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dejandejanovic

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Which NEMA17 stepper motor IC driver for using with Arduino + GRBL cnc open source?

Hello,
need help from experts. I need to build small CNC for school study purpose, and have minor problems with driver.
Current situation of hardware, and software:
- Arduino Uno
- stepper motor EasyDriver v4
- Nema17 stepper motors
- github grbl open source as software
I have already successful hardware, with grbl software. Process works successful.
What I have found that EasyDriver are very unstable, meaning they are overheating, sometimes one of them is not even working (like disconnected at all). I have also already find some public posts that also other users have same problems.

So, what I would like to replace those drivers. Most would like to build own circuit, but do not have a lot of experience with IC chips which would able to connect with Arduino, and to be compatible with GRBL software. Of course I can buy something for 50-100$, but that would not be a student project anymore, due to high cost budget.
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Davis McCarn
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The Easydriver board uses an IC with a maximum current of 750ma which I suspect is the root cause of most folks "overheating" issues.  It does; however, allow the stepper supply voltage to be as high as 30 volts which might well radically change things as you would have 22.5 watts at 30 volts versus 9 watts at 12 volts.
http://www.allegromicro.com/en/Products/Part_Numbers/3967/3967.pdf

If you are overloading the IC, the key to fixing it is in working backwards from the specs on the stepper.  How many amps at what voltage does it need to work for you?
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dejandejanovic

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Continuously around 1.5A, and between 20-30V.
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Davis McCarn
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Will be compatible with GRBL?
Thanks.