This work is based on M5Paper. It uses the WiFi networking function of ESP32 to obtain the old almanac data from the network service, and performs screen display processing based on the old almanac data, thus presenting a classic old almanac. The interface of the classic old almanac is relatively complex and cumbersome. In order to facilitate the display and adjustment of the interface, a set of specifications for drawing interface elements using the json data format is defined. Dynamic json data is provided to M5Paper through the network service, so that the definition in the json data can be modified, and the classic old almanac interface on M5Paper can be updated. At the same time, the scroll wheel on M5Paper is used to facilitate users to view the old almanac forward or backward, and refresh the current classic old almanac interface.
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