1. Connect the Positive Terminal of your adapter (typically +5V) to $5V$:1.
2. Connect the Negative Terminal of your adapter (GND) to $GND$:1.

• Step 1: Verify your adapter's output is 5V.
• Step 2: Using a suitable connector or soldering, link the positive output of your adapter to the $5V$:1 pin on your XIAO RP2040.
• Step 3: Connect the GND output of your adapter to the $GND$:1 pin on the XIAO RP2040.

Adapter +5V ----> $5V$:1
Adapter GND ----> $GND$:1

1. The adapter provides a stable 5V output.
2. The current rating of the adapter is sufficient to power the XIAO RP2040 and any peripherals connected to it.

• Connect one side of the button to P26_A0_D0.
• Connect the other side of the button to the ground (GND). This way, when the button is pressed, P26_A0_D0 will be pulled to ground.

1. Configure P26_A0_D0 as an input with a pull-up resistor.
2. Continuously check the state of P26_A0_D0 in your main loop. When the button is pressed, the pin state will change from high to low (because it's pulled to ground).
3. When a change in state is detected, trigger the function to change the display template on your round display.

C
setup() {
    pinMode(P26_A0_D0, INPUT_PULLUP); // Set pin as input with pull-up
}

loop() {
    if(digitalRead(P26_A0_D0) == LOW) { // Button press detected
        changeDisplayTemplate(); // Function to change display template
        delay(200); // Debounce delay
    }
}

• Make sure to debounce the button either in hardware (using capacitors) or software (as shown in the example with a simple delay) to avoid multiple detections for a single press.
• The function changeDisplayTemplate(); should contain the logic for changing the display template on the round display. This will depend on how you've set up the display and how templates are managed.