BinKey

white-push-switch-momentary-spdt-led

6 min read

Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

White Push Switch Momentary SPDT PCB Pins LED Mount

Overview

White momentary push button switch with SPDT (Single Pole Double Throw) contacts and integrated LED mounting capability. This switch combines user input functionality with visual feedback through an integrated LED mount, making it ideal for control panels and user interfaces where both switching and indication are required.

Location

Cabinet-5, Bin 23, Section A - Push Button Switches

Images

White Push Switch Momentary SPDT LED Mount

Specifications

Physical Specifications

  • Button Color: White actuator cap
  • Body: Black plastic housing
  • Mounting: PCB pin mounting
  • LED Mount: Integrated LED mounting capability
  • Contact Type: SPDT (Single Pole Double Throw)
  • Operation: Momentary (spring return)
  • Actuator: Round white push button

Electrical Specifications

  • Contact Configuration: SPDT - 1 common, 1 NO, 1 NC
  • Voltage Rating: 12V DC (typical)
  • Current Rating: 100mA (typical)
  • Power Rating: 1.2W maximum
  • Contact Resistance: <100mΩ
  • Insulation Resistance: >100MΩ
  • Operating Temperature: -20°C to +70°C

Mechanical Specifications

  • Operating Force: 200-400gf (typical)
  • Travel Distance: 1-2mm (typical)
  • Life Expectancy: 50,000+ operations
  • Bounce Time: <10ms (typical)
  • LED Compatibility: Standard 3mm or 5mm LEDs

Pin Configuration

SPDT Contact Layout

The switch has SPDT contacts with the following configuration:

Common (C) ---- Normally Open (NO)
     |
     +--------- Normally Closed (NC)

Pin Functions

  • Common (C): Main switching contact
  • Normally Open (NO): Closed when button is pressed
  • Normally Closed (NC): Open when button is pressed
  • LED Pins: Separate pins for LED connection (+ and -)

Typical Wiring

  • Momentary High: Connect signal to NO, common to input
  • Momentary Low: Connect signal to NC, common to input
  • LED: Connect LED between LED pins with appropriate current limiting resistor

Applications

Control Panels

  • Start/Stop Buttons: Machine control with status indication
  • Mode Selection: Function switching with LED feedback
  • Emergency Controls: Safety switches with visual confirmation
  • User Interfaces: Interactive controls with status display

Electronic Projects

  • Arduino Controls: Digital input with LED status indication
  • Raspberry Pi Interfaces: GPIO input with visual feedback
  • Microcontroller Projects: User input with integrated indication
  • Automation Systems: Control switches with status LEDs

Industrial Applications

  • Machine Controls: Operator interface switches
  • Process Control: Manual override switches with indication
  • Safety Systems: Emergency stop switches with LED status
  • Test Equipment: Manual control switches with visual feedback

Consumer Electronics

  • Audio Equipment: Function switches with LED indicators
  • Gaming Controllers: Action buttons with illumination
  • Appliance Controls: User interface switches
  • Automotive: Dashboard switches with LED indication

Circuit Examples

Basic SPDT Switch (Arduino)

const int switchCommon = 2;
const int switchNO = 3;
const int ledPin = 13;
 
void setup() {
  pinMode(switchCommon, INPUT_PULLUP);
  pinMode(switchNO, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}
 
void loop() {
  // Read switch state (pressed when NO is connected to Common)
  bool switchPressed = (digitalRead(switchCommon) == digitalRead(switchNO));
  
  if (switchPressed) {
    digitalWrite(ledPin, HIGH);
    Serial.println("Switch pressed!");
  } else {
    digitalWrite(ledPin, LOW);
  }
  
  delay(50);
}

LED Integrated Switch

const int switchPin = 2;
const int switchLED = 3;  // PWM pin for LED brightness control
 
void setup() {
  pinMode(switchPin, INPUT_PULLUP);
  pinMode(switchLED, OUTPUT);
}
 
void loop() {
  if (digitalRead(switchPin) == LOW) {
    // Switch pressed - full brightness
    analogWrite(switchLED, 255);
  } else {
    // Switch not pressed - dim indication
    analogWrite(switchLED, 50);
  }
}

Debounced Switch with LED Status

const int switchPin = 2;
const int ledPin = 3;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;
bool switchState = false;
bool lastSwitchReading = false;
bool ledState = false;
 
void setup() {
  pinMode(switchPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
}
 
void loop() {
  bool reading = !digitalRead(switchPin);  // Invert for active high logic
  
  if (reading != lastSwitchReading) {
    lastDebounceTime = millis();
  }
  
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != switchState) {
      switchState = reading;
      
      if (switchState) {
        ledState = !ledState;  // Toggle LED on each press
        digitalWrite(ledPin, ledState);
      }
    }
  }
  
  lastSwitchReading = reading;
}

LED Integration

LED Mounting

  • LED Size: Compatible with 3mm or 5mm LEDs
  • Mounting: LED fits into integrated mount in switch body
  • Wiring: Separate LED pins for power connection
  • Current Limiting: Requires appropriate resistor for LED protection

LED Circuit Design

VCC ----[Resistor]----[LED Anode]----[LED Cathode]----GND
                           |              |
                      LED Pin (+)    LED Pin (-)

Resistor Calculation

For 5V supply with standard LED (2V forward voltage, 20mA current):

  • Resistor = (5V - 2V) / 0.02A = 150Ω
  • Use standard 150Ω or 220Ω resistor

PCB Design Considerations

Footprint

  • Pin Spacing: Standard switch pin spacing
  • LED Pins: Additional pins for LED connection
  • Mounting: Through-hole PCB mounting
  • Clearance: Allow space for button actuation

Layout Guidelines

  • Pull-up Resistors: 10kΩ for digital inputs
  • Debounce Capacitors: 100nF across switch contacts
  • LED Current Limiting: Appropriate resistor values
  • ESD Protection: Consider protection diodes

Mechanical Considerations

  • Panel Cutout: Appropriate hole size for switch body
  • Actuator Access: Ensure button can be pressed fully
  • LED Visibility: Position for optimal light transmission
  • Mounting Security: Proper mechanical support

Installation

PCB Mounting

  1. Insert Switch: Place switch in PCB holes
  2. Solder Contacts: Solder all switch pins
  3. Install LED: Insert LED into switch mount
  4. Solder LED: Connect LED pins with current limiting resistor
  5. Test Operation: Verify both switching and LED function

Panel Integration

  1. Cut Opening: Create appropriate hole in panel
  2. Mount Switch: Secure switch in panel opening
  3. Wire Connections: Connect switch and LED circuits
  4. Test Function: Verify operation and LED illumination

Troubleshooting

Common Issues

  • No Switching: Check solder joints and connections
  • LED Not Working: Verify LED polarity and current limiting resistor
  • Intermittent Operation: Check for mechanical wear or contamination
  • LED Too Dim/Bright: Adjust current limiting resistor value

Testing Procedures

  • Continuity Test: Verify SPDT contact operation
  • LED Test: Check LED function with appropriate voltage/current
  • Mechanical Test: Verify smooth button operation
  • Electrical Test: Measure contact resistance and insulation

Sourcing Information

Supplier

Alternative Sources

  • DigiKey: Various manufacturers available
  • Mouser: Multiple options with LED integration
  • Amazon: Illuminated switch assortments
  • AliExpress: Low-cost alternatives

Specifications to Match

  • SPDT contact configuration
  • Momentary operation
  • LED mounting capability
  • PCB pin mounting
  • White actuator color

Storage and Handling

Storage Recommendations

  • Dry Environment: Prevent corrosion of contacts
  • Anti-Static: Use anti-static packaging if needed
  • Organization: Keep with other illuminated switches
  • Temperature: Room temperature storage

Handling Tips

  • Gentle Installation: Don’t force into PCB holes
  • LED Care: Handle LEDs carefully to avoid damage
  • Soldering: Use appropriate temperature and time
  • Testing: Test both switch and LED before final installation

Tags

switches, buttons, push-button, momentary, spdt, led-mount, white, illuminated, pcb-mount, control-panel cabinet-5 status-available

Notes

These white push switches with integrated LED mounts provide both switching functionality and visual feedback in a single component. The SPDT contact configuration offers flexibility in circuit design, while the LED mount enables status indication or user guidance. Store in Cabinet-5, Bin 23, Section A for easy access during control panel and user interface projects. The combination of switching and indication makes these switches ideal for applications where user feedback is important. Consider the LED current requirements when designing circuits to ensure proper operation and longevity.

Graph View

Backlinks