• SDA (Serial Data Line): Typically corresponds to GPIO21 (but any available GPIO can be configured).
• SCL (Serial Clock Line): Typically corresponds to GPIO22 (but any available GPIO can also be configured).

• GPIO1, GPIO2 are common choices for I2C.
• GPIO36 can be used as a branch point.
• GPIO21 for SDA (since it is typically configured as such).

Cpp
#include <Wire.h>

#define SDA_PIN 21  // Change as per your choice
#define SCL_PIN 22  // Change as per your choice

void setup() {
  Wire.begin(SDA_PIN, SCL_PIN);
}

void loop() {
  // Your code here
}

• SDA Example: Connect GPIO21 to SDA.
• SCL Example: Connect GPIO22 to SCL.