I would like to know if it's possible to power up arduino by VIN pin (say 9v) and use 5v output pin to connect to a sensor.

Many thanks

  • Yes. It is. That's why it's called VIN. Voltage INput. – Majenko Mar 13 at 0:25
  • 1
    depends on how much current is required by the sensor to function correctly – jsotola Mar 13 at 1:17
  • Hello. Thanks for the replay! The sensor works with 5V but the manufacture says "External power supply (7~12V) is necessary to supply the microcontroller board when you using this CO2 sensor module." – Leonel Gonçalves Mar 19 at 2:11

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