Home automation: Mini-I/O



As a very needed addition to my home automation project, the Mini-I/O features physical inputs and outputs for those applications where wireless control is insufficiently reliable or unsuitable.


  • Two relay outputs (10A/250V) and two open-collector outputs (800mA)
  • Seven digital inputs and one analog input
  • An additional analog input is internally connected to the voltage input
  • 433.92 MHz ASK-receiver for internal decoding of ESIC wireless temperature sensors and more
  • RS-232 connection


The first PCB prototype was milled at my university (NTNU). Many thanks to Terje Mathiesen at IET for helping me out with this!

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Video-clip of the CNC-router going through the drill-layer.

I'm still missing a few components which are already ordered, but this was what I had at home.


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Design: Jon Petter Skagmo