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yoshiegg
55mW Advanced Wicked Laser
Joined: 10 Nov 2006
Posts: 68
Location: Ottawa, Ontario - Canada
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 Posted: 1/24/07, 1:50 AM Post subject: Blue laser |
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An e-prom contains a clear window that exposes the semiconductor material to allow for erasing them. Eproms are erased with UV light. I may try programming a pattern to the device and seeing if the laser beam erases the data, maybe I can reset specific portions of the chip. Good for resetting the security bit on secure microcontrollers then read back byte data.
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BoomDog
Wicked Lasers God
Joined: 14 Dec 2005
Posts: 1704
Picture(s): 31
Movie(s): 1
Location: OH, USA
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| Posted: 1/24/07, 10:11 AM Post subject: |
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 I think your laser is overkill 
Nevertheless, nice pictures you got there; I love that laser of yours. I imagine though that the EPROM is probably not going to be erased by it, considering that it comes across that wavelength all the time in ambient light. It would be awfully frustrating programming it and then having it wipe out due to normal light.
Anyway, great pics! |
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Lepotila
Fusion Laser
Joined: 19 Oct 2006
Posts: 450
Picture(s): 231
Movie(s): 79
Location: Finland
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| Posted: 1/24/07, 2:55 PM Post subject: |
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| Then again, ambient light does have UV too. Atleast plenty of UV is coming from the sun. Maybe it`s a question of intensity. |
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BoomDog
Wicked Lasers God
Joined: 14 Dec 2005
Posts: 1704
Picture(s): 31
Movie(s): 1
Location: OH, USA
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| Posted: 1/24/07, 4:14 PM Post subject: |
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| It certainly has to do with intensity, but generally these chips are meant for use indoors, though it can probably get by unless its a particularly sunny day and its out there for a few hours. |
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Shawndoe
Elite Laser
Joined: 09 Dec 2005
Posts: 248
Picture(s): 1
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| Posted: 1/24/07, 6:20 PM Post subject: |
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Define Ambient light, indoors there is almost no UV component in the ambient light. Outside or in places that get sunlight during the day ambient light will have some UV. Direct sunlight, depending on time of year will have plenty of UV to erase that Epprom.
As for the blue laser, it might work. At the wavelength you are using the epprom is probably less sensitive to that wavelength then the UV in the eraser, but it is much more intense.
Try writting FF to all locations then hit it with the laser and read it back. If you don't see a change try writting all 00 to the epprom and try again. See what you can get it to do. Actually epproms were used as imagers before CCDs became so prevelent.
Have a good one.
Shawndoe |
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Vic
Wicked Lasers God
Joined: 30 Oct 2006
Posts: 2006
Picture(s): 66
Movie(s): 3
Location: United States, CA, Los Angeles
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Moffitt
Modified 10mW Greenie
Joined: 06 Aug 2007
Posts: 11
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| Posted: 8/06/07, 10:53 AM Post subject: |
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| That settles it ... I'm buying a blue as soon as I get back in town. |
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Schrecken Licht
Wicked Lasers Master
Joined: 05 Jun 2006
Posts: 717
Location: Maryland USA
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| Posted: 8/06/07, 2:29 PM Post subject: |
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| Moffitt wrote: |
| That settles it ... I'm buying a blue as soon as I get back in town. |
I don't think you'll regret it! 
_________________
Lasers are like potato chips - you can't have just one!
Nexus 95mw, Confirmed 173 mw Pulsar, , 131mw argon-ion laser, Core laser, and Signature Fusion 125mw, 100mw blue - average output 131mw - lab laser, and a 20 WATT (yeah you read that right!) CO2 laser!:
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Bimmer_e28
Modified 10mW Greenie
Joined: 14 Jul 2007
Posts: 12
Location: Casa Grande, AZ
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| Posted: 8/06/07, 5:39 PM Post subject: |
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| that looks sooo coool |
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MarioMaster
Fusion Laser
Joined: 05 Jun 2007
Posts: 307
Picture(s): 44
Movie(s): 7
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| Posted: 8/06/07, 7:02 PM Post subject: |
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| so many old thread revivals.... then again i have some EEPROM chips at home i could try with my executive |
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some.hacker
Modified 10mW Greenie
Joined: 22 Apr 2007
Posts: 11
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| Posted: 8/07/07, 3:57 PM Post subject: |
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| amazing! |
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