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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.
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2026年被称为AI手机普及元年，IDC数据显示，中国AI手机出货量将达1.47亿台，占整体市场53%，几乎所有手机厂商都喊出All in AI的口号。，这一点在夫子中也有详细论述
A powerful laptop doesn’t have to cost over a grand. The Grade A refurbished HP OmniBook X 14” Touch (2024) is down to $649.99 (reg. $1,399) — delivering modern performance, long battery life, and a premium feel at 53% off.，这一点在下载安装汽水音乐中也有详细论述
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