Some project description (in Polish): Used parts: 37,51 EUR drawer slides, two couples 15cm, full extension 6,99 EUR metal stud framing, threaded rod, rope, blocks, screws 5,98 EUR power supply 230 AC-12V DC, 80W/6,67A 6,76 EUR old front wiper motor from Hyundai Getz 2,33 EUR car window switch for manual emergency opening 0,40 EUR limit switch 8,60 EUR Arduino mega (uno is enough) 2,10 EUR two relays 5V 0,68 EUR printed circuit board 1,17 EUR transistors, resistors, pins, wires 11,07 EUR shipping costs 83,57 EUR TOTAL
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