gomibakou

It took some time to find the link again, but I think this is the best explanation about masking and ghosting I found, simple and simple:http://www.dribin.org/dave/keyboard/one_html/Anyway it's also possible to reduce or even eliminate some of these effects using software, but it's not trivial.

What about the "ghosting" and "masking"? these are usual problems to count when using matrix keypads. Some diodes (check any good source about ghosting or masking) could help.

It must be the most complete step-by-step project about supplies I ever saw, and with caculations as well, without going into deep mathematics/physics. This is not very usual, normally you get the schematic and final values, but not intermediate steps. Nice job.

I don't use this kind of systems, but what if you simply boil the water. It won't prevent all, but won't hurt and you'll get some benefits... as killing most of the bacterias, spores, etc. surely not all but mostly all. Then you can add anykind of aditives to it.

Do not forget to specify that there are two types of LDR: positive and negative. One decreases resistence with light, the other increases resistence with light (perhaps it is the opposite).

Simple and clean, good for beginers :).You should explain the differences between pre and post-increment operators "++a" or "a++" as elements in an expresion.

Simple and clean, good for beginers :).You should explain the differences between pre and post-increment operators "++a" or "a++" as elements in an expresion.I think the rest of operators should be mentioned even when the instructable is intended for beginers. Operators like << >> , [ ] -> . (cast), etc.

Looks nice. This would be a nice improvement were I used to live, with high temperatures on average... Which is the price of all your system, roughly ?

Today I increase my "dangerousity" x100 :D Simple, nice, clear instructable :D My friends will hate you.

Next time ;) you can use specific software like "Polyboard" (for design) and "Cutmaster" (for cuttings).