WiFi Sync Clock

prusaprinters

<h3>Three hand analog clock with automatic time adjustment using NTP via WiFi.</h3><h3>Intelligence of the micro controller now removes the gears from the clock.</h3><ul><li>This clock has no gears to rotate hands although it has only one stepper motor.</li><li>Hooks behind the hands interfere with other hands, and reciprocal rotation of the second hand controls the position of the other hands.</li><li>Mechanical endstop defines the origin of the all hands. It has no origin sensors.</li><li>Unique and fun motion seen every minute.</li></ul><p>note: there are reduction gears in the 28BYJ-48 stepper motor</p><h3>Video</h3><figure class="media"><oembed url="https://youtu.be/rGEI4u4JSQg"></oembed></figure><h3><strong>How to make</strong></h3><h5>You need</h5><ul><li>ESP32 based micro controller with WiFi. I used "MH-ET LIVE MiniKit" type ESP32-WROOM-32 board (around 5USD).</li><li>28BYJ-48 geared stepper motor and its driver circuit (around 3USD)</li><li>M2 and M3 tapping screws</li></ul><figure class="image"><img src="https://media.printables.com/media/prints/264395/rich_content/121bbc9e-e020-47dd-b36f-981229efbd5d/suraito1.jpeg#%7B%22uuid%22%3A%22941984c8-f170-4b60-84fb-912509a7a9d2%22%2C%22w%22%3A1560%2C%22h%22%3A1080%7D"></figure><h5>Print and assembly</h5><ul><li>Print all parts with supplied posture. No support needed.</li><li>Select either "backplate.stl" (for wall clock) or "backplate-with-foot.stl" (for desk clock)</li><li>Remove debris and blobs from the parts well. Especially, all axes of hands should be smooth to avoid unintentional motion of hands.</li><li>Check the friction given by the friction unit (friction1.stl and friction2.stl). If the hour or minute hands move unintentionally, increase the friction by inserting foam rubber as shown above.</li><li>Connect the ESP32 and driver boards as shown above.</li></ul><figure class="image"><img src="https://media.printables.com/media/prints/264395/rich_content/cf37f8e4-a1a0-484e-a8d5-cc72385fae1c/suraito2.jpeg#%7B%22uuid%22%3A%22a6ab1ff3-9a6a-45cb-bd44-bcd3273f4f6c%22%2C%22w%22%3A1920%2C%22h%22%3A1080%7D"></figure><h5>Assemble all parts by stacking each other.</h5><ul><li>Fix the back plate to the front face(dial.stl) by using 2mm tapping screws.</li><li>Fix the stepper motor with 3mm tapping screws. If the length of the screw is too long, please use some spacers.</li><li>Fix the circuitry to the back of front face. Please use short 2mm tapping screws. If the ESP32 comes out from the driver board, use some tie wraps.</li></ul><figure class="image"><img src="https://media.printables.com/media/prints/264395/rich_content/9f9caa51-a564-4dad-b217-016fb874b650/suraito3.jpeg#%7B%22uuid%22%3A%22134eae9d-c7ac-47ec-aacb-0e2af75753fd%22%2C%22w%22%3A1448%2C%22h%22%3A1080%7D"></figure><h3>How to use</h3><figure class="image"><img src="https://media.printables.com/media/prints/264395/rich_content/00baedc7-b8f3-4da8-9337-7f77dd349a22/screen-shot-2022-08-18-at-123546.jpg#%7B%22uuid%22%3A%22972325bb-85d2-4f52-9390-4ac19d5b4e50%22%2C%22w%22%3A2612%2C%22h%22%3A1342%7D"></figure><h3>WiFi setting</h3><p>You can configure your WiFi to the micro controller by two ways : Smartconfing or Hard coding.</p><h3>Smartconfig</h3><figure class="image"><img src="https://media.printables.com/media/prints/264395/rich_content/17c447af-f5b9-4880-ae4f-afd171e23808/esptouch.png#%7B%22uuid%22%3A%2207834dd4-5671-4ff2-869a-472b9b995436%22%2C%22w%22%3A768%2C%22h%22%3A815%7D"></figure><p>1 Set <strong>true</strong> to the flag named WIFI_SMARTCONFIG at line #7 in the source code,</p><pre><code class="language-plaintext">#define WIFI_SMARTCONFIG true</code></pre><p>then compile and flash it to the micro controller.</p><p>2 Install the apps for setting WiFi. The apps are at</p><ul><li>Android: <a href="https://play.google.com/store/apps/details?id=com.khoazero123.iot_esptouch_demo&amp;hl=ja&amp;gl=US">https://play.google.com/store/apps/details?id=com.khoazero123.iot_esptouch_demo&amp;hl=ja≷=US</a></li><li>iOS: <a href="https://apps.apple.com/jp/app/espressif-esptouch/id1071176700">https://apps.apple.com/jp/app/espressif-esptouch/id1071176700</a></li></ul><p>3 Power on the clock and wait for a minute. The status of WiFi connection is indicated by the motion of the second hand.</p><ul><li>Large reciprocal motion : connecting to WiFi using previous setting stored in non-volatile memory.</li><li>Small reciprocal motion : SmartConfig mode. If 30 seconds of WiFi connection trial fails, it automatically moves to the the smartConfig mode (waiting for the configuration from smartphone app.)</li></ul><p>4 Set the password of your WiFi using the app as shown above.</p><p><strong>Please not that your smartphone should be connected to 2.4GHz WiFi.</strong> Configured WiFi settings are stored in non-volatile memory and are kept even when the power is turned off.</p><h3>Hard coding</h3><p>1 Set <strong>false</strong> to the flag named WIFI_SMARTCONFIG at line #7 in the source code,</p><pre><code class="language-plaintext">#define WIFI_SMARTCONFIG false</code></pre><p>2 Then you can set SSID and password of your WiFi in the source code directly at lines #11-12,</p><pre><code class="language-plaintext">#define WIFI_SSID "SSID" // your WiFi's SSID #define WIFI_PASS "PASS" // your WiFi's password</code></pre><p>3 Compile and flash it to the micro controller.</p>