Sound sensor enclosure (MAX4466 / D1 mini)
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A small box to hold WEMOS D1 mini (ESP) and a MAX466 sound sensor
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Model information
- Source
- Printables
- Category
- Electronics
- License
- Creative Commons — Attribution
Build an ambient sound sensor. This small box fits a microcontroller and the sensor, is powered from USB-C and looks neat on the wall.
My use-case: the sensor measures ambient sound levels in the room, and reports those to HomeAssistant. HA has a threshold rule - if sound reading is extremely high, then (seeing as the sensor is mounted next to building fire alarm) the fire alarm is probably active - send an alert.
Materials needed
- Wemos D1 mini 4.0 USB C
- MAX4466 sound sensor breakout board
- M2 threaded inserts (OD 3…3.5mm depth max 3mm) x 4
- M2 bolts x 4 (4…6mm)
- USB C power
- Double-sided tape for mounting
Build instructions
- Print both models. The enclosure body needs supports on the overhangs.
- Using a soldering iron, melt the 4x brass inserts into mounting holes for the D1 and MAX4466
- Solder 3x wire connections between the sensor and IC
- Assemble into the box
- Mount with tape
Software recommentation
Note on the firmware: if you get intermittent “WiFi auth failed” (WiFi credential is correct, it just won't connect), try increasing the update_interval of the ADC sound sensor reading - 10+ seconds worked for me. Theory: computation after the reading interferes with WiFi somehow.