mikroElektronika STEPPER 2 click User manual

2 3
2. Soldering the headers
3. Plugging the board in
Once you have soldered the headers your
board is ready to be placed into the desired
mikroBUS™socket. Make sure to align the cut
in the lower-right part of the board with the
markings on the silkscreen at the mikroBUS™
socket. If all the pins are aligned
correctly, push the board all the
way into the socket.
Turn the board upward again. Make sure
to align the headers so that they are
perpendicular to the board, then solder the
pins carefully.
Turn the board upside down so that
the bottom side is facing you upwards.
Place shorter pins of the header into the
appropriate soldering pads.
Before using your click board™, make sure
to solder 1x8 male headers to both left and
right side of the board. Two 1x8 male headers
are included with the board in the package. 1
Stepper 2 click carries an A4988
microstepping motor driver along with
screw terminals for connecting an external
motor, as well as for bringing in an external
power supply. The output drive capacity of
the motor is up to 35V and ±2A. The board
communicates with the target MCU through
EN, RST, SL, ST and DIR pins (corresponding
to AN, RST, CS, PWM and INT pins of the
default mikroBUS™ conguration). Stepper
2 click has a 3.3V power supply but is also
compatible with 5V logic.
1. Introduction
0100000085769
click
BOARD™
www.mikroe.com
STEPPER 2 click
Stepper 2 click Manual v100
4. Essential features
The A4988 chip is designed to drive bipolar
stepper motors in full-, half-, quarter-,
eight-, and sixteenth-step modes. No phase
sequence tables are required for operating
the driver – a single pulse through the STEP
input drives the motor one micro-step. A set
of three onboard jumpers (J1-J3) allow you
to switch between the dierent stepping
modes (a micro-stepping resolution truth
table is provided in the data sheet of the
chip. The DIR pin is for determining the
direction of rotation of the motor.

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OUT2B
ENABLE
GND
CP1
CP2
VCP
NC
VREG MS1 MS2 MS3 RESET ROSC SLEEP
VDD
STEP
REF
GND
DIR
NC
OUT1B
A4988
VBB2
SENSE2
OUT2A
NC
OUT1A
SENSE1
VBB1
29
U1
AN
RST
CS
SCK
MOSI
MISO
+3.3V
GND
PWM
INT
RX
TX
SCL
SDA
+5V
GND
MIKROBUS DEVICE CONN.
GNDGND
VCC
GND
GND
C1
220nF
GND
C2
100nF
J1
J2
J3
VCC
VCC
MS3
MS2
MS1
CP1
CP2
VREG
MS1 MS2 MS3
CP1
CP2
VREG
DIR
ST
RST
EN
DIRRST
STEN
VCP
OUT2B
VBB
OUT2A OUT1A
VBB
OUT1B
CN1
VBB
C3
100nF
VCP
CN2 CN3
OUT2B OUT2A OUT1A OUT1B
VCC
PWR
GND
R9
2K2
SEN2 SEN1
GND
R6
0.232
R7
0.232
SEN2
SEN1
GND
SL
SL
R8
5K C4
220nF
GND
8. Code examples
MikroElektronika oers free tech support
(www.mikroe.com/support) until the end of
the product’s lifetime, so if something goes
wrong, we’re ready and willing to help!
Once you have done all the necessary
preparations, it’s time to get your click board™
up and running. We have provided examples
for mikroC™, mikroBasic™ and mikroPascal™
compilers on our Libstock website. Just
download them and you are ready to start.
.com
6. Dimensions
MikroElektronika assumes no responsibility
or liability for any errors or inaccuracies
that may appear in the present document.
Specication and information contained in
the present schematic are subject to change
at any time without notice.
Copyright © 2015 MikroElektronika.
All rights reserved.
mm mils
LENGTH 42.9 1690
WIDTH 25.4 1000
HEIGHT* 3.9 154
5. Schematic
9. Support
* without headers
10. Disclaimer
Stepper 2 click features three pairs of
screw terminals. 2B, 2A, 1A and 1B are for
connecting the stepper motor, VIN and GND
are for bringing an external power supply.
25.4 mm / 1000 mils
42.9 mm / 1690 mils
7. Screw terminals