Introduction

This beginner blueprint reads a push button using an internal pull-up resistor (or optional external pull-up), debounces it, toggles the onboard LED on press, and publishes button state changes for observability.

Supported devices

Hardware and supplies

• Supported Particle device
• Push button (momentary)
• Jumper wires

Project description:

The button is wired between GPIO D2 and GND by default; INPUT_PULLUP makes the logic active-LOW. A software debounce confirms stable transitions. On press, the firmware toggles the LED and publishes led_state; on any change, it publishes button_state with "PRESSED" or "RELEASED".