The DRV8825 can support 1.5A per winding. It is not suitable for a 2.5A/winding motor.
Buy a driver that can handle at least 2.5 A/winding, preferably more.
@orangenaval
Is this topic a continuation of previous one:
It seems to me that it would be more correct to continue the discussion in that thread.
Ask the moderator to paste these messages there
I have other options for NEMA17
Brand: 123-3D Step angle: 0.9°
Dimensions: 42 x 42 x 27 mm (LxWxH) Type: SL42S225MA2B
Voltage: 2.8 V Rated current: 1.4 A
Holding torque: 1.33 kg-cm Weight: 0.285 kg
Number of wires: 4 Stepper motor size: Nema 17
Resistance: 2 Ounces Item No.: DMO00040
Shaft diameter: 5 mm
Brand: 123-3D Axle diameter: 5 mm
Wire gauge: 24 Awg Step angle: 0.9°
Dimensions: 42.3 x 42.3 x 34 mm (LxWxH) Type: SL42S234MA107
Voltage: 2.04 V Rated current: 1.2 A
Holding torque: 2.1 kg-cm Shaft length: 24 mm
Number of threads: 4 Ounces Item number: DMO00053
Thread type: M3
Cross post flagged.
No, I've used different drive there with an unknown stepper motor.
So I;ve decided to get a new components, and now im selecting which one to go for.
I have a very tight deadline. excuse me 
From the datasheet:
The DRV8825 is capable of driving up to 2.5 A of current from each output (with proper heat sinking, at 24 V and 25°C)
If you do so, the driver is at its absolute limits, and you need a really big heatsink. And you must ensure that the ambient temperature never rises over 25°C
Never operate a module at its absolute limits for normal operation.
To determine the power supply for a current controlling stepper driver ( like the DRV8825) you must determine the power needed for both coils of the stepper ( rated voltage x rated current x 2). Then add at least 50% for losses, mechanical work and safety margin. Thats the power your PSU must supply. Voltage of the PSU should be at least 3x the rated voltage of the stepper - more is better ( within the specs of the driver)
What about the encoder?
Your two or more topics on the same or similar subject have been merged.
Please do not duplicate your questions as doing so wastes the time and effort of the volunteers trying to help you as they are then answering the same thing in different places.
Please create one topic only for your question and choose the forum category carefully. If you have multiple questions about the same project then please ask your questions in the one topic as the answers to one question provide useful context for the others, and also you won’t have to keep explaining your project repeatedly.
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Could you take a few moments to Learn How To Use The Forum
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Thank you.
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