I was wondering that can the arduino receive FM radio with rda5807m and send the audio to the usb port as a microphone?
The USB port on an Arduino is usually limited to acting as a COM port through its hardware implementation. This is in any case true for the 'regular' Arduinos such as the Nano, Uno etc. There are microcontrollers that support using the USB port as an audio or HID device, but I'm not sure to what extent this is available/feasible on Arduino boards. Perhaps with something like the SAMD21 (MKRZero IIRC) it's within reach, but I have no experience with this.
It looks like the rda5807m board supports left & right audio out. You could get one of the cheap USB sound adapters like this one and wire up the audio L & R outputs to it. It might work but I don't know enough about the mic in levels to know for sure.
hi @kikihun ,
the output of the rda5807m module is an analog output.
You can use this project with arduino to control the RDA5807m
and use this adapter to "inject" the sound into the USB.
https://www.amazon.com/Sabrent-External-Adapter-Windows-AU-MMSA/dp/B00IRVQ0F8/ref=sr_1_1_sspa?dchild=1&keywords=usb+audio+adapter&qid=1624100195&sr=8-1-spons&Lapsc=1& ZW5jcnlwdGVkUXVhbGlmaWVyPUEyOUE3NzJXNE1XWVEwJmVuY3J5cHRlZElkPUEwNTE2MjQwM1BKUkwxOEJMNTU3QSZlbmNyeXB0ZWRBZElkPUEwMjU4Nzc0MzFLVVRQQklPUllKOCZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU =
RV mineirin
Hi, @kikihun
Welcome to the forum.
Please read the post at the start of any forum , entitled "How to use this Forum".
Can you please tell us your electronics, programming, arduino, hardware experience?
Thanks.. Tom.. 
In principle those modules have a high impedance mic input, but perhaps it can be software-configured as a line level input instead. I briefly used a module like that (but not for line level input), but quality was abysmal. Better spend twice the money for a slightly better device.
I learnt php, c#, html, js, java for 5 years in my school. So i can call it medium-high level.
Now i started playing with arduinos.
I made a pc rgb controller with desktop app already.
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