ULN2003 Stepper Motor Control Board + 5V Stepper Motor
http://www.icstation.com/product_info.php?products_id=2136DC-DC Buck Converter Step Down Module 4.75V-24V to 0.92V-15V
http://www.icstation.com/product_info.php?products_id=1858PL2303 USB To RS232 TTL Converter Adapter Module
http://www.icstation.com/product_info.php?products_id=1393
ULN2003 Stepper Motor Control AU$2.87, DC-DC Buck Converter AU$2.23, PL2303 Converter AU$1.38
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