Multiplexers and I/O expanders let a single controller manage many analogue or digital signals without adding extra pins. By routing a common line to one of several channels, they enable reading multiple sensors, driving several actuators, or switching inputs with just a few control wires. Integrated circuits such as 16‑channel analogue/digital multiplexers or 8‑channel I²C switches resolve address conflicts when several devices share the same bus, allowing seamless expansion of sensor arrays or peripheral modules. GPIO expanders provide configurable digital pins over an I²C interface, turning two wires into a set of additional inputs or outputs. These devices are valued for their reliable switching, low‑pin‑count integration, and compatibility with common microcontroller platforms, making them ideal for compact, scalable robotics and automation projects.
Code: SKU-000037
Texas Instruments CD74HC4067 16-Channel multiplexer. What can you do with it? How about taking an analogue to digital reading from 16 devices with only 1 ADC channel and 4 control pins. That's right 16 for the price of 5! 24-Pin SSOP package. More Details...
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Code: SKU-003723
The SparkFun Multiplexer Breakout provides access to all pins and features of the 74HC4051 an 8-channel analogue multiplexer/demultiplexer. More Details...
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Code: SKU-006511
The SparkFun Qwiic Mux Breakout (TCA9548A) is an 8-channel multiplexer that solves I2C address conflicts, allowing you to easily connect up to eight devices with the same address using the Qwiic system. More Details...
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Code: SKU-005244
The MCP23008 uses two I2C pins which can be shared with other I2C devices, and in exchange gives you eight general purpose pins. More Details...
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Code: SKU-002160
Are you low on I/O? No problem! The SX1509 Breakout is a 16-channel GPIO expander with an I2C interface – that means with just two wires your microcontroller can interface with 16 fully configurable digital input/output pins. But the SX1509 can do so much more than just simple digital pin control. More Details...
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Code: COM-40015
This is a breakout board for the very handy 16-Channel Analogue/Digital Multiplexer/Demultiplexer CD74HC4067. This chip is like a rotary switch - it internally routes the common pin (COM in the schematic SIG on the board) to one of 16 channel pins (CHANxx). More Details...
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Code: SKU-006699
The Qwiic GPIO, based on the TCA9534 I/O Expander IC, adds 8 I/O pins that you can read and write to, just like any other digital pin you want. More Details...
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