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Not exactly. SSR are commonly using TRIAC to switch, which all have some "drop" current even when off. Furthermore, this kind of switching units is mostly designed to switch AC current, not DC (meanwhile some of them are capable of handling DC, where the switching part is a MOS-FET).For the "parallel" drive of the motor from pins: also a bad idea.
Hi,Inkjet printer will not work (different kind of toner/paint, different way of printing etc.). Only laser.Etching solutions is usually available at local electric shops (where normal components are available: resistors, leds or even plain PCB boards). Note that it is not available for on-line orders in most countries due to postage restrictions.
I agree... Most "beginner" Arduino projects are simply "forget" the necessity of current limiting resistors. (Meanwhile many sources states that the lack of these are not a real risk at all.) BTW, I suggest to use 220 R (or similar) resistors on each cathode line (pins D2~D8). For the next step, a shift register may help a lot to use less pins and better coding (MAX 7221/7219 for example).
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