14mm Reed Switch NO NC 3 Pin

A reed switch is a type of electromechanical device that is primarily used for controlling low voltage and current circuits. This device is made up of two flexible reeds, which are essentially metal strips composed of ferromagnetic material, housed inside a glass tube. The function of a reed switch is to open or close the contacts in response to an external magnetic field.

Key Features

• Magnetic Interaction: The reed switch operates through the interaction with magnetic fields. The metal strips inside the switch come into contact and close the circuit when a magnetic field is applied. Conversely, the circuit opens when the magnetic field is removed.
• Types: Reed switches come in several types, including Normally Open (NO), Normally Closed (NC), and Changeover (SPDT). In an NO type, the circuit closes when a magnetic field is applied; in an NC type, the circuit opens when a magnetic field is applied.
• Durability: The glass tube serves as a protective shield for the metal strips against environmental factors, thereby enhancing the switch's durability and reliability.
• Compact Size: The reed switch's small and lightweight design makes it suitable for a wide range of electronic and mechanical systems.

Technical Specifications

• Operating Voltage and Current: Reed switches are typically used in low voltage and current applications, often operating at 5V-12V DC and handling currents from 0.5A to 2A.
• Operating Temperature: Reed switches can function across a broad temperature range, typically from -40°C to 125°C.
• Response Time: Reed switches have a fast response time, usually in milliseconds.

Applications

• Sensor Systems: Reed switches are used in door and window alarm sensors, bicycle speedometers, and for detecting the presence or absence of a magnetic field.
• Electronic Devices: Reed switches are employed in computer keyboards, household appliances, medical devices, and various electronic gadgets.
• Automotive Industry: Reed switches are used to detect the position of doors, seat belts, and other movable parts in vehicles.
• Industrial Automation: Reed switches are utilized for position and movement detection in industrial machines and equipment.

Advantages

• Electrical Isolation: The glass tube isolates the contacts from environmental factors, ensuring high reliability.
• Low Power Consumption: Reed switches operate with low power due to their magnetic operation.
• Long Lifespan: Reed switches have minimal wear and tear since there are no mechanical contacts, leading to a long operational life.
• High-Speed Switching: Reed switches respond within milliseconds, making them suitable for applications requiring quick switching.

Disadvantages

• Magnetic Interference: Reed switches can be affected by nearby magnetic fields, causing unwanted switching.
• Fragility: The glass tube can be fragile and prone to damage from physical impact.
• Limited Current Capacity: Reed switches are not suitable for high current applications.

Example Connection

You can use a reed switch with an Arduino to create a simple circuit, such as turning on an LED when the reed switch is activated:

int reedPin = 2; // Pin connected to the reed switch
int ledPin = 13; // Pin connected to the LEDvoid setup() {
pinMode(reedPin, INPUT);
pinMode(ledPin, OUTPUT);
}void loop() {
int reedState = digitalRead(reedPin); // Read the state of the reed switchif (reedState == HIGH) {
digitalWrite(ledPin, HIGH); // Turn on the LED
} else {
digitalWrite(ledPin, LOW); // Turn off the LED
}
}
 

In conclusion, a reed switch is a versatile and reliable switching device that operates using a magnetic field. It is ideal for low voltage and current applications and is widely used in sensor systems, electronic devices, the automotive industry, and industrial automation. Despite its susceptibility to magnetic interference and unsuitability for high current applications, its advantages such as low power consumption, high reliability, and a long lifespan make it a valuable component in many applications.