I bought an Arduino Nano ble 33 but when I try to power my MQ-4 and MQ-8 sensors, these don't turn on at all, they do turn on if I switch to the 3.3V tho.

Is there anything special that I need to do to be able to use the 5V pin, or my board is faulty?

enter image description here

P.S: When I say 5V I mean the pin next to the green rectangle.

  • Did you set it up to use it? support.arduino.cc/hc/en-us/articles/… Commented Jul 1, 2021 at 18:21
  • I haven't made a solder bridge on the two pads, however I am powering the board through the USB port (please note that this is not the BLE Sense board)
    – human
    Commented Jul 1, 2021 at 18:23
  • Oh I have just seen that as an OR when it is actually and AND, so both conditions need to be met
    – human
    Commented Jul 1, 2021 at 18:25
  • Says there it needs to be bridged. Also stated on arduino.cc/en/Guide/NANO33BLE. Commented Jul 1, 2021 at 18:26
  • To be honest, I couldn't find any information on my google search, but you are right, it says so.
    – human
    Commented Jul 1, 2021 at 18:27

1 Answer 1


i think you solder the two pads but i'll tell you something: use the 3.3v pin

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