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Can I use Using Earphones/Headphones with a mic to give voice commands in DIY Alexa on raspberryPi zero/3b/3b+ by connecting the 3.5mm male jack to the board via a USB type c/ micro USB adapter as the 3.5mm jack is only for audio OUT?

Can I use Bluetooth speakers to receive the audio while giving input via a USB mic/mic array

Is it possible to do so?

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Yes you can connect an analog 3.5mm mic via a USB sound card to your Raspberry Pi.

And Yes you can use a Bluetooth speaker to play sound from a Raspberry Pi.

Ref.:

GUI method: https://www.raspberrypi.org/magpi/bluetooth-audio-raspberry-pi-3/

CLI method: https://pacmans-revenge.blogspot.com/2018/08/raspberry-pi-bluetooth-speakers.html

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