Quote:
Originally Posted by peter_4059
Looks very nice Steve - what size pot/combination of resistors did you end up using to replace the 20 turn trim pot?
Have you noticed the same thing I did with the histogram being shifted right? Have you needed to reduce the offset?
Also how is the dew control going?
Regards,
Peter
|
I simply de-soldered the pot and araldited it to the front panel.
There is a clearance hole just big enough for the screwdriver to
sit and find it's way into the slot of the pot in the red-light of the dome.
I figured that I'd probably only adjust for a certain setpoint once
per night depending on what ambient was and what the dew point
was expected to be. A visual check of the offset voltage therefore
was needed too I reckon.
As I said, a direct temp readout in LED for would be achievable with
a comparator and some more thought but for now it will do.
(Edit: Pete: if I work out what adjustments/voltage divider/op amp
setup adds a direct temp (200mv scale DMM) readout I will let you
know btw)
As for the histogram shift, yes , see post #41...I did see it.
Posts 44, 45 and 47 have all been different results/setpoints and
ambients, and it seems (at least for my capture method) that
LOTS
of frames and
LOTS of darks, and the setpoint only varying by 2°C
max, I get a smooth result. Seeing obviously helps too...see post #47
Also, as I have just posted...10°C seems to be a sweet spot for
the DSI with ambient above 25-ish.
And no problem with dew on the night of the #47 post....10C/ DP 4C
Steve