A set of two OLED displays with a 1.3” screen size. Very small but should be good for some Arduino projects ... This makes OLED technology very efficient; also, the way these types of OLEDs are built ...

[hamblin.joe] wanted to do a simple project for kids along these lines, so whipped up a neat design using analog meters to display the time. The build relies on that old stalwart, the Arduino Uno ...

But what happens when you connect the VCC common anode of the board to one of the free digital pins of the Arduino? Setting the common anode digital pin to HIGH, we power on the entire display board ...