Hello,

I have BlackBuck 8M laser diode driver 
(http://www.ebay.com/itm/BlackBuck-8M-8A-Buck-Laser-Driver-NDB7A75-NUBM44-NUMB05-NUBM06-NUBM08-/122257691806/?_ul=RU)
with next spec
modulation input 0-5V or 0-5V TTL/PWM
Frequency - 4kHz
Modulation rise/fall time - 40/60ms

I user arduino as TTL generator everything are ok but when duty cycle 
around 40% - 0% laser power, duty cycle 60% - 100% laser power

Question possible to config on BBB
0-40% duty cycle - 0% laser power 
60-100% duty cycle - 100% laser power

and for example
41% duty cycle - 5% laser power
40,2% duty cycle - 1% laser power
40,5% duty cycle - 2,5% laser power
etc

another solution?

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