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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Lovell read from the Book of Genesis, the basis of many of the world's great religions, to the people of the Earth.，推荐阅读快连下载安装获取更多信息
Популярность красной икры в России объяснили08:48
Helmed by Polish filmmaker Jan Komasa, Heel has plot points in common with Pedro Almodóvar's disturbing psychological thriller The Skin I Live In, with the comedic cheek of a midnight movie. The result is something gnarly, but not quite great.