A low-power small clock based on the Renesas RA chip. The external circuit includes an rtc clock chip, a temperature and humidity sensor, a battery charge and discharge chip, etc. I forgot to buy an rtc chip when I bought the device. I used the rtc function of the MCU, and the OLED is SPI. For communication, the spacing of the holes was not grasped well, so the only way to connect was with DuPont wire.
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