Mega Arduino controller build for Reef Setup

Started with everything individually and am now combining individual components into one project.

I got everything to work 100% of the time, except the float switches, they work like 75% of the time. So I'm thinking those are going to be moved to the next phase. (Don't know about grounding, but a lot of people have had issues with snails and other livestock interfering with them, so its become common to put them in a drilled medicine container.)
 
Started with everything individually and am now combining individual components into one project.

I got everything to work 100% of the time, except the float switches, they work like 75% of the time. So I'm thinking those are going to be moved to the next phase. (Don't know about grounding, but a lot of people have had issues with snails and other livestock interfering with them, so its become common to put them in a drilled medicine container.)


Long story short you can't hook up a float switch directly to an Arduino you need to separate it electronically. I was looking into optical switches before deciding it really wasn't worth my time to continue the project.
 
What's the issuer with float switches and arduino? In the middle do a project myself and was planning on using one.
 
I have had floats directly connected to my arduino-based controller for ages now, running ATO flawlessly for 6 years.
I found it necessary to do an external pull-up/down resistor (can't remember which) for when the switch is open, and IIRC the switch is also debounced in software and the ATO pump output has a minimal run-time when the switch is triggered (so it doesn't chatter on and off).
 
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