I can find an iR distance sensor to try

My other thought was using a pressure sensor in a little tube


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post #4 of 11 (permalink) Old 01-21-2015, 05:59 PM
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Here's a liquid level sensor tape.

https://www.sparkfun.com/products/10221
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post #5 of 11 (permalink) Old 01-21-2015, 11:13 PM Thread Starter
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To bad they don't have an all black version.. Think it would still work out if it was painted,?


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post #6 of 11 (permalink) Old 01-21-2015, 11:34 PM
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You can buy one directly from the company and it's $10 cheaper
http://www.milonetech.com/Purchase_eTape.html

From reading the data sheet, it senses the pressure inside the sleeve so you can paint it if you want. It's teflon so paint won't stick to it too well and you'd lose the measurement marks.

Putting it on the side of the tank would make it less distracting.


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Last edited by mistergreen; 01-22-2015 at 12:37 PM.
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post #7 of 11 (permalink) Old 01-21-2015, 11:53 PM
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Since it's pressure based, perhaps you could hide it behind a thin sheet of black plastic that would hide it. Wouldn't affect the pressure.


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post #8 of 11 (permalink) Old 01-25-2015, 06:44 AM Thread Starter
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I got my pump box and brains all built and soldered up today


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post #9 of 11 (permalink) Old 01-25-2015, 06:59 AM
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The first few days when you stand over your auto-dosers as they fire, are the absolute best.


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post #10 of 11 (permalink) Old 01-31-2015, 04:52 PM Thread Starter
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Oh it will be sweet. Almost done. Just waiting for a second optical sensor that I ordered





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post #11 of 11 (permalink) Old 07-29-2016, 01:20 PM
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Any updates on this? Looking to do something similar - curious about the sensors you used.


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