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.
Что думаешь? Оцени!
。业内人士推荐体育直播作为进阶阅读
Language & RealityDec 2025
thenewregion.com，更多细节参见体育直播
ВсеГосэкономикаБизнесРынкиКапиталСоциальная сфераАвтоНедвижимостьГородская средаКлимат и экологияДеловой климат
FT Edit: Access on iOS and web。关于这个话题，搜狗输入法2026提供了深入分析