How to Use Double Pole 2POS rotory switch: Examples, Pinouts, and Specs

The Double Pole 2POS Rotary Switch (MRT22) by NKK Switches is a versatile component designed to control two separate circuits simultaneously. With its two-position functionality, it can be used for on/off operations or other switching functions. This rotary switch is commonly used in various applications, including audio equipment, industrial machinery, and control panels.

1. Identify the Pins: Refer to the pin configuration table to identify the common and position pins for each pole.
2. Connect the Common Pins: Connect the common pins (Pin 1 for Pole 1 and Pin 4 for Pole 2) to the input voltage or signal source.
3. Connect the Position Pins: Connect the position pins (Pins 2 and 3 for Pole 1, Pins 5 and 6 for Pole 2) to the respective output circuits.
4. Mount the Switch: Securely mount the rotary switch on your control panel or circuit board.

• Voltage and Current Ratings: Ensure that the voltage and current ratings of the switch are not exceeded to prevent damage.
• Debouncing: Implement debouncing techniques in your circuit to avoid false triggering due to mechanical bounce.
• Secure Connections: Make sure all connections are secure to avoid intermittent contact issues.
• Environmental Conditions: Consider the operating temperature range and ensure the switch is used within specified limits.

To demonstrate the use of the MRT22 rotary switch with an Arduino UNO, we will create a simple circuit to read the switch positions and display the status on the serial monitor.

Arduino UNO       MRT22 Rotary Switch
-----------       -------------------
  5V   ----------- Pin 1 (Pole 1 Common)
  GND  ----------- Pin 4 (Pole 2 Common)
  D2   ----------- Pin 2 (Pole 1 Position 1)
  D3   ----------- Pin 3 (Pole 1 Position 2)
  D4   ----------- Pin 5 (Pole 2 Position 1)
  D5   ----------- Pin 6 (Pole 2 Position 2)

// Define pin connections
const int pole1Pos1 = 2;
const int pole1Pos2 = 3;
const int pole2Pos1 = 4;
const int pole2Pos2 = 5;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);

  // Set pin modes
  pinMode(pole1Pos1, INPUT);
  pinMode(pole1Pos2, INPUT);
  pinMode(pole2Pos1, INPUT);
  pinMode(pole2Pos2, INPUT);
}

void loop() {
  // Read switch positions
  int pole1Pos1State = digitalRead(pole1Pos1);
  int pole1Pos2State = digitalRead(pole1Pos2);
  int pole2Pos1State = digitalRead(pole2Pos1);
  int pole2Pos2State = digitalRead(pole2Pos2);

  // Display switch positions on serial monitor
  Serial.print("Pole 1 Position 1: ");
  Serial.println(pole1Pos1State);
  Serial.print("Pole 1 Position 2: ");
  Serial.println(pole1Pos2State);
  Serial.print("Pole 2 Position 1: ");
  Serial.println(pole2Pos1State);
  Serial.print("Pole 2 Position 2: ");
  Serial.println(pole2Pos2State);

  // Add a small delay to avoid flooding the serial monitor
  delay(500);
}

1. Intermittent Contact: Loose connections can cause intermittent contact. Ensure all connections are secure.
2. Incorrect Position Readings: Mechanical bounce can cause incorrect readings. Implement debouncing techniques in your circuit or code.
3. Overheating: Exceeding the voltage or current ratings can cause the switch to overheat. Always operate within specified limits.

• Check Connections: Verify that all connections are secure and correctly wired according to the pin configuration.
• Debounce: Use hardware or software debouncing techniques to filter out noise caused by mechanical bounce.
• Verify Ratings: Ensure that the voltage and current ratings are not exceeded to prevent damage to the switch.

Q: Can the MRT22 switch be used for DC applications? A: Yes, the MRT22 switch can be used for both AC and DC applications, provided the voltage and current ratings are not exceeded.

Q: How do I implement debouncing in my circuit? A: Debouncing can be implemented using hardware (e.g., capacitors and resistors) or software (e.g., delay functions in code) techniques.

Q: What is the maximum operating temperature for the MRT22 switch? A: The maximum operating temperature for the MRT22 switch is +85°C.

This documentation provides a comprehensive guide to the Double Pole 2POS Rotary Switch (MRT22) by NKK Switches. Whether you are a beginner or an experienced user, this guide will help you understand, use, and troubleshoot this versatile component effectively.