Project Hub /Basic Analog & Power Electronics/Discrete & Component Electronics/ADG2128 Breakout

Intermediate

ARDUINO

₹1,500 – ₹5,000

3 – 6 Hours

Partial Kit

ADG2128 Breakout

A custom breakout board for Analog Devices' ADG2128 8x12 analog cross-point switch, complete with decoupling capacitors and I2C address selection jumpers.

Originally published on Hackaday.io

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

10pcs - 220 ohm 1/4 W Resistor Set Rs. 39.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

This list includes a generic resistor set as a placeholder — it is not matched to the exact value or part number this circuit needs. The correct one is specified on the original source page linked above; check it before buying.

We don't carry yet: Generic microcontroller (unspecified)
Other Dev Board (Indusboard / Maixduino / misc)
Capacitors
Header Pins / Terminals / Connectors

Browse all components

How It Works

The ADG2128 Breakout project centers around the ADG2128 8x12 analog cross-point switch, which acts as a versatile matrix to route multiple analog or digital signals between various inputs and outputs. Controlled via an I2C interface from a microcontroller like the Arduino Uno, the switch allows any of the 8 inputs to be connected to any of the 12 outputs in software. To ensure reliable and stable operation, the breakout board includes essential supporting elements: decoupling capacitors placed close to the power pins to filter out high-frequency noise and voltage transients, and I2C pull-up resistors to maintain proper logic levels on the serial data (SDA) and serial clock (SCL) lines. Address selection jumpers are also provided to configure the device's I2C bus address, preventing conflicts if multiple boards are chained together. Users interface with the hardware through soldered pin headers, utilizing a custom C++ driver and the Arduino IDE to send configuration commands over the I2C bus. When commands are received, the internal switches close or open designated matrix pathways, allowing complex signal routing without physically rewiring the circuit.

Why Build This

Design and implement automated test equipment (ATE) that requires dynamic, software-controlled signal path switching.

Build modular synthesizer patches or complex audio/video matrix routing systems using an undergraduate-level engineering approach.

Master advanced peripheral control by interfacing a complex multi-channel analog switch IC with an Arduino microcontroller via I2C.

Real-World Application

Signal routing, automated test equipment (ATE), modular synthesizers, and complex audio/video signal matrix switching.

Skills You'll Learn

I2C communication protocol

analog matrix switching

hardware decoupling techniques

C++ driver integration

PCB breakout utilization

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Technology Tags

ANALOG SWITCHES

I2C

PCB DESIGN

BREAKOUT BOARD

CROSS-POINT SWITCH

C++

ARDUINO DRIVER

Frequently Asked Questions

Can the ADG2128 switch digital signals as well as analog signals?

Yes, the ADG2128 can route both analog and digital signals, provided they stay within the voltage supply limits specified for the breakout board.

Why are I2C pull-up resistors necessary on the breakout board?

Pull-up resistors pull the SDA and SCL lines to a stable high voltage state when the bus is idle, which is required for reliable communication between the Arduino and the switch.

How do I control more than one ADG2128 board from a single Arduino?

You can use the onboard address selection jumpers to change the I2C device address for each breakout board, allowing multiple units to share the same two-wire I2C bus.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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