Arduino Pro (5V) In-built pull-up resistors

Development Boards Arduino
1

Can someone please advise if pull-up resistors are inbuilt on all digital pins on the Arduino Pro (5V version), and therefore programmable. Thank you.

2

Hello, and thanks for your post!

The [Arduino Pro board itself doesn’t have any hardware pullup resistors on the board, but you can enable the internal pullup resistors built into the ATmega328 micro controller on the board with a simple command.

Have a look at the Arduino [reference for digital pins and look for the INPUT_PULLUP section. That should get you going.

The command:

  • pinMode(x, INPUT_PULLUP);

    • where ‘x’ is the pin number you want to have a pullup on, in your code should get you the results you’re looking for. :-)](https://www.arduino.cc/en/Tutorial/DigitalPins)](https://www.sparkfun.com/products/10915)

    3

    Thank you. Solves my problem.