Relay Board with RS232 Communication

Project Description: This board interfaces 23 electromagnetic relays and 8 PNP sensors to any kind of host device (PC or micro-controller) through RS232 port.

Key Components:

  • PIC18F46K22
  • ULN2003
  • SFH6186-5
  • LM2594
  • MAX232


  • 12V or 24VDC Electromagnetic Relays
  • 9V … 24V DC Power Supply (for Logic Unit)
  • 8 Digital PNP Sensor Inputs

Board Top and Bottom Views:

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