PoliLock - ESP32 Access Control System

Embedded system project using ESP32, PIR, Hall sensor, RFID (MFRC522), and Servo motor with Blynk integration. This project was developed in 2025 as part of the Embedded Systems Laboratory course in the Computer Engineering program at the Polytechnic School, University of São Paulo (Poli-USP).

Overview

This firmware implements an access control system:

• Sensors: PIR (motion), Hall sensor (magnetic presence), RFID MFRC522 (card UID)
• Actuator: Servo motor (PWM angle control)
• Connectivity: Wi-Fi + Blynk (Virtual Pins over MQTT)
• Architecture: Hardware drivers → Services → Application (FSM) → User interface

System Architecture

Software Architecture

Hardware

Blynk (Virtual Pins)

• V0: Slider → Servo angle (0–180°)
• V1: Value/LED → PIR state (0/1)
• V2: Value/LED → Hall state (0/1)
• V3: Label/Terminal → Telemetry (RSSI, heap, uptime, angle)
• V4: Label → Last RFID UID
• V5: Switch → Manual/Auto mode

Getting started

1. Clone this repo and open in VS Code + PlatformIO.
2. Copy include/secrets.h.template → include/secrets.h and fill in:
   • Wi-Fi SSID and password
   • Blynk Auth Token
3. Adjust pin definitions in include/config.h.
4. Build & upload:

   pio run
   pio run -t upload
   pio device monitor -b 115200