Years ago, people figured out Raspberry Pi’s can accidentally double as FM radio transmitters without a need for any radio front-end (if we don’t count a single jumper wire working as an antenna). They achieved this by tying a GPIO pin to a software-controlled clock around 100 MHz to modulate audio. This created a low-powered FM radio transmitter. Due to the pin producing a square wave instead of a neat sine wave, it also emitted weaker harmonics at 300MHz, 500MHz, etc., but any basic FM radio could pick up the audio. I wondered if a similar feat could be achieved by much less powerful Raspberry Pi Pico microcontrollers.
Фото: Константин Михальчевский / РИА Новости
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Советники Трампа попытались поменять его мнение об операции в ИранеCNN: Советники пытаются убедить Трампа скорее объявить победу над Ираном。关于这个话题，谷歌浏览器【最新下载地址】提供了深入分析
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