3NPO
pcb k ѤWU 
k3  V}
D1  1n4001 qb2
k4.1 q 
gnd  q a
12V 12v  7805(ϥ)
c1  10uf resetqѹqe ʪ UOt (accord nU pcbХܤU) 
R1  8.2k  89c2051 reset q
C4  78L05 10u qѹqe(ϥ)
U4 78L05 12v5v (ϥ)
k1  89c2051 reset switch « (reset)
c2 c3 33p Xtalqe
X1 12M xtal 
U1  89C2051  8051Lq
R7  ƪA 7pin  1K
u2 uln2003a Fdriver 0.5AO 
d3 R LED (f  _)
d2 G LED (` A) 
k6  Ft
k5  F[t speed up
k7  FȰ stop
k2  Revse Ffत_
p2  }y ѤWӤU ->->->->
r4  ƪB 3.3K
u3  uln2003 (ϥ)
r8 r9 (ϥ)
q1 q2  CS9012 (ϥ)
P3  Fsu ѤWӤUO   (5v)   (5v)  
FO OKI khp42h 2501 step motor  1.8/5V /0.4A

kp pcb
}y  ѤWӤU ->->->->
k2.1 Revse Ffत_   ª
k7.1  FȰ stop      ī
k5.1  F[t speed up  ĸG
k6.1  Ft speed dn  İ

push_button } O 4 pinu 2 I (ݶ} O۳s iιqˬd) 