Summary

A simple design to drop into a guitar case to add some humidity to an acoustic instrument. Designed around some 50x70mm PC prototyping boards I happened to have. I might model a grill part to replace the PC board (TBD).

Moisten the cotton pads with some distilled water and place into the guitar case.

I placed a couple Bluetooth humidity monitors in the case to give a humidity reading to a phone app. https://www.adafruit.com/product/4881. I live in Arizona where it rarely gets above 25-30% RH so adding some moisture is critical.

• Cotton cosmetic/makeup removal pads - https://www.amazon.com/Cliganic-Premium-Remover-Hypoallergenic-Lint-Free/dp/B07WMXJG1C/ref=sr_1_3_sspa
• PC board - https://www.amazon.com/Fielect-Electronic-Protoboard-Prototyping-Printed/dp/B081Q54C9N/ref=sr_1_5