How To wire a 5-pin metal push button with an LED

To wire a 5-pin metal push button with an LED, begin by identifying the button's pin configuration: typically, two pairs of normally open (NO) and normally closed (NC) contacts, plus a common pin. First, connect the common pin to a 3.3V or 5V power source (VCC) using a 220Ω current-limiting resistor—this protects the LED from overcurrent.

Next, attach the anode (long leg) of the LED to one terminal of the NO contact pair. Connect the cathode (short leg) of the LED to the ground (GND) to complete the circuit path when the button is pressed. For stability, add a 10kΩ pull-down resistor between the NO contact and GND; this ensures a clean logic state when the button is inactive.

If utilizing the NC contacts, wire them in parallel with the NO configuration to create a toggle function, though this is optional. Secure all connections with soldering or terminal blocks to prevent loose contacts, critical for reliable operation in industrial or high-vibration environments.

Finally, test the assembly by pressing the button— the LED should illuminate instantly, confirming proper continuity. For microcontroller integration, connect the NO contact to a digital input pin, allowing software to detect button states and control additional peripherals as needed. This wiring scheme balances functionality and safety, suitable for applications ranging from control panels to interactive devices.