I've recently purchased an accelerometer (Adafruit ADXL345: https://thepihut.com/products/adafruit-adxl345-triple-axis-accelerometer-2g-4g-8g-16g-w-i2c-spi), and I'm working on connecting it up before coding.
Should I plug the Vin to the 3.3V or 5V output on my Arduino Uno?
On the Adafruit website it says: "For 3.3V LOGIC boards: connect 3.3V on the Arduino/Metro to VIN (red wire) on the ADXL343 For 5.0V LOGIC boards: Connect 5V on the Arduino/Metro to VIN (red wire) on the ADXL343" (Source: https://learn.adafruit.com/adxl345-digital-accelerometer/assembly-and-wiring)
As a complete noob, I don't even know if the logic board is referring to the Arduino itself? If it is, the Arduino Uno has both output options, so how do I choose?