Lesson 1 of 5

Blink an LED on GPIO23

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// The DevKitC has no user LED: wire one to GPIO23 const int LED_PIN = 23; void setup() { Serial.begin(115200); pinMode(LED_PIN, OUTPUT); Serial.println("Blink on GPIO23"); } void loop() { digitalWrite(LED_PIN, HIGH); delay(500); digitalWrite(LED_PIN, LOW); delay(500); }

Stopped · Your code isn't running yet. Until you press Run, the board runs the program already on it.

Nothing printed yet. Press Run.

The DevKitC has no LED you can program, so the first job is wiring one: GPIO23, a 220 Ω resistor, a red LED and back to GND.

A real ESP32 pin with its 3.3 V logic level
No LED_BUILTIN: the pin is named in your code
EN restarts the sketch, just like the real board

Pin	Connects to	What it does
`GPIO23`	220 Ω resistor, then the LED's anode	Output that switches the LED
`GND`	LED cathode	Return path

Wire it in

Sensors and actuators this board drives, with the real connections.

All 8 parts on the ESP32-DevKitC V4 page

Blink an LED on GPIO23

Try it yourself

Serial monitor

Checks

Break it

Parameters

Wire it in

Blink an LED on GPIO23

Try it yourself

Serial monitor

Checks

Break it

Parameters

Wire it in