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From ur audio jack. You can select only one channel i.e. either left or right and another will be connected to common ground. You can google it about audio jack.

Surely you can. Nothing is impossible. but you will need more modules to fill the gap like wifi shield, etc as per ur requirement. But if you want to connect to the cloud also you will need to process the voice somewhere to make it detect as a command. So think about it

Try googling ur error or post in arduino forum.

Then you would need to use raspberry pi instead of a pc. Arduino itself isnt capable of doing anykind of voice or image processing itself.

can i connect the audio jack directly instead of using the mic? i mean even if i connect the audio directly do i need to amplify or cn i feed it directly into the microcontroller?

I want to use 5050 RGB led strip but instead of TIP120 can i use a2shb mosfet which i got inside 24key IR Comtroller? plz rely asap.

I want to use 5050 RGB led strip but instead of BUZ11 N Channel MOSFET can i use a2shb mosfet which i got inside 24key IR Comtroller? plz rely asap.

You mentioned about 4 motors but in schematic you shown 5. why 2 motors in z-axis?

I think u jst need to figure out the pin confic as pro mini n uno uses same 328P

i dont think he supplied power from arduino. see is ckt diagrm. he used external source. probably smps

use a smps

Can i use same cone and library for 125MHz RFID Module? Or in RC522 RFID Module can i use 125MHz card?