Some basic questions about the Arduino UNO

[Wrichik Basu]

https://learn.adafruit.com/ladyadas-learn-arduino-lesson-number-0/power-jack-and-supply

The arudino has a barrel jack that is commonly used for power. You can use any dc power source to power it (recommended in the 9-12 V range, although it can be 5-20 I think)

Yes, I was thinking of using that. It's always better to provide the recommended voltage, because I found (on some site) that if the voltage is below 9V, then the board may not be able to supply the 5V output, while that more than 13V or 14V might damage the components. Hence I decided on the 12 V adapter.

 

[Wrichik Basu]

make sure the barrel jack is the correct size,

you can also use a battery and buy or make a battery connector that has a barrel jack

The jack size is the preset size that is generally available for lower DC voltages.

I could use a battery as well, but when I found that I had an option of access to the mains in the exhibition, I decided to rely on the mains. School has power backup, so it's reliable too.