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I am using Arduino mega and a sensor shield (picture attached below). I need to connect three different wires to 3.3 V input. Can anybody suggest how can I achieve the same? What voltage do the VCC pins of all digital and analog pins on the sensor shield have?

enter image description here

  • Is there a pin marked with 3.3 or similar? If not, you will need an external voltage regulator. If yes, you should make sure, that is can provide enough current for the sensors – chrisl Apr 21 at 11:20
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They are all 5V as the Mega2560 uses 5 V logic. However, there is a 3V3 pin at the bottom, second pin from the left, that you could use:

Mega sensor shield

However, unfortunately, the pin isn't protruding above the shield, so you'll have to make an ugly solder link to the top of the pin. Either that, or remove the row of pins and replace with a female header (carefully avoiding the SD card pins):

Female header pins


As an aside, the Iteaduino MEGA 2560 works at 3V3 but unfortunately the Mega shield that you have won't fit it.

Iteaduino MEGA 2560

The Uno equivalent of your shield will fit it though:

Uno sensor shield

  • @Nimish Mishra don't forget to upvote, please :-) – Greenonline Apr 23 at 12:43

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