A DIYer has pieced together a railgun of 3D printed pieces and other parts. The 3D printed prototype made by the U.S Navy is considered legit.

Arduino UNO R4 WiFi specifications and features: Microprocessor: RA4M1 from Renesas and ESP32-S3 from Espressif for Wi-Fi and Bluetooth capabilities Voltage: 5V operating voltage – Extended 24 V ...

The Arduino UNO R4 boasts a 3x performance increase over the UNO R3 and , in addition, SRAM has been upgraded from 2kB to 32kB, and flash memory from 32kB to 256kB to support more complex projects.

Even with more and more devices making the leap to USB-C, the Arduino Uno still proudly sports a comparatively ancient Type-B port. It wouldn’t be a stretch to say that many Hackaday readers … ...

Arduino Uno - The World's Most ... Preserving the standard form factor, shield compatibility and 5 V power supply of the popular UNO R3, the UNO R4 adds a 32-bit microcontroller with up to 16x the ...

Arduino will continue to make available the Arduino UNO R3 and provide support to all those Arduino enthusiasts that have and would like to create projects using its 8-bit AVR microcontroller.

The Arduino Uno-compatible board has an MCS-51 (often called 8051 instead) instead of the usual ATmega328P/ATmega168. Specifically, [ElectroBoy] uses the AT89S52 .

In the press statement accompanying the launch, Massimo Banzi, co-founder and chairman at Arduino, said that the UNO R4 represents a new chapter to the UNO story, commenting, “With the ever-changing ...