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MOD-IO2 is a stackable development board which adds RELAYs and GPIOs to any of our development boards with UEXT. If you work with any of our development boards with a UEXT connector and you need more GPIOs and/or RELAY outputs, you can add these by connecting MOD-IO2 to your development board. This board gives you an easy way to interface up to 2 relays and 7 GPIOs. MOD-IO2 is stackable and addressable, what does this mean? It means that these boards can stack together so you can add as many inputs and outputs as you want! E.g. 2-4-6-8 etc.! MOD-IO2 has a PIC16F1503 microcontroller and the firmware is available for modification.


  • PIC16F1503 microcontroller
  • Pre-loaded open-source firmware for easier interfacing, especially with Linux-enabled boards
  • ICSP 6-pin connector for in-circuit programming with PIC-KIT3 or other compatible programmer/debugger.
  • 9-pin terminal screw connector for 7 GPIOs, 3.3V and GND
  • PWR jack for 12VDC
  • 7 GPIOs which could implement different functionality as PWM, SPI, I2C, ANALOG IN/OUT etc.
  • 2 relay outputs with 15A/250VAC contacts with screw terminals
  • RELAY output status LEDs
  • Four mounting holes - 3.3mm ~ (0.13)"
  • FR-4, 1.5mm ~ (0.062)", soldermask, white silkscreen component print
  • Dimensions 61x52mm ~ (2.4 x 2.05)"



  • I found a very nice example of MOD-IO2 connected to another board in the internet. It doesn't work despite that I use the same setup as the author. What might be different?
  • There are number of firmware revisions that had been released for MOD-IO2. You should ensure the example you have found used the same firmware revision of MOD-IO2 as the one you have on the module at the moment. Each major firmware revision uses a different board address (for firmware revisions 3, 3.1, and 3.02, it is the same - 0x21) AND DIFFERENT PROTOCOL. Each firmware has a README file inside the source archive that is available for download. Refer to that README or the user's manual for more information about the firmware.

Data sheet


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