SOLDERED DEBO IO EXPANDER - Developer boards - I/O expansion board, MCP23017

The GPIO Expander MCP23017 is an efficient solution to the problem of the limited number of input/output (IO) pins on microcontrollers. By utilizing I2C communication, this expander allows the addition of 16 additional fully configurable pins that can be connected to any microcontroller with just two wires.

• expands microcontrollers by 16 additional IO pins via I2C communication
• enables the connection of up to eight of these breakout boards to a microcontroller
• configurable I2C address via jumpers on the board
• all pins have pull-out resistors that can be switched on and off
• ideal for projects that require a high number of IO pins

By using the MCP23017, the number of available IO pins of a microcontroller can be increased considerably without significantly increasing the complexity of the overall system. The ability to change the I2C address using jumpers allows several such expanders to be operated in parallel, enabling a total expansion of up to 128 additional pins. The pull-out resistors on the board provide additional flexibility for signal integrity and customization to specific project requirements.

Technical data

• Dimensions: 38 mm x 22 mm
• Normal current consumption: 1 mA
• current consumption at standstill: 1 µA
• Logic voltage: 5 V
• Operating voltage: 1.8 ... 5,5 V
• Communication: I2C (address: 0x27)
• Connections: easyC x2
• easyC/Qwiic compatibility
• Holes for mounting: 2

The GPIO Expander MCP23017 is a cost-effective and easy-to-implement solution for significantly expanding the IO capacity of microcontrollers. Its configurability and the possibility of using several expanders in parallel make it an indispensable tool for complex or pin-intensive projects.

easyC
easyC is a robust connection system that optimizes the connection of microcontrollers, sensors and actuators using JST-SH compatible connectors (JST 4-pin). It offers solderless connections, serial connections of multiple devices (daisy-chaining), error-free design, parallel connection, universal compatibility and intermediate compatibility with Qwiic (Sparkfun connection system), simplifying prototype development. Further information on easyC can be found under ''Data sheets''.

External links
https://github.com/SolderedElectronics/Soldered-MCP23017-Port-Expander-Arduino-Library
https://github.com/SolderedElectronics/IO-expander-MCP23017-breakout-hardware-design ...