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Old 12-05-2010, 09:44 AM #1
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Default Arduino PWM for TTL drivers

I want to fade a laser (both red and bluray) using PWM from ATMega8 or 168 with Arduino bootloader. I am looking at the O-like/Aixiz TTL driver, they say it accepts 5V on 0V off at up to 5 kHz. ATMega outputs PWM (basically a square wave like TTL), at 490 Hz. It should work together, am I right? I could also use a DAC and Eudaimonium's analog driver. How good would that be?


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Old 12-06-2010, 10:55 AM #2
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Default Re: Arduino PWM for TTL drivers

It should work.
But remember: You just can't feed the driver directly with the digital pins.
You have to use a transistor as a switch. If you don't use it, you will fry the arduino.
And also don't feed the transistor with the 5V output of the arduino, use a external supply for not frying the regultaor of the arduino.
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Old 12-06-2010, 01:38 PM #3
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Default Re: Arduino PWM for TTL drivers

It's not a real Arduino, just an ATMega8 with the bootloader. The driver has a input for the actual power, and a input for the modulation. As said, the whole thing is going to be on a external 5V regulator. Any NPN will do, right?
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445nm 1W Hotlights with CUSTOM BOOST driver
532nm 50mW DealExtreme SDLaser 301 with key, up to spec when IR-filtered!
532nm 400mW DinoDirect Firedragon III "Certified Power Guaranteed" 500mW peak!

632nm 8mW Tesla 30 year old HeNe made in Czechoslovakia
637nm 400mW WF-501b yellow anodized and CUSTOM BUCK driver
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Old 12-06-2010, 02:33 PM #4
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Default Re: Arduino PWM for TTL drivers

Any BJT will work fine.

But if is a direct 5V TTL input you can conect the arduino directly to the TTL input.
Maybe you should put a resistor, but I'm not sure, that depends on the driver.
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~980mW 445nm in Ehgemus RPL style host, thanks to MR. DAGUIN vid
~25mW 532nm (potmoded) from DX (dead now, switch died and repair failed...)not moded vid
~50mW 532nm "star cap" style found in the bus. Yeah, lol.
~6mW 635nm diode laser pic 1 pic 2
~250mW 650nm extracted from 20x DVD burner. <- dead vid 1 vid 2
~130mW 650nm extracted from 16X DVD burner. <$15 to make! LPF thread

~100mW 780mn extracted from 52x CD burner. <- dead cremation vid

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