Utility Meter Pulse Optical Counter (Home Assistant Glow)

prusaprinters

<p>An enclosure for my Home Assistant Glow utility meter sensor. Other designs I've seen had the microcontroller and sensor as separate items, I didn't see the need and wanted a single enclosure.&nbsp;</p><p>I had ESP32 Mini on hand as otherwise, I would have probably built this around a WEMOS D1 Mini ESP8266 which would be slightly smaller.</p><h3><strong>Software</strong></h3><ul><li><a href="https://esphome.io/">ESPHome</a></li><li><a href="https://github.com/klaasnicolaas/home-assistant-glow">Home Assistant Glow</a></li><li><a href="https://www.home-assistant.io/">Home Assistant</a></li></ul><h3><strong>Hardware</strong></h3><ul><li><a href="https://www.aliexpress.com/item/32816065152.html?spm=a2g0s.12269583.0.0.33fb44c89jsbrx">MHEtLive ESP32-Mini-Kit </a>(ESP-WROOM-32) (aka WEMOS D1 mini ESP32)</li><li><a href="https://www.ebay.co.uk/itm/154961766063">PhotoDiode with digital output</a><ul><li>LED straightened to face out the top of the case</li><li>Pin connector trimmed to keep it small</li><li>Only 3 wires soldered:<ul><li>GND</li><li>5V</li><li>GPIO (I used GPIO16)</li></ul></li></ul></li><li>M3 bolt, self tapped into the plastic</li></ul><h3><strong>Printing</strong></h3><ul><li>Material: PLA Prusament Galaxy Black</li><li>Print Settings (PrusaSlicer): 0.20mm Quality, 15% infill</li><li>Supports: None</li></ul><h3><strong>Assembly</strong></h3><ul><li>Modify photodiode sensor as above and secure to lid using M3 bolt</li><li>Tilt the ESP32 board and push down to get past the lid catches</li><li>Snap the case shut</li><li>Adjust the sensor through the hole in the lid using a small cross-head screwdriver so that it only triggers when utility meter LED pulses.</li><li>Mount the sensor to the utility meter using 3M command strip or similar.</li></ul>