Commit 87ae5934 authored by Jan Grewe's avatar Jan Grewe
Browse files

configure for 800 TPD

add notes about configuration calculation
parent ab87c16d
// Configuration
#define CYCLES 2
#define ROT_R 2
#define ROT_L 2
#define PAUSE_MIN 2
#define ROT_R 5
#define ROT_L 5
#define PAUSE_MIN 35
// Pins
#define LED_PIN 5
......
......@@ -25,6 +25,50 @@ configured amount of minutes (`PAUSE_MIN`), and eventually restart the cycles. T
* When clicking the button while it is waiting for the next cycle, it will start winding again immediately.
* When double-clicking the button in any state, the LED will turn off if it was on, or on (in the appropriate status mode) if it was off.
## Configuration
I have no special knowledge about automatic watches, but i read that these watches require between 650 and 950 turns per day (TPD) to keep going.
To find the right number of rotations, cycles and minutes to pause, we need to do a bit of calculation:
* 1 cycle = 20 turns (2 * 5 turns in each direction)
* 800 TPD / 20 turns per cycle = 40 cycles per day
Alright, so 40 cycles will be required. But how long would it take to get 40 cycles?
* 1 turn = 4.5 seconds
* 20 turns = 90 seconds
* 40 cycles = 3600 seconds (1 hour)
That means 800 TPD would be achieved in 1 hour of non-stop rotation, but that could possibly harm your watch if you leave it on there the whole day. Or so i heard...
So we need to find the appropriate time to pause between cycles, to spread those 800 TPD over the whole 24 hours:
* 1 day = 1440 minutes
* 1440 minutes / 40 cycles = 36 minutes in total, for a cycle including the pause between cycles
* 36 minutes total - 90 seconds cycle = 34.5 minutes pause
Now let's round this up to **35 minutes of pausing** between cycles, as i think a watch that's only "nearly completely wound all the time" is better than a watch that's "nearly broken soon".
To confirm our calculation, let's see how close we got to 800 TPD:
* (35 + 1.5) * 40 cycles = 1460 minutes
* 1440 / 1460 minutes * 800 TPD = 789 TPD (or: 0.9863%)
If your watch requires more or fewer TPD, i would suggest adjusting the pause between cycles first:
* for 650 TPD:
* 650 / 20 turns = 32.5 cycles
* 1440 minutes / 32.5 cycles = 44 minutes total
* 44 - 1.5 = 42.5 -> **43 minutes of pause**
* 1440 / (43 + 1.5) * 32.5 * 650 = **~647 TPD**
* for 950 TPD:
* 950 / 20 turns = 47.5 cycles
* 1440 minutes / 47.5 cycles = ~30 minutes total
* 30 - 1.5 = 28.5 -> **29 minutes of pause**
* 1440 / (29 + 1.5) * 47.5 * 950 = **~944TPD**
Please bear in mind that those are theoretical numbers, and that the actual values will depend on
how long a rotation takes on your build. I take no responsibility for any damage whatsoever! ;-)
## LED Status
* **Solid**: Standby / Manually Stopped
* **Long Blinking** (1s on, 0.2s off): Winding
......@@ -58,6 +102,10 @@ configured amount of minutes (`PAUSE_MIN`), and eventually restart the cycles. T
* Arduino -> Button + LED
* Terminal Block -> Arduino & Driver board (split strands into 2x 5V/GND)
## ToDo
* Allow stopping immediately, not only after current rotations are done
* Convert to an ESP8266 to make it easily controlable and configurable via a web-interface
## Credits
* Philipp Klimek for his [Gyrocope Watch Winder](https://www.thingiverse.com/thing:3520031)
* [Peter D.](https://www.thingiverse.com/Dilbert0815/about) for the [initial version](https://www.thingiverse.com/thing:2763503/comments/#comment-2067423) of the code
\ No newline at end of file
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment