Add general purpose input/output lines to your projects. This circuit is a 12 pin digital GPIO interface which connects to an USB host port.

• 12-bit general purpose input/output (GPIO) board with a micro USB connector
• powered through the USB connector
• drivers and control utility for Raspberry Pi, Linux, Windows and OpenWrt
• independent control of each I/O pin state and direction
• comes with the source code for the driver and the control utility
• multiple boards can be connected to the same host, only limited by the number of ports available
• each board can be addressed by its unique serial number, regardless of which port it was plugged to
• breadboard compatible 2.54mm pitch pads for adding standard male/female headers
• LED power indicator

Board connectors:

• micro USB female connector
• 2 rows of 7-pin 2.54mm pitch pads on PCB

Specifications:

• PCB size: 24 x 16 mm (0.95 x 0.63 inch)
• I/O pin voltage: 5V TTL
• output drive: max 20 mA sink or source (+/-) current per I/O pin
• LOW input levels: 0.8V max on B ports, 1V max on C ports
• HIGH input levels: 2V min on B ports, 4V min on C ports
• input clamping protection diode current: +/-20 mA max per I/O pin
• maximum current for all I/O pins: 90 mA source or sink (+/-)
• maximum current from "+5V" pin(#1) plus all I/O pins: 100mA

Setup and use

Connect the GPIO board using a micro USB cable to the the host. The GPIO board can be controlled from a Windows/Linux computer, Raspberry Pi board or OpenWrt router. When connected for the first time, windows requires installing a driver.

Examples of use:

controlio setdir 0xffff # set all I/O pins as input

controlio -ob getport # Read the digital I/O port states

Example command output is (input states prefixed by 0b): 0b1111000011111111

controlio setdir 0 # set all I/O pins as output

controlio setport 0 # set all output I/O pins LOW

controlio setport 0b1100 # set the RC2 and RC3 I/O pins HIGH, other output pins LOW (works only on output pins)

controlio setbit 0b1000000000000000 # set the RB7 output pin HIGH, don't change other output pins (works only if RB7 is an output pin)

controlio clearbit 0b1000000000001 # set the RB4 and the RC0 output pins LOW, don't change other output pins (works only if RB4 and RC0 are output pins)

Please read the the full documentation.

Download drivers and utilities for the USB relay board. The package contains:

• firmware HEX file for the on-board microcontroller
• the Linux controlio utility executable
• the OpenWrt packages for the controlio utility
• Raspberry Pi binaries for the controlio utility
• the drivers for using the GPIO device under Windows
• the Windows controlio.exe utility
• firmware source code for the on-board microcontroller
• the source code for building the OpenWrt package
• the source code for building the controlio utility for Linux and other POSIX compatible systems
• example code for accessing the GPIO device from python