From 87ae59342d9231fcf2415e83b240a93ced05235a Mon Sep 17 00:00:00 2001 From: Jan Grewe <jan@faked.org> Date: Mon, 6 May 2019 21:32:05 +0200 Subject: [PATCH] configure for 800 TPD add notes about configuration calculation --- OpenWatchWinder.ino | 6 +++--- README.md | 48 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 51 insertions(+), 3 deletions(-) diff --git a/OpenWatchWinder.ino b/OpenWatchWinder.ino index 2e625b7..f45789a 100644 --- a/OpenWatchWinder.ino +++ b/OpenWatchWinder.ino @@ -1,8 +1,8 @@ // 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 diff --git a/README.md b/README.md index c56d30d..dbd2394 100644 --- a/README.md +++ b/README.md @@ -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 -- GitLab