Figure 1.
Schematic diagram
Figure 2.
Assembly diagram
2
Assembly and start-up
An assembly diagram of the system is provided in
Figure 2. The X2 connector is used to connect the
power supply to the circuit and the motor, X1 is the
motor connector, JP1 allows you to attach an
additional button and an optional LED. The R2, C5...C7
elements filter the power supply to the circuit, while
R6, R9, R10 and C8 allow us to set the overcurrent
cutoff threshold. The R8, R11...14, C9 elements are
used to measure the current consumed by the motor,
the T1 transistor controls the operation of the motor
and the PK1 relay is used to change the polarity, that
is, the direction of rotation of the motor.
PIC12F675P
10k
10
10
1k
1k
10
10k
1k
1k
10
10
10
10
BUZ11
GND
GND
+5V
+5V
V+
100nF
100nF
GND
100nF
GND
100nF
+5V
GND
100nF
GND
+5V
V+
GND
+5V
100nF
100uF
100uF
VDD
VSS
1
8
GP5/CLKIN
2
GP0
7
GP4/CLKOUT
3
GP2
5
GP1
6
GP3
4
US1
PR1
R1
R2
R3
R4
R5
R6
R7
R8
*R9
R10 R11 R12 R13
T1
PK1
2
4
3
9
7
8
PK1
C1
C2
X1-1
X1-2
X1-3
C9
C8
C3
LD1
X2-1
VM
GND
+5V
X2-2
X2-3
C5
C4
C6
1
2
3
4
JP1
1
2
S1
P_ON
P_ON
CURR
CURR
DIR
DIR
SETT
SETT
SW
SW
RST
+
+
Figure 3.
Example of connection to a common 4-6 V power supply
JP1
Optional external
components
5V
Common supply of the controllerand
the engine
MIN
MAX
Infinitely adjustable
tripping current
Control button
