Chapter 1: Overview; Introduction To The Chapter; Features; Mod-Io Vs Mod-Io2 - OLIMEX MOD-IO2 User Manual

OLIMEX© 2024

CHAPTER 1: OVERVIEW

1. Introduction to the chapter

Thank you for choosing the MOD-IO2 expansion board from Olimex! This document provides a user's
guide for the Olimex MOD-IO2 board.
The MOD-IO2 board allows expanding your existing hardware with GPIOs, relays, PWMs, analog inputs
and more. The design uses the CH32V003 RISC-V microcontroller. The hardware and software design
are considered open source.
Important! This document applies to MOD-IO2 boards from hardware revision C or newer. If you
are owner of MOD-IO2 boards from hardware revisions A or B, please use the older user's manual,
revision F, available here:
https://www.olimex.com/Products/Modules/IO/MOD-IO2/resources/MOD-IO_manual_F.pdf
Other outdated resources suitable for previous hardware revisions of the board can be found here:
https://www.olimex.com/wiki/MOD-IO2
As an overview, this chapter gives the scope of this document and lists the board's features. The
differences between the members of the MOD-IO2 and MOD-IO boards are mentioned. The document's
organization is then detailed.

1.1 Features

MOD-IO2 has the following features:
 CH32V003 RISC-V microcontroller pre-loaded open-source firmware for easier interfacing
 Board uses I2C, allows I2C address change
 Stackable,
UEXT male and female connectors
 9-pin terminal screw connector for 7 GPIOs, 3.3V and GND
 Firmware supports: 7 x GPIO, 2 x RELAY, 3 x ANALOG IN, 2 x PWM (GPIO, ANALOG IN,
PWM multiplexed)
 2 relay outputs with 15A/250VAC contacts with screw terminals
 RELAY output status LEDs

PWR jack for 12V DC
 Four mounting holes 3.3mm ~ (0.13)"
 UEXT female-female cable included
 FR-4, 1.5mm ~ (0.062)", red soldermask, white silkscreen component print
 Dimensions: (61 x 52)mm ~ (2.40 x 2.05)"

1.2 MOD-IO vs MOD-IO2

MOD-IO2 is a smaller-sized input output extension module compared to MOD-IO both in terms of size
and in terms of functionality, however in a lot of situations MOD-IO2 might provide to be the better
choice. Designs which need optocouplers should consider MOD-IO. Additionally MOD-IO has a better
power supply with the option to be provide voltage in the 8-30VDC range.
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MOD-IO2 user's manual