This is a project running on Arduino UNO/Nano.
The first version (V0.1.0) of this project was released on Oct. 24, 2020
It's a Morse code listening practice device to play Morse code by a passive buzzer and controlled by a infrared remote controller.
Detailed introduction (PDF, in Japanese) (PDF, 日本語)
The hardware is mainly constructed with the following parts:
An Arduino UNO
An LCD display 1602A
An IR Receiver 1838
A passive buzzer
An LED
A diode 1N4148
Some resistors, etc.
Circuit diagram
The morse code here is stipulated by the Japanese law [無線局運用規則 別表第一号 モールス符号（第十二条関係）]
(https://www.tele.soumu.go.jp/horei/reiki_honbun/72393000001.html)
But the Wabun code is not supported.