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Button with ESP32

15-07-2025

🧠 What is a Push Button?

A push button is a simple mechanical switch that connects two points in a circuit when pressed.

Normally Open (NO): Most common type — the circuit is open (OFF) when the button is not pressed.
When pressed: The circuit closes, allowing current to flow.

🧾 Components Needed

ESP32 board
Push button
10kΩ resistor (for pull-down, optional if using internal pull-up)
Jumper wires
Breadboard

🔌 Wiring Push Button to ESP32

Option 1: Using Internal Pull-Up (Recommended)

Button Pin	ESP32
One leg	GND
Other leg	GPIO 14 (or any digital pin)

No resistor needed — we'll use the internal pull-up.

🧠 Working Logic (with pull-up):

Button not pressed: Pin reads HIGH (connected internally to 3.3V)
Button pressed: Pin reads LOW (connected to GND)

✅ Basic Code (Button with ESP32)

🟢 Optional: Control an LED with Button

#define BUTTON_PIN 14

#define LED_PIN 2 // Onboard LED (optional external)



void setup()

Serial.begin(115200);

  pinMode(BUTTON_PIN, INPUT_PULLUP);

  pinMode(LED_PIN, OUTPUT);

}

void loop()

if (digitalRead(BUTTON_PIN) == LOW)

    digitalWrite(LED_PIN, HIGH); // Turn on LED

}

else

digitalWrite(LED_PIN, LOW); // Turn off LED

}

USING Button.h Library

✅ `Button` library by J-M-L or others

These libraries are often named just Button.h, and are designed to simplify:

Debouncing
Single press
Long press
Multi-click detection

✅ Step-by-Step: Using `Button.h` Library with ESP32

📌 Note: Since Button.h is a generic name, I’ll assume you're referring to a standard Arduino button library that provides button.isPressed() or similar methods. If you meant a different specific library, let me know!

📚 Step 1: Install the Library

In Arduino IDE
Go to Sketch > Include Library > Manage Libraries
Search for Button
You may see something like:
- Button by J-M-L
- EasyButton
- OneButton (also common and good)