The GR-CITRUS tiny board enables easier programming with the Ruby language. You can create Ruby programs with Visual Studio Code. See VSCode Extension "Rubic". You can also develop with Rubic on the chrome app. You can program similar to Arduino Sketch using the Renesas web compiler and IDE for GR. By connecting with the WA-MIKAN board that has an ESP8266 module for Wi-Fi, you can prototype a syst