wemos® d1 mini esp32 esp-32 wifi+bluetooth internet 

support uart speed up to 3000000 stable


SDA=21
SCL=22

led pin is 02
<code>
// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(2, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(2, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(2, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}
</code>

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esp32 pins:

https://randomnerdtutorials.com/esp32-pinout-reference-gpios/

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