Download LED Light Bots Bipolar Stepper Motor Driver PCB

LED Light Bots
Bipolar Stepper Motor Driver PCB
Assembly Procedure
Required tools:
3/32 hex wrench
Diagonal / flush cutters
Soldering iron / solder
(optional) Acetone & acid brush
Small flat-blade screwdriver
Voltmeter
13 VDC power supply
Kit Contents
(1) 100uF
(1) 10uF
Capacitors
(1) 1uF
Capacitor
(5) 220pF
Capacitors
(6) 0.1uF
Capacitors
(8) P4KE56A
Diodes
(1) 1N4733
Diode
(1) LED
(6) 10K
resistors
(3) 2.7K
resistors
(1) 220
resistor
(1) 680
resistor
(2) 0.5/2W
resistors
(3) 2-Screw
Terminals
(1) 1K
multiturn pot
(2) 1K,
resistors
(1) 51K
resistor
(1) LM317
IC
(1) 10 pin
header
(1) 20 pin
(1) 14 pin
IC Sockets
(1) 3 pin
header
(1)
Heatsink
(1) L298
IC
(1) Motor Driver
PCB
(1) L297
IC
(1) 4-40 X 3/8”
socket head screw
(1)
74HC14N
IC
Assembly Procedure
Approximate assembly time: 40 minutes
5
Check off when step complete
Note: When the following procedure instructs to “install” a component into the printed circuit board (PCB), it
means the component is to be properly inserted into the PCB, the component leads are to be soldered to the
PCB, and then any excess lead lengths removed.
…
1. Install eight P4KE56A diodes at the positions labeled D3, D4, D5, D6, D7, D8, D9, and D10. Be sure
to insert the banded end of the diode into the square PCB hole of its respective location.
Banded end of diodes
go into square PCB
holes.
…
2. Install five 220pF capacitors at the positions labeled C1, C2, C4, C7, and C8.
…
3. Install one 1N4733 diode at the position labeled D1. Be sure to insert the banded end of the diode
into the square PCB hole.
…
4. Install six 0.1uF (104) capacitors at the positions labeled C5, C6, C9, C10, C11, and C13.
Banded end of
diode goes into
square PCB hole.
…
5. Install one 1uF (105) capacitor at the position labeled C3.
…
6. Install the LED at the position labeled D2. Be sure to position the flat edge of the LED over the flat
edge of the LED outline on the PCB.
Flat edge of LED
…
7. Install the 14 pin and 20 pin IC sockets at the positions labeled U1 and U2 respectively. Be sure to
install the sockets such that the notch in the sockets is positioned over the notch in the socket
outlines on the PCB. Verify all socket pins protrude through the PCB holes.
Notch in socket is
located here and
is aligned with
notch in PCB
outline.
…
8. Install six 10K Ohm (BROWN, BLACK, ORANGE, GOLD), 1/4 watt resistors at the positions labeled
R1, R2, R5, R8, R10, R12. Note: The PCB labeling for R1 and R2 is missing so refer to the photo
below for their locations.
…
9. Install three 2.7K Ohm (RED, VIOLET, RED, GOLD), 1/4 watt resistors at the positions labeled R3,
R4, and R9.
R1
R2
…
10. Install one 51K Ohm (GREEN, BROWN, BROWN, RED), 1/4 watt resistor at the position labeled R6.
…
11. Install one 220 Ohm (RED, RED, BLACK, BLACK, BROWN), 1/4 watt resistor at the position labeled
R16.
…
12. Install one 680 Ohm (BLUE, GRAY, BLACK, BLACK, BROWN), 1/4 watt resistor at the position
labeled R15.
…
13. Install two 1K Ohm (BROWN, BLACK, RED, GOLD), 1/4 watt resistors at the positions labeled R7,
R17.
…
14. Install the 3-pin header at the position labeled VREF.
…
15. Install the 10-pin input header at the position show below.
…
16. Interlock the three 2-position screw terminals together and install them at the positions labeled T1,
T2, and T3. Be sure the terminal’s wire openings are facing the edge of the PCB.
Wires enter
terminals from
this direction
10-pin input header
…
17. INFORMATION: Electrolytic capacitors are polarized devices having positive and negative terminals.
These two terminals are differentiated on the device by identifying the negative terminal with a minus
sign ( - ).
Long lead is positive
terminal
Minus sign indicates
negative terminal
…
18. Install the 100uF electrolytic capacitor at the position labeled C14. Be sure to observe proper polarity.
The positive lead of the capacitor is longer than the negative lead, and the positive PCB hole is
labeled with a “+”. Insert the long capacitor lead into the PCB hole labeled “+”.
…
19. Install the 10uF electrolytic capacitor at the position labeled C12. Be sure to observe proper polarity.
The positive lead of the capacitor is longer than the negative lead, and the positive PCB hole is
labeled with a “+”. Insert the long capacitor lead into the PCB hole labeled “+”.
…
20. Install the 1K multi-turn pot at the position labeled R14. Be sure to position the pot screw towards the
VREF pin header.
…
21. Install the two 0.5 Ohm (GREEN, BLACK, SILVER, GOLD), 2W resistors at the positions labeled
R11, R13.
…
22. Install the LM317 voltage regulator at the position labeled U4. Be sure the metal tab of the regulator
is positioned above the double line on the PCB outline. This will orient the black face of the regulator
towards R17.
…
23. Install the L298 IC at the position labeled U3. Again, be sure the metal tab of the IC is positioned
above the double line on the PCB outline. This will orient the black face of the IC towards D3-D10.
…
24. Insert the 74HC14N IC into the 14-pin IC socket. Position the notch in the IC with the notch in the IC
socket. Verify no IC pins get bent under, or outward, during installation.
…
25. Insert the L297 IC into the 20-pin IC socket. Position the notch in the IC with the notch in the IC
socket. Verify no IC pins get bent under, or outward, during installation.
Notch in IC is
aligned with notch
in IC socket.
Metal tab of IC is
over double lines on
PCB layout.
…
26. Clean the flux off of the back of the PCB using an acid brush and acetone.
…
27. Connect the voltmeter to the board at VREF. Make sure the negative voltmeter lead is connected to
board ground, and the positive voltmeter lead is connected to the center pin of VREF.
…
28. Connect a 13 to 15 VDC power supply to the board. Connect the positive power supply lead to the
screw terminal labeled “+”, and the negative power supply lead to the screw terminal immediately
next to the positive terminal.
…
29. Turn the power supply on and adjust R14 for 0.400 Volts.
…
30. Turn the power supply off and remove it and the voltmeter leads from the board.
Voltmeter
connections
Power supply
connections
…
31. Attach the heatsink to the metal tab of U3 using the 4-40 X 3/8” socket head cap screw.
This completes the “Motor Driver Circuit Board” assembly procedure
Motor Driver Assembly Proc.doc