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Utility Meter Pulse Optical Counter (Home Assistant Glow)
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All in one enclosure of ESP32 Mini and Photodiode to be affixed to a utility meter to measure usage
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- Printables
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- Electronics
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- Creative Commons — Attribution — Share Alike
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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.
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.
Software
Hardware
- MHEtLive ESP32-Mini-Kit (ESP-WROOM-32) (aka WEMOS D1 mini ESP32)
- PhotoDiode with digital output
- LED straightened to face out the top of the case
- Pin connector trimmed to keep it small
- Only 3 wires soldered:
- GND
- 5V
- GPIO (I used GPIO16)
- M3 bolt, self tapped into the plastic
Printing
- Material: PLA Prusament Galaxy Black
- Print Settings (PrusaSlicer): 0.20mm Quality, 15% infill
- Supports: None
Assembly
- Modify photodiode sensor as above and secure to lid using M3 bolt
- Tilt the ESP32 board and push down to get past the lid catches
- Snap the case shut
- 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.
- Mount the sensor to the utility meter using 3M command strip or similar.