Read whether a button is pressed
Prints D2's state to the serial monitor as 0 or 1, over and over.
button
Input
Tactile switch (SMD)
buttonGPIO
Why this support circuit is added
Push button (pulls to GND).
Grounded in the catalog and golden patterns (real open-source circuits). Every auto-inserted part comes with a reason.
Support circuit added automatically1
Using this part in a project adds the circuit below, each element with its reason.
Pull-up resistor
1 → VCC
Pull-up so the input is defined while the button is open.
InterfaceGPIO
- Catalog id
- button
- Category
- Input
- Protocol
- GPIO
- Logic level
- Unrestricted (uses the board rail)
Firmware detection0
No library reveals it — add it from the module checklist in your project.
Examples using this part
Run them in the browser, no login needed.
Turn an LED on while a button is held
D13 lights only while the button is pressed.
buttonled
Use the built-in pull-up
Reads a button with INPUT_PULLUP and no external resistor — pressed reads 0.
buttonled
Debounce a button
A button bounces on contact; waiting 50 ms turns the noise into one press.
buttonled
🔒
Count button presses
Detects the moment a button goes down, not whether it is down.
buttonled
🔒
Keep going while a button is held
Stays inside the while-loop for as long as the button is down.
buttonledpot
🔒
A pull-up button and an LED
D13 lights up while the button is held. Start here.
buttonled
Button counter
Every press adds one, shown on a four-digit seven-segment display.
buttontm1637
🔒
A doorbell that rings when pressed
Pressing the button turns the NeoPixel ring blue and plays two tones.
buttonbuzzerws2812b
A greenhouse controller
The relay closes when the DS18B20 passes 28 °C; an ultrasonic sensor measures distance too.
buttonds18b20hc_sr04ledrelay_1chssd1306_i2c