This repository contains the Altium Designer files for a custom-designed IoT security node. The board is designed to monitor motion using a PIR sensor and communicate alerts via Wi-Fi, powered directly from AC mains.
This project was developed to master Altium Designer workflows, specifically focusing on mixed-signal integration (High Voltage AC + Low Voltage Logic). It combines an STM32 microcontroller for real-time sensor management and an ESP32 for wireless connectivity.
- Dual-Core Architecture: STM32F103 (Main Logic) + ESP32 (Wi-Fi/Bluetooth).
- Onboard Power Supply: Integrates an AC-DC converter (Bridge + Transformer) to step down 220V to 12V, followed by DC-DC buck converters for 5V and 3.3V logic levels.
- Modular Sensing: Features a separate break-out board for the PIR sensor and temperature monitoring to allow flexible placement.
- Actuator Control: Includes onboard relays for triggering external alarms or lights.
DANGER: This circuit is designed to handle 110V/220V AC Mains voltage.
- The high-voltage section is present on the PCB.
- Proper isolation gaps and creepage distances were considered for educational practice but should be verified against standards before actual use.
- Do not touch the board while powered.
| Component | Function |
|---|---|
| MCU | STM32F103C8T6 (ARM Cortex-M3) |
| Connectivity | ESP32-WROOM-32 Module |
| Power Input | 220V AC (Transformer coupled) |
| Sensor | NCS36000 (PIR Controller) + Analog Temp Sensor |
| Relays | 2x 12V Relays for external load control |
| RTC | M41T00 (I2C Real Time Clock) |
The system flow is designed as follows:
AC Mains -> Power Regulation -> STM32 <-> Sensors & ESP32
This project was designed and developed as part of the "PCB Tasarım - Bir Elektronik Kartın Yaşam Döngüsü" course created by Mustafa Berk Aydoğan.
Special thanks to the instructor for the comprehensive guidance on Altium Designer workflows, component selection, and production processes.
This PCB design is an educational project created strictly for learning purposes.
- It has not been tested for electromagnetic compatibility (EMC), thermal stability, or long-term reliability in a real-world environment.
- It is not intended for commercial use or mass production.
- Users should exercise caution and verify the design before any attempt at manufacturing.
This project is open-source and available under the MIT License.