Difference between revisions of "Darkroom Ratio Calculator"

From Hackstrich
(Changing from 2.5 to 3 digits for ratio component, since we have leftover pins on the drivers anyway.)
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* Total required I/O is:
 
* Total required I/O is:
 
** 20x 7-segment displays
 
** 20x 7-segment displays
** 1x "unable" LED for Round To field
 
 
** 4x rotary encoder inputs
 
** 4x rotary encoder inputs
 
** 1x reset button input (resets to 1:1, total 1000, round to nearest 5, or something like that)
 
** 1x reset button input (resets to 1:1, total 1000, round to nearest 5, or something like that)

Revision as of 01:39, 12 December 2014

Calculating ratios in my head when mixing/diluting chemicals in the darkroom is hard, so I want to build a box to do it for me.

Project Status

  • 2014-12-08: Started putting together initial idea/design.

Overview

  • Input via rotary encoders
  • Output on red 7 segment LED displays
  • Unit will have a light sensor and dim the displays when the lights are turned off so they're safe
  • "Fields" are:
    • Ratio Component A (3 digits) w/ encoder
    • Ratio Component B (3 digits) w/ encoder
    • Value Component A (4 digits)
    • Value Component B (4 digits)
    • Total Value (4 digits) w/ encoder
    • Round To (2 digits) w/ encoder
  • Ratio Components, Total Value, and Round To are settable, Value Components are the output
  • Round To is a way of automatically adjusting the total to find the nearest value that makes ratio components rounded while staying accurate
    • Measuring 67.2ml of liquid is a pain
  • Total required I/O is:
    • 20x 7-segment displays
    • 4x rotary encoder inputs
    • 1x reset button input (resets to 1:1, total 1000, round to nearest 5, or something like that)
    • 1x light sensor input