VoCore is open hardware and runs Linux(OpenWrt). It has 128MB DDR, WIFI, USB, UART, SDXC, I2C, SPI, 20+ GPIOs but only one inch square(25.8mm). It will help you to make a smart house, study embedded system or even make the tiniest router in the world.
You will not only get the VoCore but also its hardware design including schematic, circuit board, bill of materials and source code of all applications. You are able to control EVERY BIT of your VoCore.
We invite you join us, help our community improve this open source hardware and use your creative skills to make a more wonderful Internet of Things!


Tiny Size: One square inch, easy to embed to devices.
OpenWrt: Easy to code; super stable, three years no reboot.
Low Cost: low cost, less than 1watt, unmatched performance.
Interfaces: Hardware support USB, Ethernet, SD, I2C, SPI etc.
OpenSource: Both software and hardware, totally FREE
Long Life: Keep production over 10 years, fast email support.
Siemens discontinued general public download of older DIGSI 4 versions after 2021. As of 2026, new license purchases for DIGSI 4 are no longer available – only existing license holders may download via their contract portal.
The text for primarily refers to the download version of the Siemens engineering software used for configuring and operating SIPROTEC protection devices. siemens digsi 4.91 download
are currently recommended for active support and advanced compatibility, Siemens discontinued general public download of older DIGSI
Facilitates detailed fault analysis by visualizing disturbance records as curves, vector diagrams, and bar charts to reduce system downtime. siemens digsi 4.91 download
: Use the search bar to look for "DIGSI 4.91" or "DIGSI 4 Update."
The Role and Evolution of Siemens DIGSI 4.91 in Power Systems