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Maybe a propeller spinning in front of the sensor. It'd look cool, too
:)

Cheerful regards, Bob

On Thu, Nov 6, 2014, at 11:21 AM, Robert Dvoracek wrote:
> > From: bobblick@ftml.net
> > To: piclist@mit.edu
> > Subject: Re: [EE] Looking for small , cheap source of full spectrum UV
> > Date: Thu, 6 Nov 2014 10:50:18 -0800>
> > My inexpensive auto-darkening helmet works great for MIG but isn't
> > triggered very well when TIG welding, especially if I am facing bright
> > light, say from the sun coming straight in a window and hitting my
> > helmet. Even avoiding those situations it is sometimes slow darkening.
> > The settings on the welder make a lot of difference too. I've used $300
> > helmets and they seem to work fine, but I don't own one. Yet.
>=20
> Some of the cheap masks will only trigger on a flickering light.  DC TIG
> has way less flicker than almost any other process, so that causes the
> LCD to shut off and blast your eyes.  If you rig up something, maybe a
> hall sensor that flashes an LED at the sensor.  I'm sure you can figure
> something out.                                    =20

--=20
http://www.fastmail.fm - Faster than the air-speed velocity of an
                          unladen european swallow


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