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.
Lenovo Idea Tab Pro Gen 2 — A premium 13-inch tablet for students with a Snapdragon 8s Gen 4 chip, a 3.5K display, JBL speakers, and a detachable keyboard; ships in July at $419.，这一点在PDF资料中也有详细论述
，这一点在PDF资料中也有详细论述
loop = asyncio.get_running_loop()
GPT-5.4 的答案是 83.0%，意味着十次对比中有八次以上，行业专业人士认为 AI 的产出达到或超过了人类同行水准。上代 GPT-5.2 是 70.9%，差距将近 13 个百分点。，这一点在谷歌浏览器下载中也有详细论述
03:02, 5 марта 2026Из жизни