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how to ttl board with grbl

Posted by Fbmfbm 
how to ttl board with grbl
February 15, 2018 05:14PM
i all !
i have this board [www.banggood.com] for driving my 2500mw laser diode, but i can't get good ttl output from it.
I'm send signal fro arduino to the ttl + node (and if i test the arduino send 0 to 5 volt ok to this) but with 12v on this board in input, the outpu can only varry from 10.3v to 10.7v (0v in from arduino give : 10.3v and 5v give 10.7).
Can't understand why. i waiting that output voltage varry from 0 to almost 10/12v.....

Any one cane help me to resolve this or know this type of board ?

Thank's
VDX
Re: how to ttl board with grbl
February 15, 2018 05:54PM
... ask the seller or designer ...


Viktor
Re: how to ttl board with grbl
February 16, 2018 02:11AM
I also used to use this board and from what I can remember, there is a bug on it regarding polarity. The print on the PCB is wrong at the fan output or some other header. Better check twice and don't trust the printed polarity marks.
Re: how to ttl board with grbl
February 17, 2018 07:48AM
Thank's o_lampe. I'll check that.
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