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Topic: Your today in pictures..
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Tom Spielman
Master Film Handler
Posts: 339
From: Minneapolis, MN, USA
Registered: Apr 2016
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posted November 08, 2016 01:21 AM
Combining hobbies:
This contraption might look like an ordinary roaster oven, but in reality it is a computer controlled tank for maintaining the temperature of chemicals used for DIY color film processing.
Truthfully, nothing this complicated is needed for DYI color processing, lots of people just use insulated coolers to keep the water temp close or a plain old sink. But it was an excuse to play with electronics and give my son a little more exposure to programming. There's a temperature sensor and a relay which are used to turn the power to the roaster on and off.
The software isn't done. What we did was really simplistic and tends to keep the water a bit too warm. The heating element doesn't cool off right away and will keep heating the water up even though it is shut off.
There are some "PID" algorithms I could use to refine the software, but I don't know if I will take it that far. We'll see. Anyway, it's been fun even though I haven't actually tried to develop any color film yet.
Oh, and there's also a small pump from an aquarium in there to circulate the water to help keep the temperature more uniform. It's like a miniature jacuzzi. [ November 08, 2016, 10:15 AM: Message edited by: Tom Spielman ]
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