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I'm interested in using computers to control the environment for growing plants etc. The problem is that most systems don't actually make life easier, unless you are growing on a massive scale. For hobbyists the extra work usually isn't worth it. You end up replacing one boring chore with...

An electric fan is an inductive load. The relay will be subjected to a high voltage spike when switching off. If the relay isn't designed for handling an inductive load, it will degrade quickly and need replacing. In the summer, the controller will switch the fan on and off repeatedly...

Eheim professionals have a detachable adapter. On the 2224 you get two taps on the adapter (good for doing a water change). In the Eheim II-III range, you get one tap controlling both tubes. The 2224 uses 12mm internal diameter hose. I have a 2224 on a 60 cm tank. It's a little under-powered for...

I bought mine here, a 300mm mercury-filled version, only 1.29 each. I gave up on digital thermometers after finding up to +/- 10C variance between makes. Plus a glass thermometer is cleaner aesthetically, the less cables the better. Explore the link, there's a few different types.