User Manual

209 / 223
ULN2003 Driver Board
Product Description
o Size: 42mmx30mm
o Use ULN2003 driver chip, 500mA
o A. B. C. D LED indicating the four phase stepper motor working condition.
o White jack is the four phase stepper motor standard jack.
o Power pins are separated
o We kept the rest pins of the ULN2003 chip for your further prototyping.
The simplest way of interfacing a unipolar stepper to Arduino is to use a breakout
for ULN2003A transistor array chip. The ULN2003A contains seven darlington
transistor drivers and is somewhat like having seven TIP120 transistors all in one
package. The ULN2003A can pass up to 500 mA per channel and has an internal
voltage drop of about 1V when on. It also contains internal clamp diodes to dissipate
voltage spikes when driving inductive loads.To control the stepper, apply voltage to
each of the coils in a specific sequence.