Building an FM radio from $3 radio chip and an 84MHz ARM Arduino

Re:Building an FM radio from $3 radio chip and an 84MHz ARM ... by anaganisk on Sunday October 09, 2022 @05:37PM (#33145560)

Didn’t RPI have In built capability to do that? I built a cheap streaming system, back when bluetooth wasn’t so main stream to make “piplay” for my stereo in car with Pi2.

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Re:Building an FM radio from $3 radio chip and an 84MHz ARM ... by 9wzYQbTYsAIc on Sunday October 09, 2022 @05:51PM (#33145675)

I’m not sure, it might.

As I recall, some ARM SoC have FM radios in them.

edit: ah, it was the Qualcomm modems that I was recalling

https://www.wired.com/2016/07/phones-fm-chips-radio-smartpho...

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Re:Building an FM radio from $3 radio chip and an 84MHz ARM ... by bdowling on Sunday October 09, 2022 @06:30PM (#33145937)

Sort of. The Raspberry Pi CPU had a configurable clock generator that could output up to about 125MHz to a GPIO line. Some people figured out that it was possible to rapidly change the configuration registers to modulate an audio signal onto a carrier frequency in the FM broadcast range. [0] So you could make a low power FM transmitter using just a Raspberry Pi and a piece of wire.

[0] http://www.icrobotics.co.uk/wiki/index.php/Turning_the_Raspb...

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