【Internet of Things competition OLED screen arrow option switch】

1. Realize the effect

Second, the subject requirements

① After power on, the first screen will display the following information:

② The < symbol can be moved up and down, when KEY2 is pressed, it is moved up, and when KEY3 is pressed, it is
moved down
③ The above steps can be repeated.

3. Code implementation and attention points

1. Display the initial boundary