A DIY smart flower pot with automatic watering: Arduino (soil + DHT + servo valve) talks over Bluetooth to a Raspberry Pi, which runs a FastAPI backend and a React dashboard for monitoring and manual watering.

This project was developed for the Embedded Computer Systems course at FESB, University of Split.

Prototype wiring (our “scrap build”)	Wiring / schematic diagram

• Video: assets/Showcase_video.mov

• Course project: developed for the Embedded Computer Systems course at FESB (University of Split).
• Prototype build: the physical construction used available parts and materials; enclosure and wiring can be implemented in many different ways.
• Scalable concept: a typical real-world setup would use multiple Arduino units (one per pot) communicating with one Raspberry Pi for centralized monitoring and control.

┌─────────────────┐     Bluetooth      ┌──────────────────────────────────────┐
│  Arduino Uno    │◄─────────────────►│  Raspberry Pi                         │
│  • DHT11        │   Serial (9600)   │  • Arduino daemon (serial → JSON)     │
│  • Soil sensor  │                   │  • FastAPI (REST)                     │
│  • Servo valve  │                   │  • Web dashboard (React)              │
└─────────────────┘                   └───────────────────────────────────────┘

1. Arduino: flash Arduino/script.ino and wire it (see Arduino/README.md).
2. Raspberry Pi: pair the Bluetooth module (HC-05 or similar) and bind it as /dev/rfcomm0 (see systemd/README.md).
3. Daemon + API: run them on the Pi (or locally) (see api/README.md).
4. Dashboard: in frontend/dashboard run:

npm install
npm run dev

Note: the dashboard currently calls the API at http(s)://<current-host>:8001 (same host, port 8001).

• Simple setup: a 5 V / 2 A power bank is a good baseline (≈ 10 W). Peak draw can approach this range when the servo moves, depending on the servo and peripherals.
• Our prototype power: we used a separate 6 V accumulator for the servo and 2× 9 V batteries in parallel into Arduino Vin as an “electronics challenge” for the course. You don’t need to copy that setup.
• Common ground is mandatory: if the servo or any module uses a separate supply, that supply’s GND must connect to Arduino GND or the system may behave unreliably.
• Arduino regulator limitations: the onboard Vin → 5 V regulation is power-limited (heat + current). If you run from 9 V batteries, expect less usable current headroom than “9 V” might imply.
• Capacitor trick: many random resets / disconnects can be fixed with a capacitor in parallel with Vin and GND (e.g. 100–470 µF), especially when the servo moves.
• Bluetooth stability: the HC-05 needs stable voltage and current. If power dips, it may randomly disconnect (a stable supply + decoupling capacitor typically helps).

See LICENSE.