Is this stepper motor ( https://www.amazon.com/Zyltech-Stepper-Motors-Connector-Printer/dp/B01GNAN2U0/ref=sr_1_9?s=industrial&ie=UTF8&qid=1481498472&sr=1-9&keywords=stepper+motor ) compatible with DRV8825 ?
1.5A is OK with the DRV8825
How fast do you want the motor to go?
What are you trying to do?
I want to lift plastic balls with the stepper. When I connect the stepper directly sometimes the motor stops and won't move anymore for a longer time . So I want now to use DRV8825 because it is easier than and isn't depending on Arduino power. When I bought a shield for DRV8825 ( https://www.amazon.com/XINY-Printer-Stepper-Control-Extension/dp/B01HYTW12Y/ref=pd_sbs_328_7?_encoding=UTF8&psc=1&refRID=NVNG5Z79DTCXXGEB9C2Z ) and mount on it the DRV8825 and start the power supply , the motor doesn't work . So if you can please help me with that.
When I connect the stepper directly sometimes the motor stops and won't move anymore for a longer time .
You were connecting a stepper direct to Arduino pins? Bad news if so, likely fried your pins.
That isn't an Arduino shield. How have you connected it? A stepper won't move till you send step
pulses. It should activate (start holding position).