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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| Line 20: | Line 20: | ||
* Total required I/O is: | * Total required I/O is: | ||
** 20x 7-segment displays | ** 20x 7-segment displays | ||
| − | |||
** 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
