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1. J2 J3 Step motor connector J2 (5V,D0,D1,D2,D3) J3(5V,D4,D5,D6,D7)
can use Step motor (28BYJ-48 5VDC)
2. J20 5V,GND, D0, D1,D2,D3,D4,D5,D6,D7 OUTPUT
3. U5 ULN2803 8 darlington transistor array
4. JP4 choose 5V input from Mini USB Port J7 or RS-Pi 5V
5. J7 Mini USB 5V input
U5 uln2803 use RS-Pi pin 11,12,13,15,16,18,22,7 as GPIO 0 to GPIO7
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