Kishima Craft Works

Kishima's projects

Japanese

Family mruby


Family mruby logo

What is Family mruby

In 80s, BASIC was one of the famous languages for children to learn programing at first. A computer for consumers has limited resource to run any programing language, however there are some other good machines like MSX, Family basic on Family Computer in Japan. I think many senior programmers learnt the fun of programming.

Today we can enjoy most of all programming language in free of charge. I think however it might be too complicated to begin the first step of learning programming language since it’s difficult to prepare proper condition to making what they want like a game application after a “Hello World”.

Then I decided to create a small computer that anybody can make a simple game with a script language. This is the “Family mruby”.

Family mruby is a stand-alone development environment based on an original PCB, which can edit and execute Ruby code with a VGA display and a PS/2 keyboard. You can enjoy Ruby programming without a PC to send code to the board.

(Remark: Now development of firmware is ongoing, PC is needed when you update the firmware.)

Family mruby has following properties.

Demonstration

Following video shows to edit Ruby code and execute it.

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How to use it?

Preparing…


Architecture

Family mruby architecture


Firmware

Latest release is v0.5 beta.

https://github.com/kishima/family_mruby


Narya Board

Family mruby is running on the Narya board.

I published a private technical book to explain how to design the board.

「ゼロから始めるmrubyデバイス作り」BOOTH web site

HW specification

# items explanation
1 Micro processor ESP32(ESP32-WROVER-B)
2 RAM Main SRAM(520KB) SPI-SRAM(8MB)
3 Power supply Using micro USB(1.5A is recommended)
4 External Strage Micro SD(developing)
5 Video output VGA(Supported resolution:TBD)
6 Key input PS/2 keyboard
7 Audio output mono-AUX(deloping)
8 Additional IO GROVE 3.3V-UART (developing)
9 WiFi See ESP32 spec

HW design

Schematics and gerber data is shared in the following github repository.

https://github.com/kishima/narya_board

Pin assignment

Pin assignment

v2.0 (Latest)

Build by Elecrow PCBA. Released on C97.

Changes

Narya board v2.0

Narya board v2.0 with a case

v1.4

Chanages

v1.3

Changes

v1.2

Released in Techbook Fest #7. Reference of 「ゼロから始めるmrubyデバイス作り」

Family mruby demo

v1.0

SFirst prototype. Some errors.

Family mruby demo