This a plant moisture sensor that turns red as the soil become dryer and green when watered. It using an ATtiny85 along with a cr2032 battery and a moisure sensor the work. The LED is rgb and looks really cool.
I made this to improve my pcb makign skills and because I actully looks forward to this! I used lots of new items like the battery holder along with a new non usb microcontroller
| Name | Purpose | Qty | Cost (USD) | Distributor |
|---|---|---|---|---|
| ATtiny85 | Main chip | 1 | $3.74 | Aliexpress |
| PCB | Connects all the components | 1 | $5.12 | JLCPCB |
| RGB LED | Shows soil moisture level with color | 1 | $1.74 | Aliexpress |
| Resistor (LED) | Protects LED | 3 | $1.26 | Aliexpress |
| 10k resistor | Reset pin pull-up | 1 | $1.15 | Aliexpress |
| 100nF capacitor | Keeps power stable | 1 | $1.46 | Aliexpress |
| Slide switch | Turns the device on and off | 1 | $1.34 | Aliexpress |
| CR2032 battery | Powers the device | 1 | $2.56 | Aliexpress |
| USBasp | Programs the chip | 1 | $2.51 | Aliexpress |
| Dupont wires (F-M) | Connects USBasp to chip on breadboard | 6 | $1.65 | Aliexpress |
| 3D printed housing | Houses everything | 1 | — | Files (self print) |
tax=$1.5 Total: ~$24.03