Plant humidity screamer
This project was inspired by a random funny video online of someone showing a device which monitors a plant’s humidity level, and if it got too low it started “screaming” with goofy prerecorded messages. I decided to do my own take of this project, and am in the process of building a similar device. Requirements Rechargeable, via USB-C Capacitive moisture sensor Nice big speaker on the front Motion activated, so it doesn’t scream when nobody is nearby All contained in a well designed 3D-printed case Parts selection Name Value/type Price QTY Link Moisture sensor Capacitive 1.20 EUR 1 AliExpress link PIR motion sensor SR602 1.06 EUR 1 AliExpress link MP3 player module DFPlayer 5.03 EUR 1 DFRobot link MicroSD Card 16 GB (any size will do) 1.64 EUR 1 AliExpress link Arduino pro mini Or nano for built-in USB varies 1 NL supplier 18650 Li-ion battery INR18650-33V 1.89 EUR 1 NL supplier 18650 battery holder Wire mount version 1.50 EUR 1 NL supplier USB-C breakout board Includes CC resistors 1.48 EUR 1 AliExpress link LiPo / Li-ion battery charger TP4056 charging board with protection 2.00 EUR 1 NL supplier Boost converter e.g. SX1308 varies 1 AliExpress link