Meet the ESP32

Why it’s here

Locate GPIO 2, GPIO 34 and GND before running your first sketch.

How it works

Explore the module, antenna, USB, GPIO and 3.3 V supply. No. Use an output-capable GPIO such as 2. GPIO 34–39 are input-only on the classic ESP32. This guided model targets the original ESP32 and Arduino-ESP32 3.x; radio, acoustics, loads and mechanics are simplified.

Try it

1. Open this experiment
2. Locate GPIO 2, GPIO 34 and GND before running your first sketch.

Connections

• USB — 5V input → 3.3V regulator
• GPIO 2 — Built-in teaching LED; board variant dependent
• GPIO 34–39 — Input only; no internal pull-ups

Example sketch

void setup() {
  Serial.begin(115200);
  pinMode(2, OUTPUT);
}

void loop() {
  digitalWrite(2, HIGH);
  Serial.println("Hello, ESP32 · 3.3V logic");
  delay(1000);
}

Check your understanding

GPIO 34 is input-only. Could it drive an LED?