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  #781  
Old 19-05-2017, 08:00 PM
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wasyoungonce (Brendan)
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Ok PCB2 cheap canon 50mm lens, dirty sensor poor light bad focus, light leaks...hey it has all the hallmarks!

Sensor & PCB is a good'un.
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  #782  
Old 20-05-2017, 09:17 PM
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wasyoungonce (Brendan)
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Ok Garys PCB1 is done. Again I had left hand noise bars in the dark frames although this time they were hard to the left not across the image. Again removing C38/C46 and inserting a 220uf electro cap fixed the issue.

I'm going to leave this capacitor in as a fix as this has been successful for me. I think the noise is a combination of issues: the ceramic caps are poor at noise ripple removal; the caps are laid in the wrong place; the filter capacitance is possible low. Its normal to use a combination of ceramic caps and electros for power line filtering and I suspect this is why adding the electro works.

Of note is that many many others with different PCB layouts have had similar issues.

I'm making a "camera obsucera" (pin hole camera) to do a daytime light frame. Busy like a kindergarten kid with toilet roll tubes paper glue/mache etc! Anyway I've already done light frames so its really just a play time task!

Oh this PCB draw a little more current than PCB2 but not enough to worry no ICs are getting hotter than normal. Just monitoring it.
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  #783  
Old 21-05-2017, 02:04 PM
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wasyoungonce (Brendan)
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Ok pin hole camera was a bit of a fail. The image is too out of focused! Probably an issue with the actual pin hole size and sensor distance. The sensor is ~ 11cm from the sensor and the pin hole...just a pin hole!

Yet it was fun building it....for awhile!

Also found it difficult to get correct effective shutter speed with Cam86view. Yes I could have used another imaging program...

The Pin hole camera did show a good RGB response and over all it tells me the PCB/Sensor is working like advertised.

Anyway I won't pursue the pinhole much more as I've already run the PCB optically.
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  #784  
Old 22-05-2017, 09:23 AM
flolic (Filip)
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Brendan, you need MUCH smaller pinhole
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  #785  
Old 22-05-2017, 02:02 PM
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wasyoungonce (Brendan)
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Thanks Filip...I was thinking the focus is out because of the hole dia.

I tried a smaller hole....better focus now but image is either too dark or bright. I probably have stray reflections as I used some silver Alloy tape inside to seal it.

I won't pursue this it kinda self defeating. It ran fine with a lens jigged in front of it.

Oh from memory I think I failed Kindergarten ...looks like I haven't improved since! That's our humble abode in the image.
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