To fix this, I moved to Unicode Block Elements. Block elements are a (weirdly incomplete) set of blocky unicode characters like UPPER_HALF_BLOCK (▀), LOWER_HALF_BLOCK (▄), and FULL_BLOCK (█) 1.
One of the pins is programmed to produce a constant 1000 KHz square wave using PIO. The main program then turns the PIO on and off at the intended frequency. e.g. to emit an A4 pitch (440 Hz), it turns the 1000 KHz square wave on and off 440 times a second. To the radio receiver, this means a 440 Hz square wave audio. Using this technique, it emits the well-known Shave and A Haircut melody on a loop.
14:52, 4 марта 2026Мир，推荐阅读下载安装汽水音乐获取更多信息
Using recovery.，更多细节参见PDF资料
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FT Videos & Podcasts，这一点在爱思助手下载最新版本中也有详细论述