IO-Card G3


A custom I/O card to serve as an alarm system.


  • 8 analog inputs for detecting changes in resistance (a.k.a balanced line).
  • 8 digital inputs, 3.3-24V
  • 8 digital outputs, 5/12V, fused.
  • 6 controllable status LED.
  • Optional BME280
  • Wiegand interface
  • On-board buzzer.
  • SD Card (SPI and MMC bus selectable)
  • JTAG debugging (when SD Card is using SPI)
  • LED indicators for all input and outputs.
  • Screw terminals for all interfaces.
  • MCU: ESP32 Wrover Module
  • Powered by 12V DC.


  • Web interface for configuration and status monitoring.
  • MQTT for control and monitoring.