SI-GRID is a signal matrix that you can reprogram at will. It can simultaneously create arbitrary interconnects—any node count, any topology—across 32 pins, for both analog and digital signals. Think of it as an Ethernet switch for any signal type, that works with standards including SPI, I2C, JTAG, and GPIO.

It dynamically creates any connection pattern you want across a 16×16 grid of signal endpoints, enabling arbitrary interconnects among any number of nodes—point-to-point, one-to-many, or many-to-many, on demand. In short, SI-GRID is a shape-shifter for your lab. Bring your ideas: how you configure it is entirely up to you.

Route, Split, Reconfigure

As a signal switching device, SI-GRID is highly versatile and broadly applicable. Whether you’re a hardware engineer who wants to experiment with signal expansion and switching, a chip designer who wants to verify pin-multiplexing behavior across the chip lifecycle, or a sound engineer looking to route and switch audio sources it can be used in so many ways.

It’s a fantastic way to quickly, simply, route and multiplex one or several SPI/I2C/JTAG/GPIO lines or analog signals (like audio) into more channels, with real-time reconfigurability. You can even build a network-like topology across a large set of signals? If you’ve ever wondered, “Is there a switching device for electrical signals—something like an Ethernet switch, but for signals?” then SI-GRID is what you’ve been thinking of.

SI-GRID consists of a main core board, along with a control board and a programming board.The control board is a general-purpose ESP32-S3 development board (based on ESP32-PICO-D4). It includes an on-board buzzer, RGB LED, antenna, and a programming header/interface. Use it standalone, or drop it into other projects as the control module. Thanks to the ESP32-PICO-D4’s integrated RAM, flash, clock, and other components, this board makes an ideal wireless-enabled development platform.

Features & Specifications

• Analog Devices AD75019
• Signal level range: −12 V to +12 V
• Works with digital and analog signals with no shared ground required with external signals
• 16×16 signal nodes with arbitrary topologies and any number of simultaneous interconnects
• Cascade-ready to expand to larger matrices
• 2.54 mm (0.1 in) pitch Euro-style screw terminals

Control & Integration

• Plug into your existing control system directly, or use the optional control board
• CLI over UART for easy scripting and system integration
• Web-based GUI over Wi-Fi: apply changes in real time or stage presets and deploy them immediately

Power

• Single 5 V supply (via USB Type-C or power terminals)
• Robust power design (based on Analog Devices / Linear Technology components):
  - Separate power rails for digital and analog domains
  - Multiple protection mechanisms
• Power (green) LED

Control

• SPI-like host protocol
• 4 yellow status LEDs

Control Board

• ESP32-PICO-D4
• Reset button
• SI-GRID Wi-Fi-based firmware pre-installed
• Supports Expressif and Arduino IDEs

Programmer

• Silicon Labs CP2104 USB bridge
• 1 A 3.3 V LDO regulator (output to target)
• LED indicator (pink)

Open Source

SI-GRID is open source and we hope to release a number of files related to its design. Its board schematics will be made available as a PDF, with board layout Gerber files and manufacturing notes and bill of materials released alongside. Moreover its firmware, either as a precompiled binary or source will be available; similarly its companion software will also be made open source. Finally, we plan on making lots of sample code available to people, so using SI-GRID will be as straightforward as possible.

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