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.
未成年人普遍接触互联网已是共识。2024年世界互联网大会发布的《第六次中国未成年人互联网使用情况调查报告》显示，未成年网民规模已达1.96亿，互联网普及率97.3%。，详情可参考safew官方版本下载
。纸飞机下载对此有专业解读
For multiple readers，更多细节参见PDF资料
This change is necessary because module blocks are a potential ECMAScript proposal that would conflict with the legacy TypeScript syntax.