Echo Mist

It's a compact USB humidifier controlled by ESP32. Overall cost less than $10.

Lid can fit mason jars, nutella or mayo with 83mm thread diameter (2mm x 4mm pitch). Arduino sketch included emulates Belkin smart plug for ON and OFF, just modify the WIFI SSID and pass before compiling. note ESP32-C3 don't support 5G so check your router setup.

Once connected have Alexa discover devices and say: "Alexa, echo mist on". latest Echo Dots have humidity sensor to automate this.

Use distilled, deionized or pure non-conductive water to protect the circuit, otherwise apply a thick layer of Petroleum Jelly for water proofing. Enjoy the humid air.

Download latest files individually since the zip archive gets generated only once on this site

Ultrasonic Atomizer
https://www.aliexpress.us/item/3256805847958945.html

ESP32-C3 Super mini
https://www.aliexpress.us/item/3256805979062532.html

Level shifters
https://www.aliexpress.us/item/3256805952727189.html