How to Use Green Button: Examples, Pinouts, and Specs

The Green Button is a user interface component that is widely used in electronic projects to trigger actions or confirm selections. It is a momentary push-button switch that is often illuminated with a green LED to indicate an active or 'go' state. This button is commonly found in applications such as control panels, user input devices, and interactive projects.

• Starting or stopping a process
• User input for interactive projects
• Confirmation of selections in a menu
• Initiating a sequence of events in a circuit

• Voltage Rating: 3.3V to 5V
• Current Rating: 20mA (LED), 10mA (Switch)
• Power Rating: 100mW (LED), 0.5W (Switch)
• Contact Type: Normally Open (NO)
• Switch Bounce Time: <10ms
• LED Color: Green
• Operating Temperature: -10°C to 50°C

1. LED Connection:

   • Connect the LED anode (Pin 1) to a digital output pin on your microcontroller.
   • Connect the LED cathode (Pin 2) to ground through a current-limiting resistor (typically 220Ω for 5V operation).

2. Switch Connection:

   • Connect one switch contact (Pin 3) to an input pin on your microcontroller.
   • Connect the other switch contact (Pin 4) to ground.
   • Enable the internal pull-up resistor on the microcontroller's input pin to detect the button press.

• Always use a current-limiting resistor with the LED to prevent damage.
• Debounce the button input either through hardware (e.g., a capacitor) or software to avoid false triggering.
• Ensure the voltage rating of the button matches the voltage of your circuit to prevent damage.

// Define pin connections
const int buttonPin = 2; // Pin connected to button switch
const int ledPin = 13;   // Pin connected to LED anode

void setup() {
  pinMode(ledPin, OUTPUT);      // Set LED pin as output
  pinMode(buttonPin, INPUT_PULLUP); // Set button pin as input with internal pull-up

  digitalWrite(ledPin, LOW);    // Turn off LED initially
}

void loop() {
  // Check if button is pressed (logic LOW when pressed due to pull-up)
  if (digitalRead(buttonPin) == LOW) {
    digitalWrite(ledPin, HIGH); // Turn on LED
  } else {
    digitalWrite(ledPin, LOW);  // Turn off LED
  }
}

• LED not lighting up: Check the LED polarity and ensure the current-limiting resistor is correctly placed.
• Button not responding: Verify the button is correctly wired and the input pin is configured with a pull-up resistor.
• Unstable button state: Implement software debouncing or add a hardware debounce circuit.

• Double-check all connections against the pin configuration table.
• Use a multimeter to ensure there is continuity in the button circuit when pressed.
• Replace the current-limiting resistor if the LED is too dim or not lighting up.

Q: Can I use the Green Button with a 3.3V system? A: Yes, the Green Button can operate at 3.3V, but ensure to adjust the current-limiting resistor for the LED accordingly.

Q: How do I debounce the button in software? A: Implement a delay after detecting a button press or use a library that handles debouncing.

Q: Is it necessary to use a pull-up resistor with the button? A: If your microcontroller has an internal pull-up resistor, you can use that instead of an external one. Otherwise, an external pull-up resistor is necessary.

Remember to keep your documentation up-to-date with any changes to the component or its usage. This ensures that users always have the latest information for their projects.