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 |