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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进山那天，宜昌大雨。朝新和带路的果农便踩水前行，水深，鞋里很快就进了水，他们索性脱掉了鞋袜，赤脚蹚水前行。小雨中，褚朝新看到了花果同枝的“伦晚”！漫山遍野都是脐橙，除了“伦晚”，其他品种的果子早已摘完，只剩下满树的白色橙花，整个山里都弥漫着橙花香。。体育直播是该领域的重要参考
traits like Move and Forget: