# Idan Avioz — Portfolio

> Electronics · IoT · Embedded Systems. Designing, building, and testing hardware from the ground up. Every project here was soldered, debugged, and brought to life by hand.

I am an Electrical Engineering and Physics student drawn to the point where electronics meet the physical world. Every project here was physically built and tested, from soldering components and wiring circuits to tracing faults on the bench. I believe the best way to understand a system is to build it from scratch, fail, and iterate until it works.

## Projects (6, newest first)

### 1. AI Voice Assistant — ESP32-S3 Device with Display & Hebrew UI
- Category: Embedded AI
- Summary: Built a standalone push-to-talk AI voice assistant around an ESP32-S3 with a 2.4" color display: it records speech through an I²S microphone, sends it through a cloud speech-to-text → LLM → text-to-speech pipeline, and answers aloud in Hebrew or English while an animated chat interface shows the conversation in right-to-left Hebrew. My focus was the system architecture, hardware selection, wiring, and stage-by-stage integration and testing; the firmware was written with AI assistance.
- Tech stack: ESP32-S3, Arduino IDE, I²S Digital Audio, INMP441 MEMS Microphone, MAX98357A Class-D Amplifier, ST7789 IPS Display (SPI), EC11 Rotary Encoder, PSRAM, Wi-Fi / HTTPS, OpenAI API, Speech-to-Text, LLM + Web Search, Text-to-Speech, AI-Assisted Development
- Microcontroller: ESP32-S3-DevKitC-1 (N16R8: 16MB Flash, 8MB OPI PSRAM)
- Display: ST7789 2.4" IPS, 320×240, SPI @ 20MHz
- Controls: K0 / BOOT push-to-talk, EC11 knob (volume, 10 steps), knob press = new chat
- Microphone: INMP441 MEMS, I²S, 16kHz
- Amplifier: MAX98357A Class-D I²S, 12dB gain, auto shutdown when idle (GPIO 13)
- Audio Output: 24kHz, 16-bit PCM
- AI Pipeline: gpt-4o-mini-transcribe → gpt-6-luna + web search → gpt-4o-mini-tts
- Languages: Hebrew & English (right-to-left rendering on screen)
- Interface: Chat bubbles, live mic meter, thinking dots, equalizer @ 25fps
- Recording SNR: 30–39 dB
- Response Time: ~10 s from button release to speech
- Firmware: Written with AI assistance
- Video: https://idanavioz.com/voice-assistant-demo-v2.mp4

### 2. 4WD Smart Car — Arduino Multi-Mode Vehicle
- Category: Robotics
- Summary: Assembled, wired, and configured a 4WD Arduino vehicle supporting three control modes: IR remote, autonomous obstacle avoidance, and Bluetooth smartphone control.
- Tech stack: Arduino UNO, Sensor Shield V4.0, L298N H-Bridge, DC Gear Motors, IR Remote Control, Bluetooth (BT05), Ultrasonic Sensor, TM1637 Display, Arduino IDE, Dabble App
- Microcontroller: Arduino UNO + Sensor Shield V4.0
- Motor Driver: L298N Dual H-Bridge
- Motors: 4x DC Gear Motors
- Distance Sensor: HC-SR04 Ultrasonic
- Display: TM1637 4-Digit Digital
- Control Modes: IR Remote / Autonomous / Bluetooth
- Bluetooth: BT05 Module + Dabble App
- Power: 6x AA Batteries (car) + 2x AAA (remote)
- Libraries: IRremote, TM1637, Dabble
- Video: https://youtube.com/shorts/o8OCKY2Ujgg
- Video: https://youtube.com/shorts/cm4n-C2ftyQ

### 3. Smart Bin — Touchless Auto-Opening Trash Can
- Category: Smart Devices
- Summary: Built a touchless smart bin with four RF-switchable operating modes, a servo-driven lid that opens in proportion to hand distance measured by an ultrasonic sensor, and a live distance readout.
- Tech stack: Arduino UNO, Sensor Shield V4.0, HC-SR04 Ultrasonic Sensor, Servo Motor, RF 433MHz Remote, TM1637 Display, NewPing Library, RCSwitch Library, Arduino IDE
- Microcontroller: Arduino UNO + Sensor Shield V4.0
- Distance Sensor: HC-SR04 Ultrasonic (pins A0/A1)
- Actuator: Servo Motor (pin 9)
- Display: TM1637 4-Digit (CLK: 4, DIO: 3)
- Wireless: RF 433MHz Receiver (pin 2)
- Control Modes: AUTO / OPEN / CLOSE / LOCK
- Auto Threshold: 30cm detection range
- Power: 18650 Rechargeable Li-ion Battery
- Libraries: NewPing, Servo, TM1637Display, RCSwitch
- Video: https://idanavioz.com/projects/smart-bin-demo.mp4.mp4

### 4. Simon Game — Soldered PCB Memory Game
- Category: Electronics
- Summary: Hand-soldered a complete Simon memory game PCB shield for the Arduino UNO — LEDs, push buttons, and buzzer — and brought it to life with the course’s game firmware.
- Tech stack: Arduino UNO, PCB Soldering, LEDs, Push Buttons, Passive Buzzer, INPUT_PULLUP, Wokwi PCB Shield, Arduino IDE
- Microcontroller: Arduino UNO
- Interface: Custom Wokwi PCB Shield (hand-soldered)
- Inputs: 4x Push Buttons with internal INPUT_PULLUP
- Outputs: 4x Coloured LEDs (pins 9–12) + Passive Buzzer
- Max Sequence: 100 levels
- Random Seed: Analog noise from floating pin A0
- Debounce: Release-detection loop
- Game Over: All 4 LEDs flash 3x simultaneously
- Firmware: Provided by the course
- Video: https://idanavioz.com/projects/simon-demo.mp4.mp4

### 5. Soldering Iron Stand — Parametric CAD Design & 3D Print
- Category: 3D Design
- Summary: Designed a custom soldering-iron stand entirely from scratch in FreeCAD — a fully parametric solid model with an angled iron socket, an integrated sponge recess, and personalized embossing — then sliced and 3D-printed it into a working workbench tool.
- Tech stack: FreeCAD, Part Design Workbench, Parametric Modeling, Bambu Studio, FDM 3D Printing, PLA
- CAD Software: FreeCAD (Part Design)
- Modeling: Sketch-driven Pad / Pocket / Fillet
- Base Length: 120 mm
- Holder Angle: 60° inclined socket
- Iron Socket: Ø40 mm → Ø36 mm tapered bore
- Sponge Recess: Ø50 mm circular pocket
- Slicing: Bambu Studio
- Printing: FDM (PLA)
- Personalization: “Idan” embossed relief

### 6. Quadcopter Frame — Parametric Multi-Body CAD Design
- Category: 3D Design
- Summary: Designed a complete quadcopter drone frame in FreeCAD as a fully parametric, multi-body assembly — four arms generated from a single master arm by a polar pattern, a top/bottom plate stack on standoffs, and hardware-accurate motor mounts and electronics bay.
- Tech stack: FreeCAD 1.1, Part Design Workbench, Parametric Modeling, Sketch Constraints, Polar (Circular) Pattern, Multi-Body Assembly, Pad / Pocket / Fillet
- CAD Software: FreeCAD 1.1 (Part Design)
- Configuration: Quadcopter X-frame
- Structure: Multi-body (frame + top plate + 4 standoffs)
- Arm Generation: Single master arm × polar pattern (4×)
- Motor Mounts: Ø3.3 mm holes, 8 × 6 mm pattern
- Electronics Bay: Square cut-out + oval wiring slot
- Features: Pad / Pocket / Fillet / PolarPattern
- Modeling: Fully constraint-driven & parametric

## Skills

- Arduino IDE (Programming)
- ESP32 / IoT (Programming)
- Sensor Integration (Electronics)
- DC Motors & Servo Control (Electronics)
- Stepper Motors (Electronics)
- Basic Circuit Design (Electronics)
- LED Systems & Addressable Strips (Electronics)
- Wireless Communication (RF, BT) (Communication)
- Cellular & Smartphone Control (Communication)
- Remote Control Systems (Communication)
- IoT Cloud Connectivity (Communication)
- Robot Design & Assembly (Robotics)
- Motion Systems (Linear & Rotary) (Robotics)
- Smart Device Development (Robotics)
- Real-Time Audio & Sound FX (Creative)
- 3D Modeling & Printing (Fabrication)
- PCB Soldering (Electronics)
- FreeCAD (Parametric CAD) (Fabrication)
- Bambu Studio (Slicing) (Fabrication)
- Multi-Body Assembly & Polar Patterns (Fabrication)
- I²S Digital Audio (Electronics)
- SPI Displays & Embedded GUI (Electronics)

## Contact

- Email: eavioz@gmail.com
- LinkedIn: https://www.linkedin.com/in/idan-avioz-0300703b4/